CN1703773B - Laminate body, method, and apparatus for manufacturing ultrathin substrate using the laminate body - Google Patents
Laminate body, method, and apparatus for manufacturing ultrathin substrate using the laminate body Download PDFInfo
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- CN1703773B CN1703773B CN03812196.4A CN03812196A CN1703773B CN 1703773 B CN1703773 B CN 1703773B CN 03812196 A CN03812196 A CN 03812196A CN 1703773 B CN1703773 B CN 1703773B
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Abstract
Provided is a laminated body comprising a substrate to be ground and a support, where the substrate is ground to a very small thickness and can then be separated from the support without damaging the substrate. One embodiment of the present invention is a laminated body comprising a substrate to be ground, a joining layer in contact with the substrate to be ground, a photothermal conversion layer comprising a light absorbing agent and a heat decomposable resin, and a light transmitting support. After grinding the substrate surface which is opposite that in contact with the joining layer, the laminated body is irradiated through the light transmitting layer and the photothermal conversion layer decomposes to separate the substrate and the light transmitting support.
Description
Technical field
The present invention relates to a kind of layered product, wherein be fixed in the substrate to be ground on the carrier,, can be separated from carrier at an easy rate, the invention still further relates to a kind of method and apparatus of making this layered product such as silicon chip, and the method and apparatus of making the wear down substrate.
Background technology
In various fields, all require to reduce substrate thickness usually.Such as, in the quartz field, thereby the thickness that requires to reduce quartz wafer improves frequency of oscillation.Particularly in semi-conductor industry, in order to reach thickness that reduces semiconductor packages and the purpose of carrying out the high density assembling by the chip lamination, continuous effort further reduces the thickness of semiconductor wafer.With comprise on the Butut circuit surface opposite surfaces, semiconductor wafer is carried out so-called grinding back surface reduces thickness.In the common technology of the grinding wafers back side or surface and transmission wafer; when only using a grinding back surface protective tapes fixed wafer; because it is in uneven thickness or have the problems such as wafer generation warpage of protective tapes to occur grinding wafers after grinding, in fact wafer thickness can only be reduced to about 150 microns (μ m).Such as, a kind of method is disclosed among Japanese unexamined patent publication (disclosing) 6-302569, wafer is fixed on the ring-shaped frame by the pressure sensing adhesive band in this method, grinds the chip back surface be fixed on the framework, and with wafer handling to next procedure.But this method can't significantly improve existing wafer thickness level, can not avoid simultaneously the appearance of above-mentioned inhomogeneous or warpage issues.
Also proposed wafer firmly to be fixed on the hard carrier, simultaneously the method for the grinding wafers back side and transmission wafer by adhesive.Its purpose is, by with this carrier supported wafer, prevent wafer grind overleaf with transport process in take place damaged.According to the method, can processed wafer to the thickness littler than said method, still, can not under the situation of not damaging wafer, separate ultra thin wafer from carrier, therefore, in fact can not be with the method for this method as the wear down semiconductor wafer.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of layered product, substrate wherein to be ground is fixed on the carrier, can peel off substrate to be ground from carrier at an easy rate.Purpose of the present invention comprises provides a kind of method of making this layered product, and uses this layered product to make the method and apparatus of ultrathin substrate.
In an example of the present invention, a kind of layered product is provided, this layered product comprises substrate to be ground; The adhesive layer that contacts with described substrate to be ground; But the photothermal transformation layer that contains optical absorbing agent and heat decomposable resin; With the printing opacity carrier.After the substrate surface opposite with the adhesive layer contact-making surface ground,, photothermal transformation layer is decomposed, substrate is separated with the printing opacity carrier by this layered product of photic zone irradiation.In this layered product, can under the situation of not damaging substrate, separate the substrate that is milled to very little thickness from carrier.
In another example of the present invention, a kind of method of making above-mentioned layered product is provided, and this method comprises: but but on the printing opacity carrier, apply and contain optical absorbing agent and heat decomposable resin solution or as the monomer of heat decomposable resin precursor material or the photothermal transformation layer precursor of oligomer; Dry solidification or curing photothermal transformation layer precursor form photothermal transformation layer on the printing opacity carrier; On substrate to be ground or photothermal transformation layer, apply adhesive, form adhesive layer; Under reduced pressure,, form layered product by bonding substrate to be ground of adhesive layer and photothermal transformation layer.
Under reduced pressure, by the bonding substrate to be ground of adhesive layer and printing opacity carrier, prevent from layered product, to form bubble and contamination by dust thing, just can after grinding, form horizontal surface and keep the uniformity of substrate thickness.
In another example of the present invention, a kind of equipment of making above-mentioned layered product is provided, in this equipment, the photothermal transformation layer that forms on the printing opacity carrier is being laminated on the substrate to be ground by adhesive layer under the reduced pressure, this equipment comprises (1) vacuum chamber, it can be depressurized to predetermined pressure, (2) be arranged in the strutting piece of this vacuum chamber, place (i) substrate to be ground or (ii) printing opacity carrier on the strutting piece, be formed with photothermal transformation layer on it, (3) be arranged in this vacuum chamber it can be on strutting piece top move in vertical direction fix/loosen device, can another substrate to be ground of clamping or be formed with the outer rim of the printing opacity carrier of photothermal transformation layer on it, when substrate to be ground and photothermal transformation layer very near the time, it can also be unclamped.
When using this equipment, because layered product makes under reduced pressure, thus can prevent from layered product, to form bubble and contamination by dust thing, and fix/loosen device and also can not damage and treat laminating surface.
In another example of the present invention, a kind of method that thickness reduces substrate of making is provided, this method comprises: prepare above-mentioned layered product, grind substrate to required thickness, by printing opacity carrier irradiation photothermal transformation layer photothermal transformation layer is decomposed, thereby after grinding from the printing opacity carrier separate substrates, after grinding from the substrate the release adhesive layer.In the method, can be on carrier with substrate grinding to required thickness (such as, 150 microns or littler, preferably 50 microns or littler, be more preferably 25 microns or littler), and after grinding,, so just can be at an easy rate after grinding, peel off and remain in on-chip adhesive layer from substrate by being exposed to radiant energy carrier of separating from the substrate.
In another example, the invention provides a kind of equipment that grinds substrate of making, this equipment comprises the mill that is applicable to the above-mentioned layered product substrate of grinding, to be described in more detail radiation energy hereinafter, it can provide sufficiently high radiant energy to described photothermal transformation layer by described printing opacity carrier, described photothermal transformation layer is decomposed, thereby after grinding, separate described substrate and described printing opacity carrier; And separator, be suitable for removing described adhesive layer from described substrate.
Description of drawings
Fig. 1 is the sectional view of the some examples of the present invention.
Fig. 2 is the sectional view that is applicable to vacuum bonding equipment of the present invention.
Fig. 3 is the partial cross section figure that is applicable to the milling apparatus of the inventive method.
Shown in Figure 4 is the operation of carrier of separating and release adhesive layer.
Fig. 5 is the sectional view that can be used for the layered product permanent plant of laser beam irradiation operation.
Fig. 6 is a kind of perspective view of laser irradiation equipment.
Fig. 7 is the schematic diagram that is used for the pick-up of separating wafer and carrier.
Shown in Figure 8 is the schematic diagram of release adhesive layer from the wafer how.
Fig. 9 is the schematic diagram that is used to measure the equipment of adhesive layer bonding strength.
Embodiment
An important structure feature of layered product of the present invention is between substrate to be ground and printing opacity carrier photothermal transformation layer to be set.When carrying out irradiation with radiant energy such as laser beams, photothermal transformation layer decomposes, thus can under the situation that does not cause any damage from the carrier separate substrates.Therefore, substrate thickness provided by the invention is that common method can't obtain.
Shown in Figure 1 is some examples of layered product of the present invention.In the layered product 1 of Fig. 1 (a), lamination substrate 2 to be ground, adhesive layer 3, photothermal transformation layer 4 and carrier 5 successively.And as shown in accompanying drawing 1 (b), adhesive layer 3 can be a tacky on two sides band 8, and this adhesive tape comprises first intermediate layer (film) 6, all has contact adhesive 7 on two surface.And as Fig. 1 (c) with (d), adhesive layer 3 can be a tacky on two sides band 8, and this adhesive tape and photothermal transformation layer 4 are combined into one.In addition, as shown in accompanying drawing 1 (e), adhesive layer 3 can be a tacky on two sides band 8, wherein photothermal transformation layer 4 itself comprise photothermal transformation layer 4 with pressure-sensitive-adhesive '.As shown in Fig. 1 (f), also have first intermediate layer 6 is set between adhesive layer 3 and photothermal transformation layer 4,9, the second intermediate layers 9, second intermediate layer and carrier 5 are set by another adhesive layer 3 ' bonding between photothermal transformation layer 4 and carrier 5.
Below will be described in more detail the assembly that constitutes layered product of the present invention.
Substrate
Substrate can be the fragile material that for example is difficult to by the common method attenuation.The example comprises semiconductor wafer, such as silicon and GaAs, and quartz wafer, sapphire and glass.
The printing opacity carrier
The printing opacity carrier is a kind of transmissive radiant energy, such as the material of used laser beam among the present invention, requires this material can make abrasive body be in formation state, can in grinding and transport process abrasive body be broken.The light transmittance of carrier is hard-core, as long as its radiant energy transmission that does not influence the practical intensity level enters photothermal transformation layer, can make this photothermal transformation layer take place to decompose and get final product.But preferably its transmissivity is 50% or higher.And, warpage takes place in process of lapping in order to prevent abrasive body, preferably this printing opacity carrier has sufficiently high rigidity, and preferably the flexible rigidity of this carrier is 2 * 10
-3(handkerchief cubic meter) or bigger is more preferably 3 * 10
-2(handkerchief cubic meter) or bigger.The example of useful carrier comprises sheet glass and acrylic sheet.And, in order to strengthen the bonding strength with adjacent layers such as photothermal transformation layers, can carry out surface treatment to carrier with silane coupler or analog when needed.When using UV curable photothermal transformation layer or adhesive layer, preferred this carrier transmissive ultra-violet radiation.
Sometimes when the irradiation photothermal transformation layer, when perhaps producing high temperature because of the frictional heat when grinding, this carrier can be subjected to the heat effect that photothermal transformation layer produces.And, in order on substrate, to form metallic film, can be before separating the grinding substrate from carrier, applying steam deposits again, processing such as plating or etching.Under the situation of silicon chip, sometimes make carrier stand high-temperature process especially, form sull.Therefore, select a kind of thermal endurance that has, chemical resistance and low-expansion carrier.Carrier material example with these character comprises Pyrex
TMWith Tenpax
TMBorosilicate glass, and Corning
TMAlkaline-earth metal such as #1737 and #7059 Boroalumino silicate glasses.
For the thickness evenness that obtains to require after grinding substrate, preferred vector thickness is uniform.Such as, for silicon chip grinding to 50 micron or thinner and obtain ± 10% or littler uniformity, the changeability of carrier thickness must be reduced to ± 2 microns or littler.When reusing carrier, also preferred this carrier has scratch resistance.In order to reuse this carrier, must select suitable radiant energy wavelength and carrier, suppress the damage of radiant energy to carrier.Such as, use Pyrex glass as carrier and when using triple-frequency harmonics that YAG laser (355 nanometer) takes place, can carry out separating of carrier and substrate, but this carrier shows low saturating rate in this laser wave strong point, can absorb this radiant energy, the result is that this carrier generation fire damage can not be used further in some situation.
Photothermal transformation layer
But photothermal transformation layer contains optical absorbing agent and heat decomposable resin.The radiant energy that puts on photothermal transformation layer with laser beam or similar type is absorbed by optical absorbing agent, and is converted into heat energy.The heat energy that is produced sharply rises the temperature of photothermal transformation layer, but arrives the heat decomposition temperature of heat decomposable resin (organic component) in the photo-thermal conversion coating, makes resin generation thermal decomposition.It is believed that the gas that thermal decomposition produces can form void layer (such as air gap) in photothermal transformation layer, and with the photothermal transformation layer separated into two parts, thereby carrier of separating and substrate.
Optical absorbing agent can be at used wavelength place absorbed radiation energy.Radiant energy normally wavelength is 300 to 11000 nanometers, the laser beam of 300 to 2000 nanometers preferably, and its instantiation comprises YAG laser, this optical maser wavelength of sending is 1064 nanometers; YAG laser takes place in second harmonic, and its wavelength is 532 nanometers; And semiconductor laser, its wavelength is 780 to 1300 nanometers.Though optical absorbing agent has nothing in common with each other according to laser beam wavelength, the example that is suitable for optical absorbing agent comprises carbon black, graphite powder, the particle metal powder, such as iron, aluminium, copper, nickel, cobalt, manganese, chromium, zinc and tellurium, metal oxide powder, such as black oxidation titanium, with dyestuff and pigment, such as aromatic series diaminourea metal complex, aliphatic diamine Base Metal complex, aromatic series dimercapto metal complex, mercapto-phenol Base Metal complex, squarylium based compound, cyanines radical dye, methine dyes, naphthoquinones radical dye and anthraquinone-based dyes.This optical absorbing agent can be a form of film, comprises the metallic film of vapor deposition.In these optical absorbing agents, carbon black is useful especially, because carbon black can significantly be reduced in after the irradiation the needed power of separate substrates from the carrier, and quickens this separation process.
The concentration of optical absorbing agent is according to the kind of optical absorbing agent in the photothermal transformation layer, graininess (structure) and decentralization and change, but the common carbon black concentration that granularity is about 5 to 500 nanometers 5 to 70 volume % normally.If its concentration is less than 5 volume %, heat decomposable resin decomposes but the heat that then photothermal transformation layer produced possibility is not enough, and if greater than 70 volume %, then the filming performance of photothermal transformation layer meeting variation may be easy to lose the adhesiveness to other layers.During as the adhesive of adhesive layer, if carbon black content is too high, the ultraviolet transmittance that then is used for cure adhesive can reduce with UV curable adhesives.Therefore, when using UV curable adhesives as adhesive layer, carbon black content should be 60 volume % or lower.The power that needs when removing carrier behind the irradiation in order to reduce, thereby prevent wearing and tearing photothermal transformation layer when grinding (such as because the wearing and tearing that the grinding agent in the rinse water causes), carbon black content is 20 to 60 volume % in the preferred photothermal transformation layer, is more preferably 35 to 55 volume %.
But the example of available heat decomposable resin comprises gelatin, cellulose, cellulose esters (such as, cellulose ethanoate, nitrocellulose), polyphenol, polyvinyl butyral resin, polyvinyl acetal, Merlon, polyurethane, polyester, poe, polyacetals, polyvinyl alcohol, PVP, the copolymer of vinylidene chloride and acrylonitrile, poly-(methyl) acrylate, polyvinyl chloride, organic siliconresin and the block copolymer that contains the polyurethane unit.These resins can use separately or two or more are used in combination.The glass transition temperature of this resin (Tg) is room temperature (20 ℃) or higher preferably, thereby prevent that in case photothermal transformation layer is separated because but the thermal decomposition of heat decomposable resin forms void layer, it is bonding once more, and more preferably Tg is 100 ℃ or higher, thereby prevents once more bonding.When the printing opacity carrier is glass, in order to increase the bonding force between glass and the photothermal transformation layer, can use have in a kind of molecule can take place with the silanol on the glass surface hydrogen-bonded polar group (such as ,-COOH, but-OH) heat decomposable resin.And, in the application that chemical solutions such as requiring to carry out chemical etching is handled, in order to make photothermal transformation layer have chemical resistance, but can use have in the molecule can be when heat treatment the heat decomposable resin of the functional group of self-crosslinking, can be by ultraviolet or visual light cross-linked heat decomposable resin or its precursor but (such as, the mixture of monomer and/or oligomer).For form when the thermal conversion layer as contact adhesive photothermal transformation layer as Fig. 1 (e) as shown in, used pressure-sensitive adhesive polymers from poly-(methyl) acrylate or analog formation as heat decomposable resin.
Transparent filler
Need, photothermal transformation layer can contain transparent filler.In case playing, transparent filler prevents photothermal transformation layer, the effect that it is bonding once more separated because but the heat decomposable resin thermal decomposition forms void layer.Therefore, can grind substrate and subsequently after the irradiation, further reduce the needed power of separate substrates and carrier.And, since can prevent once more bonding, so but widened range of choice to heat decomposable resin.The example of transparent filler comprises silica, talcum and barium sulfate.Using transparent filler is particularly advantageous when using UV curable adhesives as adhesive layer.Think at present for following reason.When particulate optical absorbing agents such as use carbon black, this optical absorbing agent plays and reduces the effect that separates required power, also plays the light transmissive effect of ultraviolet of interrupting.Therefore, when using UV curable adhesives as adhesive layer, solidification process may not can carry out satisfactorily, perhaps may need the very long time.In this case, when using transparent filler, can be after irradiation separate substrates and carrier at an easy rate, and can not influence the solidification process of UV curable adhesives.During particulate optical absorbing agents such as use carbon black, can determine the content of transparent filler according to the total amount of optical absorbing agent.The total amount of particulate optical absorbing agent (such as carbon black) and transparent filler 5 to 70 volume % of this photothermal transformation layer volume preferably in the photothermal transformation layer.Total amount can significantly reduce the power that separate substrates and carrier need in this scope the time.But, separate the influence that the power that needs also is subjected to particulate optical absorbing agent and transparent filler shape.More particularly, when the grain shape more complicated (because graininess that complicated structure causes), sometimes use small amount of filler just can be more fairly simple the time than grain shape, during such as subglobular, more effectively reduce separate need power.
Therefore, in some cases, the total amount of particulate optical absorbing agent and transparent filler is (TFVC) definite by " the highest packing volume concentration ".But this mixture that is meant particulate absorbent and transparent filler is under drying regime and the packing volume concentration of heat decomposable resin when mixing with filler with the content of only filling voidage.That is the TFVC when, heat decomposable resin mixes with filler with the content of voidage in the mixture of only filling particulate optical absorbing agent and transparent filler is 100% the highest packing volume concentration.In the photothermal transformation layer total amount of particulate optical absorbing agent and transparent filler preferably the highest packing volume concentration 80% or more, be more preferably 90% or more.In further instruction, filler (such as, carbon black and transparent filler) total volume percent be represented as " A ", the highest packing volume percentage, TFVC (total volume percent of the resin of filler and filling free volume of packings) is represented as " B ", and then A/B is preferably greater than about 80% (more preferably A/B＞90%).
Can use oil absorption, fill the needed amount of liquid of voidage of Unit Weight filler, the voidage of expression filler.For carbon black, the measured value in the commodity in use catalogue for transparent filler (such as, silica), uses the general value (200 gram/cubic centimetre) of this class silica.
Though be not subjected to any theory constraint, think that at present the laser that the optical absorbing agent in the photothermal transformation layer (such as carbon black) absorbs by the radiation of transparent carrier institute can and convert thereof into heat energy, matrix resin is decomposed and generation gas or space.The result is that the space makes this layer be separated into two parts, and is two-layer such as forming, and semiconductor wafer is peeled off from carrier.The surface of being separated by the space is as long as will contact once more with the surface after a while.Have carbon black granules and cull on the surface, the molecular weight of these resins decreases because of thermal decomposition.In contact process once more (such as, bonding once more), these culls can increase adhesiveness.On the other hand, when photothermal transformation layer and adhesive layer were all very soft, contact area can be bigger once more, makes adhesiveness bigger, is difficult under the situation that is not damaged or breaks and peels off ultra thin wafer from carrier.In the present invention, set A/B＞80%, preferred A/B＞90% can reduce resin residual on the stripper surface.Thus, can make the adhesiveness that produces because contact once more become minimum.And, when improving amount of carbon blacks, use transparent filler satisfying A/B＞80%, or＞90% requirement, can keep the thickness of photothermal transformation layer requirement at least, can keep simultaneously as desired ultraviolet transparency when adhesive layer is the ultra-violet curing type.
Therefore, total amount is in this scope the time, at an easy rate carrier of separating after irradiation.
Normally about 0.5 micron of the thickness of photothermal transformation layer.If thickness is too little, then adjacent sticking layered portion is exposed to stripper surface, and this can improve the adhesiveness of stripper surface, and particularly when adhesive layer was soft, this can cause being difficult to peel off ultra thin wafer (under the situation of not breaking).
If necessary, photothermal transformation layer can contain other additives.Such as, but by applying the heat decomposable resin of monomer or oligomer form, polymerization or solidify this resin and form under the situation of this layer then, this layer can contain Photoepolymerizationinitiater initiater.And, the adding coupling agent (the integral blend method, promptly, in prescription, use coupling agent as additive, rather than as pre-surperficial inorganic agent) increase the bonding force between glass and the photothermal transformation layer, and add crosslinking agent raising chemical resistance, can reach its purpose separately effectively.And the separation that takes place because of the decomposition of photothermal transformation layer in order to promote can contain the cryogenic gas propellant.The representative example of available cryogenic gas propellant comprises blowing agent and sublimed agent.The example of blowing agent comprises sodium acid carbonate, ammonium carbonate, and carbonic hydroammonium, zinc carbonate, Celogen Az, azodiisobutyronitrile, N, N '-dinitrosopentamethylene tetramine, right-toluene sulfonyl hydrazide and right is right-oxygen two (benzene sulfonyl hydrazide).The example of sublimed agent comprises 2-diazo-5,5-dimethyl cyclohexane-1,3-diketone, camphor, naphthalene, borneol, butyramide, pentanamide, 4-tert-butyl phenol, furans-2-carboxylic acid, succinyl oxide, 1-adamantanol and 2-adamantane ketone.
With optical absorbing agents such as carbon blacks, but heat decomposable resin and solvent are prepared into the precursor coating solution, and this solution is coated on the carrier, and make it dry, can form this photothermal transformation layer.Equally, with optical absorbing agent, but as the monomer or the oligomer of heat decomposable resin precursor substance, and optional additive, such as Photoepolymerizationinitiater initiater, if necessary, solvent is prepared into the precursor coating solution, but replace heat decomposable resin solution, this solution is coated on the carrier, and dry and polymerizable/curable can form this photothermal transformation layer.For coating, can use to be suitable for the general painting method that on hard carrier, applies, such as spin coating, mouthful pattern coating, and rolling method.When forming the photothermal transformation layer in the two-sided tape shown in Fig. 1 (c) to (e), can adopt a mouthful pattern coating, methods such as intaglio plate coating and blade coating form photothermal transformation layer on film.
Generally speaking, the thickness of photothermal transformation layer is hard-core, as long as can make carrier and substrate separation, but normally 0.1 micron or bigger of this thickness.Desired optical absorbing agent concentration can uprise if thickness, then is used for enough light absorption less than 0.1 micron, and this can make the bad people of film forming, and the result is, can not be bonding to adjacent layer.On the other hand, if the thickness of photothermal transformation layer is 5 microns or bigger, and makes the photothermal transformation layer thermal decomposition and separate desired optical absorbing agent concentration and keep constant, then the light transmittance of photothermal transformation layer (or its precursor) can reduce.The result is, when using the photothermal transformation layer of photocurable such as UV curable light and adhesive layer, suppresses can not obtain behind the solidification process degree of abundant cured product sometimes.Therefore, when photothermal transformation layer is for example during UV curable, in order to make after irradiation the needed power minimum of separate substrates from the carrier, and prevent that photothermal transformation layer is worn when grinding, the thickness of preferred photothermal transformation layer is about 0.3 to 3 micron, is more preferably about 0.5 to 2.0 micron.
Adhesive layer
With adhesive layer substrate to be ground is fixed on the carrier by photothermal transformation layer.After the decomposition and separation substrate and carrier by photothermal transformation layer, can obtain to have on it substrate of adhesive layer.Therefore, adhesive layer must be able to separate from substrate at an easy rate, such as by peeling off realization.Therefore, this adhesive layer has and is high enough to substrate is fixed on bonding strength on the carrier, but its bonding strength is again enough low, and it can be separated from substrate.The examples of adhesives that can be used as adhesive layer of the present invention comprises rubber-based adhesive, and it is by with rubber, and elastomer or analog are dissolved in the solvent and obtain; Based on epoxides, the one pack system resinoid of carbamate or analog; Based on epoxides, carbamate, the bi-component resinoid of acryloyl group or analog; Hotmelt; Based on acryloyl group, but the ultraviolet of epoxides or analog or electronic beam curing adhesive; With aqueous dispersion build adhesive.The UV curable adhesives that is suitable for is by add Photoepolymerizationinitiater initiater in following material, and add additive when needed and obtain, (1) has the oligomer of polymerizable vinyl, such as urethane acrylate, epoxy acrylate or polyester acrylate, and/or (2) acrylic or methacrylic acids monomer.Example additives comprises thickener, plasticizer, dispersant, filler, fire retardant and heat stabilizer.
Particularly, substrate to be ground such as silicon chip has certain roughness usually, such as have circuit diagram on its one side.For filling on-chip coarse place to be ground and making the uniform adhesive layer of bondline thickness, the adhesive that is preferred for adhesive layer is a liquid condition in coating and lamination process, preferably apply and the laminating operation temperature (such as, 25 ℃) time viscosity less than 10000 centipoises (cps).In following the whole bag of tricks, preferably adopt spin-coating method to apply this liquid adhesive.Preferred especially UV curable adhesives and visible-light curing adhesive are as this adhesive, because these adhesives can make the thickness of adhesive layer become evenly, and can improve process velocity for the above reasons.
For solvent type adhesive, under the application conditions after removing this adhesive solvent, for curable adhesive, under the application conditions after solidifying, perhaps for hotmelt, under the application conditions after cold(-)setting, preferably the storage modulus of this adhesive in the time of 25 ℃ is 100 MPas or bigger, and the storage modulus in the time of 50 ℃ is 10 MPas or higher.Have this modulus of elasticity, can prevent that substrate to be ground from because being subjected to stress warpage or distortion taking place when grinding, can evenly be ground to form ultrathin substrate.Can be with the adhesive sample of 22.7 millimeters * 10 millimeters * 50 micron-scales,,, under 0.04% strain and 5 ℃ of/minute intensification speed used here storage modulus or modulus of elasticity are measured at 1 hertz frequency with stretching mode.Can use by Rheometrics, the SOLIDS ANALYZER RSA II (trade name) that Inc. makes measures this storage modulus.
Can use Fig. 1 (b) to arrive the tacky on two sides band shown in (e) as adhesive layer.In this tacky on two sides band, on two surfaces of back lining materials, all has pressure-sensitive adhesive layer usually.The example that is suitable for contact adhesive comprises and mainly contains acryloyl group, carbamate, the adhesive of natural rubber or analog, and the adhesive that also contains crosslinking agent in addition.Wherein preferably contain 2-EHA or butyl acrylate adhesive as main component.Use paper or plastic film or analog as back lining materials.Here said backing must have sufficiently high flexibility, could be from substrate by the peel separation adhesive layer.
Also find, substrate grinding during to ultrathin, is preferably being used specific Photocurable adhesive.During with substrate grinding to 50 micron or littler thickness, sometimes can go wrong, can enter in the interface between substrate and the adhesive layer such as water, substrate edge is broken or damage the middle body of substrate.For fear of these problems, usually to grind than slow rate.This is extended for milling time to be ground to the twice of 150 microns or bigger common required time of polishing thickness.Such as, by reducing the number of revolutions of emery wheel, can avoid damaging.Generally speaking, after grinding the back side, the ultra-thin semiconductor wafer is carried out polishing process, remove residual damaged layer (ground rather than layer that monocrystal damaged).In grinding or polishing process, for under the situation of not sacrificing grinding rate, avoiding occurring water enters in the interface between substrate and the adhesive layer, the substrate edge fragmentation, perhaps damage the problem of substrate center part, adhesive layer is about 2.0 (newton/3.5 square centimeter) or higher when measuring described in following examples to the bonding strength (pattern of riving is referring to Fig. 9 and the following description) of substrate to be ground at least.
When Photocurable adhesive solidified on substrate to be ground, bond area can reduce because of cure shrinkage, and the bonding strength of substrate is also reduced easily.In order to guarantee above-mentioned bonding strength, the preferred photocurable adhesive is the adhesive that can recover bonding strength when being heated above its glass transition temperature (Tg).The minimum storage modulus that this adhesive records in the time of 25 to 180 ℃ is 3.0 * 10
7To 7.0 * 10
7Handkerchief.If minimum storage modulus is too high, then can not obtain sufficiently high bonding strength, this can cause water to enter in the interface between substrate and the adhesive layer, and substrate edge is damaged or damage the substrate center part.On the other hand, if minimum storage modulus is too low, then after the heating process,, be difficult to separate adhesive layer (viscous layer) such as being laminated to after the sheet bonding mould adhesive tape.
And, under the temperature that can reach, the interface of substrate and adhesive layer storage modulus preferably 9.0 * 10 of (normally 40 to 70 ℃) when grinding such as 50 ℃
7Handkerchief or higher is more preferably 3.0 * 10
8Handkerchief or higher.When storage modulus is in this scope, can prevent that when grinding milling tool pushing in vertical direction from causing adhesive layer local deformation to be taken place to the degree of damaging substrate to be ground (silicon chip).
As satisfying all Photocurable adhesive examples of these conditions; molecular weight be 3000 or the total amount of higher difunctionality carbamate (methyl) acrylate oligomer be 40 weight % or more, the total amount of difunctionality (methyl) acryl monomer is that 25 weight % or more adhesive are known and suitable.But, this adhesive is not particularly limited, as long as it has essential attributes (bonding strength, functionality) and gets final product.
The thickness of adhesive layer is not particularly limited, as long as it can guarantee the thickness evenness that substrate grinding to be ground is required and remove after the carrier the required tearing strength of release adhesive layer from the wafer from layered product, and can cover coarse the getting final product on the substrate surface fully.Normally about 10 to 150 microns of the thickness of adhesive layer, preferably about 25 to 100 microns.
Other useful additives
Because the substrate to be ground of layered product of the present invention can be the wafer that is formed with circuit on it, so wafer circuit may be by by the printing opacity carrier, photothermal transformation layer and adhesive layer and the radiant energy such as laser beam that arrive wafer damage.In order to prevent that sort circuit from damaging, constituting in any layer of this layered product or can contain in the independent layer that is provided with between photothermal transformation layer and wafer can be at the light-absorbing extinction dyestuff in radiant energy wavelength place or a kind of reverberation pigment that can reflect this light.The example of extinction dyestuff be included near have absworption peak the used laser beam wavelength dyestuff (such as, phthalocyanine radical dye and cyanines radical dye).The example of reverberation pigment comprises inorganic Chinese whites such as titanium oxide.
Additional useful layer
Can comprise in the layered product of the present invention except substrate to be ground, with the adhesive layer that substrate to be ground contacts, the extra play outside photothermal transformation layer and the printing opacity carrier.The example of extra play comprises first intermediate layer 6 as shown in Fig. 1 (f), and it is between adhesive layer 3 and photothermal transformation layer 4; And/or second intermediate layer 9, it is between photothermal transformation layer 4 and carrier 5.Preferred second intermediate layer 9 and carrier 5 are bonding by adhesive layer 3 ' (such as, contact adhesive).
When having first intermediate layer 6, layered product 1 is separated at photothermal transformation layer 4 places after the irradiation, obtains the layered product of first intermediate layer, 6/ adhesive layer, 3/ substrate 2.Therefore, the two as backing, can be separated at an easy rate in this first intermediate layer 6 from substrate 2 separation adhesive layers 3 time.This first intermediate layer 6 is multilayer optical film preferably.And this first intermediate layer 6 preferably can optionally be reflected YAG laser (near-infrared wavelength light) etc. and separate film with radiant energy.Because when first intermediate layer 6 not transmissive but reflected radiation can the time, just prevent the wafer surface that radiant energy arrives circuit, this has just eliminated the possibility of damaging circuit, therefore this film is preferred.When using Photocurable adhesive, preferably has the film that sufficiently high ultraviolet light etc. solidifies light transmittance as adhesive layer 3.Therefore, preferably this multilayer optical film transmissive ultraviolet light and optionally reflect near infrared light.The preferred multilayer optical film of this transmissive ultraviolet light and reflect near infrared light can be 3M
TMThe Solar reflective film (3M Company, St.Paul, MN).The substrate effect is played in this first intermediate layer 6, is used for removing adhesive layer 3 by peeling off from substrate 2, and therefore preferred its thickness is 20 microns or bigger, be more preferably 30 microns or bigger, fracture strength is 20 MPas or bigger, more preferably is 30 MPas or bigger, is more preferably 50 MPas or bigger.
When having above-mentioned second intermediate layer 9, after the irradiation layered product 1, obtain second intermediate layer, 9/ adhesive layer 3 '/layered product of printing opacity carrier 5.Therefore, this second intermediate layer 9 separate adhesive layer 3 ' and during carrier 5 as backing, can separate the two at an easy rate.Therefore, by second intermediate layer is provided, can prevents that photothermal transformation layer 4 or adhesive layer 3 ' (contact adhesive) from remaining on the printing opacity carrier 5, and can reuse carrier 5 at an easy rate.For after laser irradiation, under the situation of not breaking from the carrier 5 by its strip off is removed adhesive layer 3 ', the thickness in preferred this second intermediate layer 9 is 20 microns or bigger, be more preferably 30 microns or bigger, its fracture strength is 20 MPas or bigger, more preferably be 30 MPas or bigger, be more preferably 50 MPas or bigger.In some cases, the resin in second intermediate layer 9 can penetrate in the photothermal transformation layer 4, such as when second intermediate layer with the photocurable oligomer and the monomer mixture form is coated and during with ultraviolet light polymerization (such as, by photothermal transformation layer is coated on the film substrate, be coated in second intermediate layer on the photothermal transformation layer and make its curing, and adhesive layer is coated in when making this sheet on this second intermediate layer).In these cases, bonding once more in order to prevent that the surface separated because laser irradiation forms the space from taking place, the Tg of this resin (for light-curable resin, being the Tg that solidifies the back resin) must be 40 ℃ or higher.
Make layered product
When making layered product, prevent that objectionable entering between the layer such as air from being very important.Such as, if air enters between the layer, then the thickness of layered product becomes inhomogeneous, and substrate grinding to be ground can not be become thin substrate.When the layered product shown in Fig. 1 (a) is made, can consider following method.At first, the precursor coating solution of photothermal transformation layer is coated on the carrier by above-mentioned any method, carries out irradiation, make it dry and solidify with ultraviolet light or similar radiation.Then, one or two surface that adhesive layer is coated in the photothermal transformation layer of curing go up and the non-lapped face of substrate on.Photothermal transformation layer and substrate are bonding by adhesive layer, pass through the ultraviolet light irradiation cured adhesive layer from carrier side then, thereby can form a layered product.Preferably under vacuum, form this layered product, enter between the layer to prevent air.Such as, this can realize by the vacuum bonding equipment described in repacking Japanese unexamined patent publication (disclosing) 11-283279.Make as Fig. 1 (b) when arriving layered product as shown in (e), can use a kind of preformed according to a conventional method two-sided tape lamination substrate to be ground and carrier, and form this layered product easily.This preferably carries out under the vacuum condition of similar above-mentioned situation equally.In the layered product shown in Fig. 1 (f), adhesive layer 3 and 3 ' all be pressure-sensitive adhesive layer, can be according to the same procedure manufacturing of Fig. 1 (b) to (e) layered product, promptly on two surfaces in first intermediate layer/photothermal transformation layer/second intermediate layer, form dual coating adhesive tape with contact adhesive, and lamination substrate to be ground and carrier thereon.In this case, second intermediate layer directly is coated on the photothermal transformation layer, and is fixed on the carrier with adhesive layer 3 ' (contact adhesive or Photocurable adhesive).When adhesive layer 3 and 3 ' when being Photocurable adhesive, can make this layered product according to the same procedure of layered product shown in Fig. 1 (a).The vacuum bonding equipment that can be used for forming layered product is as described below.
Preferably layered product being designed to can not have the water of use to enter when grinding substrate, and its plunger bond strength can not make substrate drop, and its anti-wear performance prevents current (slurry) wearing and tearing that photothermal transformation layer is contained grinds the substrate dust.
Make the wear down substrate
The method of making the wear down substrate comprises: the layered product that preparation as above forms, grind substrate to the thickness that requires, photothermal transformation layer is applied emittance, photothermal transformation layer is decomposed by the printing opacity carrier, separate substrate from the printing opacity carrier thus, release adhesive layer from the substrate through grinding.
On the one hand, method of the present invention is described as follows with reference to the accompanying drawings.Hereinafter use laser beam as radiation energy, use silicon chip as substrate to be ground, but the present invention is not limited to this.
Shown in Figure 2 is to be applicable to the sectional view of making the vacuum bonding equipment of layered product in example of the present invention.Vacuum bonding equipment 20 comprises vacuum chamber 21; Be arranged on the support component 22 in the vacuum chamber 21, place a substrate 2 to be ground (silicon chip) or carrier 5 on the support component; Be arranged on and fix/loosen device 23 in the vacuum chamber 21, this device can move in vertical direction on the top of support component 22, another carrier 5 of clamping or silicon chip 2.Vacuum chamber 21 links to each other by pipeline 24 with pressure regulating equipment 25, can reduce the pressure in the vacuum chamber 21.Fix/loosen device 23 have can be in vertical direction the axle 26 of motion down, be arranged on the contact surface parts 27 of the end of axle 26, be arranged on the spring leaf 28 of periphery of contact surface parts 27 and the fixed claw 29 that stretches out from each spring leaf 28.As shown in Fig. 2 (a), when the upper surface of spring leaf contact vacuum chamber 21, spring leaf is compressed, and fixed claw 29 is towards vertical direction, the outer rim of holding carrier 5 or wafer 2.On the other hand, as shown in Fig. 2 (b), when axle 26 was depressed, carrier 5 or wafer 2 were in close proximity to wafer 2 or the carrier 5 that lays respectively on the support component, and fixed claw 29 is released, with spring leaf 28 superimposed carriers 5 and wafer 2.
Use this vacuum bonding equipment 20, can manufacturing layered product as described below.At first, as mentioned above, photothermal transformation layer is placed on the carrier 5.Prepare to treat the lamination wafer in addition.On in the two one or two of the photothermal transformation layer of wafer 2 and carrier 5, apply adhesive, form adhesive layer.The carrier 5 and the wafer 2 of so preparation are placed in the vacuum chamber 21 of vacuum bonding equipment 20 shown in Fig. 2 (a), reduce pressure with pressure regulating equipment, as shown in Fig. 2 (b), depress 26 pairs of wafers of axle and carry out lamination, after the bubbling air, cure adhesive obtains layered product if desired.
Shown in Figure 3 is the partial cross section figure that can be used for the milling apparatus of an example of the present invention.Milling apparatus 30 comprises base 31 and is fixed on emery wheel 33 on axle 32 bottoms with rotary way.Base 31 belows have suction inlet 34, and this suction inlet 34 links to each other with the pressure regulating equipment (not shown), aspirates material to be ground thus, and are fixed on the base 31 of milling apparatus 30.Preparation layered product of the present invention 1 as shown in Figure 1 is as material to be ground.The carrier side of layered product 1 is installed on the base 31 of milling apparatus 30, uses pressure regulating equipment fixing by suction.Then, when entering one flow (such as water or can be used for any known solution of wafer grinding), the emery wheel 33 of rotation is contacted with layered product 1, grind thus.Grinding can proceed to 150 microns or littler ultra-thin level, preferably 50 microns or littler, is more preferably 25 microns or littler.
Be ground to require to wait have after, take out layered product 1, and be sent to next procedure, in next procedure by with laser beam irradiation separating wafer and carrier, and from the wafer the release adhesive layer.Shown in Figure 4 is the operation of carrier of separating and release adhesive layer.At first, consider last slicing process, if necessary, can on the lapped face of layered product 1 wafer side, lay a die molding adhesive tape 41 (Fig. 4 (a)) or not place die molding adhesive tape (Fig. 4 (a ')), lay section adhesive tape 42 and section framework 43 (Fig. 4 (b)) subsequently.Subsequently, carry out the irradiation (Fig. 4 (c)) of laser beam 44 from the carrier side of layered product 1.After the laser beam irradiation, pick up carrier 5, carrier of separating 5 (Fig. 4 (d)) from the wafer 2.Last peel separation adhesive layer 3 obtains wear down silicon chip 2 (Fig. 4 (e)).
Usually semiconductor wafers such as silicon chip are called cutting sth. askew of chamfering, it is damaged because impact to prevent its edge.That is, the angle of silicon chip edge part is by rounding.Use a kind of liquid adhesive as adhesive layer and when adopting spin-coating method to apply, adhesive layer is coated on the marginal portion, adhesive is exposed on the marginal portion of lapped face.The result is that when laying the section adhesive tape, not only grinding wafers contacts with the contact adhesive of section adhesive tape, and the adhesive that exposes also is in contact with it.If the adhesiveness of used section adhesive tape is very strong, sometimes be difficult to separate adhesive layer.In this case, preferably before laying section adhesive tape and section framework, remove the adhesive that part exposes in advance.For the exposed adhesive of removing the marginal portion, radiant energy or CO that use can fully be absorbed by adhesive
2Laser (wavelength is 10.6 microns) is effectively.
Shown in Figure 5 is to be used for the sectional view of the present invention with the layered product fixture of operations such as laser beam.Layered product 1 is installed on the fixed head 51, makes carrier become upper surface with respect to fixture 50.Fixed head 51 is by porous metals such as sintering metals or has the metal of surface roughness.Use the vacuum equipment (not shown) to reduce pressure from the bottom of fixed head 51, layered product 1 is fixed on the fixed head 51 by taking out thus.Pull of vacuum is preferred strong to be enough to that it is dropped in the subsequent handling of carrier of separating and release adhesive layer.Use laser beam that fixing in this manner layered product is carried out irradiation.In order to launch laser beam, but the output of selected laser beam sources should be high enough to make the heat decomposable resin in the photothermal transformation layer to decompose being absorbed the wavelength of light place by photothermal transformation layer, will produce decomposition gas like this, can carrier of separating and wafer.Such as, can use YAG laser (wavelength is 1064 nanometers), second harmonic YAG laser (wavelength is 532 nanometers) and semiconductor laser (wavelength is 780 to 1300 nanometers).
Selecting can scanning laser beam, forms the pattern that requires on irradiating surface, and can setting laser output and the equipment of laser beam translational speed as laser irradiation equipment.And, in order to make the stable processing quality of irradiation material (layered product), select for use equipment with big depth of focus.The dimensional accuracy of device design is depended in the variation of the depth of focus, for the not special restriction of the depth of focus, but preferred 30 microns or bigger.Shown in Figure 6 is the perspective view that can be used for laser irradiation equipment of the present invention.Galvanometer is equipped with in the laser irradiation equipment 60 of accompanying drawing 6 (a), its twin shaft configuration is made up of X-axis and Y-axis, its design can make the laser beam that produces from laser oscillator 61 vibrations be reflected by Y-axis galvanometer 62, and further by 63 reflections of X-axis galvanometer, and irradiation is on the layered product on the fixed head 1.Direction decision irradiation position according to galvanometer 62 and 63.The laser irradiation equipment 60 of Fig. 6 (b) is equipped with single shaft galvanometer or polygon mirror 64 and an energy being orthogonal to the platform 66 that moves on the direction of scanning.The laser beam that sends from laser oscillator 61 is reflected by galvanometer or polygon mirror 64, mirror 65 reflections that further are fixed, and irradiation is on the layered product on the moveable platform 66 1.The irradiation position is determined by the direction of galvanometer or polygon mirror 64 and the position of moveable platform 66.In the equipment of Fig. 6 (c), laser oscillator 61 is installed on the moveable platform 66, and this platform moves on the biaxially oriented of X and Y, and laser irradiation is on the whole surface of layered product 1.The equipment of Fig. 6 (d) comprises fixed laser oscillator 61 and the platform 66 that can move on the biaxially oriented of X and Y.The composition of Fig. 6 (e) equipment is, laser oscillator 61 be installed in moveable platform 66 ' on, this platform can move on the single shaft direction, layered product 1 is placed in moveable platform 66 " on, this platform can be orthogonal to moveable platform 66 ' direction on move.
When the wafer of being concerned about layered product 1 can be damaged by laser irradiation, be preferably formed the radiant energy of a kind of silk hat shape (referring to accompanying drawing 6 (f)), it has steep Energy distribution, and is very low to the energy leakage of adjacent area.Can adopt any known method to change this laser beam form, such as, (a) method of use acousto-optic devices enable beam steering, with the method for refraction/diffraction approach formation laser beam, perhaps (b) clips the method for widened section at the place, two edges with aperture or slit.
Laser irradiation can be by laser power, and laser beam flying speed and beam diameter are determined.Such as, operable laser power is 0.3 to 100 watt (W), but is not limited to this scope, and sweep speed is 0.1 to 40 meter per second (m/s), and beam diameter is 5 to 300 microns or bigger.In order to accelerate the speed of this operation, can improve laser power, thereby add fast scan speed.Because can further reduce scanning times when beam diameter becomes big, when laser power is enough high, can increase beam diameter.
But the heat decomposable resin in the photothermal transformation layer decomposes because of laser irradiation, produces a kind of gas, and it cracks in layer, and photothermal transformation layer is separated voluntarily.If air enters between the crackle, just can avoid the bonding once more of crackle.Therefore, enter, preferably carry out laser beam flying to the inside of layered product from the marginal portion of layered product for the ease of air.
As mentioned above, the glass transition temperature of photothermal transformation layer (Tg) room temperature (20 ℃) or higher preferably.This is because the crackle that has separated may take place once more bonding when cooling has been decomposed resin each other, thereby can't separate.Thinking once more bonding is crackle bonded to each other generation under vehicle weight owing to photothermal transformation layer.Therefore, when the irradiation process is designed to can not apply vehicle weight, just can prevent once more bonding, such as, carry out laser irradiation (that is, carrying out laser irradiation as the configuration of bottom surface) in vertical direction from top to bottom or between wafer and photothermal transformation layer, insert crotch from the marginal portion and uncover this layer with carrier.
To use laser beam from the marginal portion of layered product, can adopt the applying method that to the wafer tangential direction laser beam straight line is come and gone from the marginal portion, perhaps adopt from the marginal portion to the method for middle body with the similar mode spirality irradiation laser bundle that plays a record.
After the laser irradiation, carrier of separating from the wafer when carrying out this operation, has used general vacuum pick device.Taking off and getting device is a cylinder part that links to each other with vacuum equipment, and its end has a pumping equipment.Shown in Figure 7 is to be used for the schematic diagram that taking off of separating wafer and carrier operation got device.In Fig. 7 (a), take off and get the central authorities that device 70 is positioned at carrier 5, pick up with vertical direction, thereby peel off carrier.In addition, as shown in Fig. 7 (b), pick-up 70 is positioned at the marginal portion of carrier 5, is blown into one compressed air (A) when peeling off from the side, and it is entered between wafer 2 and the carrier 5, can more easily peel off carrier.
Remove after the carrier, remove the adhesive layer on the wafer.It shown in the accompanying drawing 8 schematic diagram of release adhesive layer how.For removing adhesive layer 3, can preferably use adhesive tape 80 to remove adhesive layer, this adhesive tape can and adhesive layer 3 produce than stronger bonding between wafer 2 and the adhesive layer 3.This adhesive tape 80 is laid and is bonded on the adhesive layer 3, peel off with direction shown in the arrow then, just can remove adhesive layer 3.
Stay the wear down wafer that is fixed on section adhesive tape or the die cut frames at last, have the die molding adhesive tape, also can not have the die molding adhesive tape.According to conventional method this wafer is cut into slices, finish chip.But can before laser irradiation, cut into slices.In this case, also can when wafer and carrier are still bonding, carry out slicing process, only break area be carried out laser irradiation then, and only at the sliced section carrier of separating.The present invention also is applicable to and do not using section independently to carry out slicing process during adhesive tape, by adhesive layer grinding wafers is transferred on the printing opacity carrier that has photothermal transformation layer on it once more to get final product.
The present invention is effective in following application.
1. the lamination CSP (chip size packages) that is used for high-density packages
The present invention can constitute the encapsulation of laminated type multicore sheet with the device that is called as interior system in package, accommodates integrated on a large scale in a large number (LSI) device and passive component in single interior system in package, can realize multi-functional or high-performance.According to method of the present invention, can make 25 microns or thinner wafer for these device high productivities are reliable.
2. require the through-type CSP of high-performance and High-speed machining
In this device, chip connects by straight-through electrode, thereby shortens length of arrangement wire and improve electrical property.For the technical solution problem, lead directly to the through hole of electrode and in through hole, embed copper such as being formed for, must further reduce chip thickness.When using layered product of the present invention to form chip in proper order, must on chip back surface, form insulation film and projection (electrode), and lamination needs the heat-resisting and chemicals-resistant of body with this structure.Select above-mentioned carrier, when photothermal transformation layer and adhesive layer, even also can use the present invention effectively in this case.
3. radiation efficiency, the ultra-thin composite semiconductor that electrical property and stability increase (such as, GaAs)
Compound semiconductors such as GaAs are used to the high-performance separate chip because it is better than the electrical property (high electron mobility, directly transition type band structure) of silicon, in the laser diode etc.Use lamination physical efficiency of the present invention to reduce chip thickness, improve its radiating efficiency, and improve performance.At present, be by using grease or protective materials that semiconductor wafer is bonded to as carrying out on the glass substrate of carrier for the grinding operation that reduces thickness and formation electrode.Therefore, this jointing material must machine the back by dissolution with solvents, separating wafer from the glass substrate.The subsidiary problem of this method is that separating needs many days time, and must dispose waste liquid.Just can address these problems when using layered product of the present invention.
4. be applied to wafer in order to improve output
For wafer (such as, the silicon chip of 12 inch diameters), wafer is very important with separating easily of carrier.When using layered product of the present invention, can separate at an easy rate, therefore, the present invention also can be used in this field.
5. ultra-thin quartz wafer
In the quartz wafer field, require to reduce wafer thickness to improve frequency of oscillation.When using layered product of the present invention, can separate at an easy rate, therefore, the present invention also can be used in this field.
Be described in more detail the present invention below with reference to embodiment.
At first, use various laser irradiation conditions, estimate the optimum condition that is used for carrier of separating and wafer.Because the degree of decomposition the when character of separating depends on photothermal transformation layer Stimulated Light irradiation, so use glass substrate to substitute grinding wafers.Use the glass substrate of 127 millimeters (mm) * 94 millimeter * 0.7 millimeter to use above-mentioned same glass substrate to substitute wafer as the printing opacity carrier.10% solution (in the propylene glycol methyl ether acetate solvent) that adopts spin-coating method will have the photothermal transformation layer precursor of forming shown in the following table 1 is coated on the glass substrate.
Table 1: photothermal transformation layer
| ? | The solids content ratio |
| EC600JD | 15.91％ |
| Solasperse?5000 | 0.80％ |
| Disperbyk?161 | 12.78％ |
| UR8300 | 39.81％ |
| Ebecryl?EB629 | 11.64％ |
| TMPTA-N | 11.64％ |
| Irgacure?369 | 6.47％ |
| Irgacure?184 | 0.96％ |
| Amount to | 100.00％ |
EC600JD (Ketjen Black International Co.): carbon black, particle mean size 30 nanometers; Solsperse 5000 (Zeneca Co., Ltd.): dispersing aid Disperbyk 161 (BYK ChemieJapan Co., Ltd.): dispersant (being 30% in butyl acetate); UR8300 (Toyobo Co., Ltd.): urethane-modified mylar (being 30% in toluene/methyl ethyl ketone), MW=30000, Tg=23 ℃, fracture strength is 400 kilograms/square centimeter, elongation at break is 500%; Ebecryl EB629 (Daicel UCB Co.Ltd.): be diluted to 33% phenolic resin varinish epoxy acrylate, oligomer MW=550 with monomer (TMPTA).
TMPTA-N (Daicel UCB Co.Ltd.): trimethylolpropane triacrylate Irgacure 369 (Ciba Specialty Chemicals K.K.): 2-benzyl-2-N, N-dimethylamino-1-(4-morpholino phenyl)-1-butanone; With Irgacure 184 (Ciba Specialty Chemicals K.K.): the 1-hydroxycyclohexylphenylketone.
Heating (80 ℃, 2 minutes) makes its drying, uses ultraviolet (UV) radiation curing then, forms photothermal transformation layer on carrier.To have the adhesive layer precursor of forming shown in the following table 2 dropwise is coated on another glass substrate.These substrates are laminated together each other, carry out ultraviolet irradiation, the cured adhesive layer precursor, thus obtain layered product.
Table 2: adhesive layer
| ? | The solids content ratio |
| UV-6100B | 57.10％ |
| HDODA | 38.10％ |
| Darocure1173 | 4.80％ |
| Amount to | 100.00％ |
UV-6100B (Nippon Synthetic Chemical Industry Co., Ltd): propylene acidifying oligourethane, the Tg after the MW=6700, ultra-violet curing is 0 ℃; HDODA (Daicel UCB): 1, the 6-hexanediyl ester; Darocure1173 (Ciba Specialty Chems.): 2-hydroxy-2-methyl-1-phenyl third-1-ketone.
The structure of this layered product is glass substrate/photothermal transformation layer/adhesive layer/glass substrate, and the thickness of photothermal transformation layer is 0.9 micron, and bondline thickness is 100 microns.This layered product is placed on the fixed head of layered product permanent plant shown in Figure 4, uses vacuum equipment to reduce pressure, layered product is fixed on the fixed head with suction force from downside.Use the laser beam sources of YAG laser (wavelength is 1064 nanometers) as radiant energy.Laser output changes in 0.52 to 8.00 watt scope, beam diameter is identical with scanning pitch, in 90 to 200 microns scope, change, laser scanning speed changes in the scope of 0.2 to 5 meter per second, from layered product marginal portion linear reciprocation apply laser beam, laser beam irradiation is on the whole surface of layered product.
On through the layered product glass substrate of the such irradiation of laser beam, paste pressure sensing adhesive band (SCOTCH
TMThe pressure sensing adhesive band, from 3M Company, St.Paul, the #3305 that MN obtains), pick up then.
By this preliminary test, to find to be output as 6.0 to 8.0 watts when laser, beam diameter and scanning pitch are 100 to 200 microns, and laser scanning speed is when being 0.2 to 2.0 meter per second, the effect of separation of glasses substrate is fine.
Embodiment 1:
The glass substrate that uses 220 millimeters (diameter) * 1.0 millimeter (thickness) is as the printing opacity carrier, with the silicon chip of 200 millimeters (diameter) * 750 micron (thickness) as wafer.10% solution (in the propylene glycol methyl ether acetate solvent) that adopts spin-coating method will have the photothermal transformation layer precursor of forming shown in the last table 1 is coated on the glass substrate.To its heat drying, use ultraviolet (UV) radiation curing then, on carrier, form photothermal transformation layer.The same adhesive layer precursor that adopts spin-coating method will have composition shown in the last table 2 is coated on the wafer.In the vacuum bonding equipment shown in Fig. 2, glass substrate and wafer layer are forced together, use ultraviolet light irradiation then, the cured adhesive layer precursor, thus obtain layered product.The structure of this layered product is glass substrate/photothermal transformation layer/adhesive layer/silicon chip, and the thickness of photothermal transformation layer is 0.9 micron, and the thickness of adhesive layer is 100 microns, and bond area is 314 square centimeters.
Prepared layered product is placed in the milling apparatus shown in Fig. 3, in one current of input, the emery wheel of rotation is contacted with layered product, grind.Being ground to wafer thickness is 50 microns.On the lapped face of wafer, lay section adhesive tape and section framework then, layered product is sent on the fixed head of the permanent plant of layered product shown in Fig. 5, use vacuum equipment to reduce pressure, layered product is fixed on the fixed head with suction from downside.
According to the result of above-mentioned preliminary test, use YAG laser (wavelength is 1064 nanometers) to carry out laser irradiation, laser output is 6.0 watts, and beam diameter and scanning pitch all are 100 microns, and laser scanning speed is 1.0 meter per seconds.To tangential direction layered product is carried out the laser beam irradiation of linear reciprocation from the marginal portion of layered product.Adopt the whole surface of this method irradiation layered product.Fixedly on the glass plate of irradiation layered product aspirator is housed, it is picked up, just can be at an easy rate from the wafer the separation of glasses plate, make the wafer that has adhesive layer on it.
From wafer during the release adhesive layer, with the pressure sensing adhesive band (SCOTCH that obtains from 3M
TM#3305WaferDe-taping Tape) sticking on the surface of adhesive layer, and peel off with 180 ° direction, is 50 microns silicon chip thereby obtain thickness under the situation of not damaging wafer.
In the present embodiment, test according to the mode identical with embodiment 1, difference is to have carried out following change.Use has 20% solution (in propylene glycol methyl ether acetate) of the ratio of solids content shown in the following table 3 composition as the photothermal transformation layer precursor.And, in order to prevent during laser irradiation, to cause once more bonding because of the weight of glass substrate, should insert a L shaped crotch in the glass substrate marginal portion, and hang up, so just can prevent from during laser beam irradiation, to cause once more bonding because of the weight of glass substrate with spring.Similar to Example 1, can under the situation of not destroying wafer, obtain thickness and be 50 microns silicon chip.
Table 3: photothermal transformation layer
| ? | The solids content ratio |
| Raven?760 | 27.64％ |
| Disperbyk?161 | 13.82％ |
| Ebecryl?8804 | 50.49％ |
| Irgacure?369 | 7.00％ |
| Irgacure?184 | 1.05％ |
| Amount to | 100.00％ |
Raven 760 (Columbian Carbon Japan Ltd.): carbon black; Disperbyk 161 (BYKChemie): dispersant (being 30% in butyl acetate); Ebecryl 8804 (Daicel UCB): aliphatic carbamate diacrylate, MW=1400 (being 30% in toluene); Irgacure 369 (Ciba Specialty Chemicals K.K.): 2-benzyl-2-N, N-dimethylamino-1-(4-morpholino phenyl)-1-butanone; Irgacure 184 (also obtaining): 1-hydroxycyclohexylphenylketone from Ciba.
Embodiment 3:
In the present embodiment, test according to the mode identical with embodiment 2, difference be to use have solids content shown in the following table 4 than 10% solution of forming (in propylene glycol methyl ether acetate) as the photothermal transformation layer precursor.This photothermal transformation layer precursor is the polymer solution that contains carbon black, therefore can only form photothermal transformation layer by drying means.
Table 4: photothermal transformation layer
| ? | The solids content ratio |
| Raven?760 | 30.06％ |
| Disperbyk?161 | 15.03％ |
| UR8300 | 54.91％ |
| Amount to | 100.00％ |
Raven 760 carbon blacks; Disperbyk 161 dispersants; The UR8300 polyurethane polyester.
By with the embodiment identical operations, can under the situation of not destroying wafer, obtain thickness and be 50 microns silicon chip.
Comparative Examples 1:
Test according to the mode identical with embodiment 1, difference is to prepare does not thisly use photothermal transformation layer during by layered product that silicon chip/pressure sensing adhesive band/glass substrate is formed, and use double-faced pressure-sensitive adhesive tape (SCOTCH
TM#9415 high viscosity/low viscosity) substitutes adhesive layer, make more low-viscosity adhesive contact wafer.Can not peel off silicon chip.
Embodiment 4 to 10:
Below test according to the mode identical with embodiment 1 to 3, change the composition and the thickness of photothermal transformation layer, and among use and the embodiment 1 to 3 used same composition adhesive (high elastic modulus type adhesive) or have the adhesive (low elastic modulus type adhesive) of following composition.Bondline thickness is 50 microns.With silicon chip grinding to 25 micron thickness.The composition of the composition of photothermal transformation layer and thickness and adhesive layer is as shown in table 5 and 6 among each embodiment.In embodiment 4 to 6, mix silica as transparent filler.
Table 5: photothermal transformation layer A (containing silica)
| ? | Weight | Volume |
| Black?Pearls?130 | 25.0％ | 18.6％ |
| AEROSIL?380 | 22.0％ | 13.8％ |
| Disperbyk?161 | 7.5％ | 9.4％ |
| Joncryl?690 | 45.5％ | 58.3％ |
| Amount to | 100.0％ | 100.0％ |
Photothermal transformation layer B (containing silica)
| ? | Weight | Volume |
| Black?Pearls?130 | 25.0％ | 17.9％ |
| AEROSIL?380 | 16.5％ | 10.0％ |
| Disperbyk?161 | 7.5％ | 9.0％ |
| Joncryl?690 | 51.0％ | 63.1％ |
| Amount to | 100.0％ | 100.0％ |
Photothermal transformation layer C (containing silica)
| ? | Weight | Volume |
| Black?Pearls?130 | 25.0％ | 17.3％ |
| AEROSIL?380 | 11.0％ | 6.4％ |
| Disperbyk?161 | 7.5％ | 8.7％ |
| Joncryl?690 | 56.5％ | 67.5％ |
| Amount to | 100.0％ | 100.0％ |
Photothermal transformation layer D
| ? | Weight | Volume |
| Black?Pearls?130 | 65.0％ | 52.4％ |
| Disperbyk?161 | 32.5％ | 26.5％ |
| Joncryl?690 | 2.5％ | 21.1％ |
| Amount to | 100.0％ | 100.0％ |
Photothermal transformation layer E
| ? | Weight | Volume |
| Black?Pearls?130 | 45.0％ | 32.4％ |
| Disperbyk?161 | 22.5％ | 16.3％ |
| Joncryl?690 | 32.5％ | 51.3％ |
| Amount to | 100.0％ | 100.0％ |
Adhesive layer A (low elastic modulus)
| ? | Weight |
| UV?6100B | 38.1％ |
| HDODA | 25.4％ |
| HOA-MS | 31.7％ |
| Irgacure?369 | 4.8％ |
| Amount to | 100.0％ |
Adhesive layer B (high elastic modulus)
| ? | Weight |
| UV?6100B | 57.1％ |
| HDODA | 38.1％ |
| Irgacure?369 | 4.8％ |
| Amount to | 100.0％ |
The photothermal transformation layer material:
Black Pearls 130 (Cabot Corporation) carbon black; The EC600JD carbon black; AEROSIL 380 (Nippon Aerosil Co.) cilicon oxide filler; Joncryl 690 (Johnson Polymer Co.); Polyacrylate resin, acid number=240, MW=15500, Tg=102 ℃; Disperbyk 161 (BYK ChemieJapan Co., Ltd): dispersant; Solsperse 5000 (Zeneca Co., Ltd): dispersant.
Adhesion-layer materials:
UV-6100B (The Nippon Synthetic Chemical Industry Co., Ltd): propylene acidifying oligourethane, MW=6700, the Tg behind the ultra-violet curing are 0 ℃; HDODA (DaicelUCB Company Ltd.): 1, the 6-hexanediyl ester; HOA-MS (Kyoeisha ChemicalCo., Ltd) 2-acrylyl oxy-ethyl butanedioic acid; Irgacure 369 (Ciba Specialty ChemicalsK.K.) 2-benzyl-2-N, N-dimethylamino-1-(4-morpholino phenyl)-1-butanone.
Table 6:
All prepared two kinds of samples in each embodiment, a kind of use high elastic modulus adhesive is as adhesive layer, and the another kind of low elastic modulus adhesive that uses is as adhesive layer.
In the test, according to step separating wafer and glass substrate described in the embodiment 1.Test result is as shown in following table 7.
Table 7: from the power of separation layered product needs on glass
* 1: the value that records in wavelength 365 nanometers.
* the modulus of elasticity 2:25 ℃ the time is 320 MPas.
* the modulus of elasticity 3:25 ℃ the time is 10 MPas.
* 4:FVC (packing volume concentration); TFVC (the highest packing volume concentration) can determine from the voidage of filler under the drying regime, uses the filling needed amount of liquid in above-mentioned filler space (oil absorption) to determine.
* 5: adopt to prevent once more bonding method separating wafer and carrier at an easy rate.
As seen from the above table, when using high elastic modulus type adhesive layer, separation of glasses substrate and 25 microns wafers at an easy rate in embodiment 4 to 10.When using low elastic modulus type adhesive layer, all be not easy separation of glasses substrate and wafer in embodiment 6 and 8 to 10, the FVC/TFVC among these embodiment is 80% or littler.In embodiment 8, FVC/TFVC is 80% or bigger, but because the thickness less (0.3 micron) of photothermal transformation layer, thus can take place once more because the adhesive layer part is exposed to release surface bonding, the power that needs are bigger.In embodiment 6 and 8 to 10,, adopt with the identical adhesive bonding method (it being hung up) that prevents once more described in embodiment 2 and 3 to prepare specimen once more and test with L type crotch and spring according to the same way as in embodiment 2 and 3.At this moment, separation of glasses substrate and 25 microns wafers at an easy rate.In embodiment 4 and 5, not only used carbon black, also used silica, even FVC/TFVC is 80% or bigger, also can guarantees about 2% ultraviolet (365 nanometer) transmissivity, and can solidify the adhesive layer that has used UV curable adhesives at short notice.
Embodiment 11 to 14 (preferred in certain embodiments adhesive layer)
In these embodiments, the made layered product of the present invention that uses photothermal transformation layer shown in the following table and adhesive to form.
Table 8
| Chemical name | Trade name | Weight % |
| Urethane acrylate | UV7000B | 28.6％ |
| Urethane acrylate | UV6100B | 28.6％ |
| 1, the 6- |
1，6-HX-1 | 38.1％ |
| The photochemical reaction initator | Irgacure?369 | 4.8％ |
| Amount to | ? | 100.0％ |
| Chemical name | Trade name | Weight % |
| Urethane acrylate | UV7000B | 47.6％ |
| Two cyclopenta acrylate | FA513A | 19.0％ |
| 1, the 6- |
1，6-HX-A | 28.6％ |
| The photochemical reaction initator | Irgacure?369 | 4.8％ |
| Amount to | ? | 100.0％ |
Table 9: adhesive layer 3
| Chemical name | Trade name | Weight % |
| Urethane acrylate | UV6100b | 57.1％ |
| 1, the 6- |
1，6-HX-A | 38.1％ |
| The photochemical reaction initator | Irgacure?369 | 4.8％ |
| Amount to | ? | 100.0％ |
Table 10: photothermal transformation layer
| Chemical name | Trade name | Weight % |
| Carbon black | Sevacarb | 25.0％ |
| Silica | A200 | 32.5％ |
| Dispersant | Disperbyk?16 | 7.5％ |
| The acryloyl resin | Joncryl?690 | 35.0％ |
| Amount to | ? | 100.0％ |
Adhesive material:
UV-6100B (The Nippon Synthetic Chemical Industry Co., Ltd.) propylene acidifying oligourethane, MW=6700, Tg after the ultra-violet curing is 0 ℃ and UV-7000B (also obtaining from Nippon Synthetic Chem.) propylene acidifying oligourethane, Tg after the MW=3500, ultra-violet curing is 52 ℃; 1, and 6-HX-A (Kyoeisha Chemical Co., Ltd.); FA513A (Hitachi Chemical Co., Ltd.); HOA-MS (Kyoeisha Chemical Co., Ltd.); DCPA (Kyoeisha Chemical Co., Ltd.); Irgacure 369 (Ciba Specialty ChemicalsK.K.).
The photothermal transformation layer material:
Sevacarb(Columbian?Carbon?Japan?Ltd.)；Aerosil?200(Nippon?AerosilCo.)；Joncryl?690(Johnson?Polymer?Co.)；Disperbyk?161(BYK?ChemieJapan?Co.，Ltd.)。
When measuring the storage modulus of adhesive 1 to 3, the use size is 22.7 millimeters * 10 millimeters * 50 microns a sample, stretch mode, frequency is 1 hertz, and strain is 0.04%, and heating rate is 5 ℃/minute, use is from Rheometrics, the SOLIDS ANALYZER RSA II that Inc. obtains.The result is as shown in table 11.At the modulus of elasticity 50 ℃ time the shown in the table, the maximum temperature when suppose grinding is 50 ℃.And, the minimal elastic modulus that records when also being illustrated in 25 to 180 ℃ in the table.
Bonding strength when verifying adhesive as adhesive layer is measured the bonding strength (pattern of riving) of every kind of adhesive in accordance with the following methods.As shown in Figure 9, by suppressing quick bonding coated on both sides adhesive tape silicon chip 92 is fixed on the horizontal support platform 91.Coated area is 3.5 square centimeters a adhesive layer (adhesive 1) on silicon chip 92, and drying is also carried out photocuring, and formation thickness is 50 microns adhesive layer 93.The L shaped measured material 94 that with contact area is 3.5 square centimeters is bonded on the adhesive layer 93 of curing by pressure-sensitive adhesion coated on both sides adhesive tape.Perpendicular ends in L shaped measured material 94 connects an one metal wire, hangs counterweight 95, applies tensile force in the horizontal direction, and moves counterweight with 20 millimeters/minute draw speed.Load during fracture is the bonding strength shown in the table 11 (pattern of riving).And, carry out heat treatment in advance (140 ℃, 3 minutes) and recover bonding strength.Bonding strength after the heat treatment in advance is also as shown in table 11.
Embodiment 11:
Is that 50 microns adhesive 1 carries out lamination and uses ultraviolet light polymerization with silicon chip with the top glass substrate that is coated with photothermal transformation layer by thickness.Bond area is 314 square centimeters.Being 25 microns, use dry tumbling equipment to remove damaged layer (about 2 microns) with mill then for wafer face to the wafer thickness that grinds laminate samples under the condition of grinding water.With die molding adhesive tape simulation heat pressure adhesive, the sample that makes was placed 3 minutes on 180 ℃ hot plate.And, carry out laser irradiation from glass side, remove glass substrate, then release adhesive.Grinding condition is as follows.
(1) milling apparatus: by the DFG850E type of DISCO manufacturing
(2) grinding condition:
| ? | Corase grind | Grind at last |
| Wafer thickness | 750 to 60 |
60 to 25 microns |
| Emery wheel number (JIS#) | 380 | 2000 |
| The revolutions per minute of emery wheel (rev/min) | 4800 | 5500 |
Embodiment 12:
Adopt the step identical with embodiment 11 to test, difference is to use adhesive 2, and after lamination, places 3 minutes in 140 ℃ baking oven grinding preceding sample, with this as heat treatment in advance.
Embodiment 13:
Adopt the step identical to test, distinguish and be to use adhesive 3, and adhesive thickness is changed into 25 microns with embodiment 11.
Embodiment 14:
Adopt the step identical to test, distinguish and be to use adhesive 3, and the grinding final thickness of wafer is changed into 50 microns with embodiment 11.
As can be known from Table 11, even being ground to when grinding under 150 microns identical conditions with routine, also the edge fragmentation can not occur when grinding, perhaps water enters the problem at interface between wafer and the adhesive layer.After heat treatment in advance, can obtain sufficiently high bonding strength, and can not take place because the bonding strength of adhesive layer increases and the problem that can not separate adhesive layer from wafer after the heat treatment in advance.This demonstration, remove (such as, use the method for chemially etching of chemicals, use slurry to carry out the CMP method of machinery and chemical polishing, when the dry tumbling method of perhaps not using chemicals to polish) remaining in damaged layer on the wafer (because grinding rather than layer that monocrystal damages) after grinding, the also phenomenon that edge breakage can not occur or peel off.
Embodiment 15 and 16 (layered product that contains extra play):
In these embodiments, made the layered product that contains first intermediate layer and second intermediate layer.
Use following material as photothermal transformation layer, second intermediate layer, contact adhesive, Photocurable adhesive, printing opacity carrier (glass substrate) and substrate to be ground.
Table 12: photothermal transformation layer
| Chemical name | Trade name | Weight % |
| Carbon black | Sevacarb | 25.0％ |
| Silica | A200 | 32.5％ |
| Dispersant | Disperbyk?16 | 7.5％ |
| The acryloyl resin | Joncryl?690 | 35.0％ |
| Amount to | ? | 100.0％ |
Table 13: second intermediate layer
| Chemical name | Trade name | Weight % |
| Urethane acrylate | UV7000B | 47.6％ |
| Two cyclopenta acrylate | FA513A | 47.6％ |
| The photochemical reaction initator | Irgacure?369 | 4.8％ |
| Amount to | ? | 100.0％ |
Table 14: contact adhesive
| Chemical name | Trade name | Weight % |
| Polyurethane polyester | UR8700 | 25.0％ |
| Polyurethane polyester | UR3200 | 75.0％ |
| Amount to | ? | 100.0％ |
Glass substrate: TENPAX heat resistant glass
Table 15: Photocurable adhesive
| Chemical name | Trade name | Weight % |
| Urethane acrylate | UV6100B | 57.1％ |
| 1, the 6- |
1，6-HX-A | 38.1％ |
| The photochemical reaction initator | Irgacure?369 | 4.8％ |
| Amount to | ? | 100.0％ |
Material to be ground: thickness is 750 microns silicon chip.
Raw material (precursor):
Sevacarb (Columbian Carbon Japan Ltd.); Aerosil 200 (Nippon AerosilCo.); Disperbyk 161 (BYK Chemie Japan Co., Ltd.); Joncryl 690 (JohnsonPolymer Co.); UV7000B, and UV6100B (The Nippon Synthetic Chemical IndustryCo., Ltd.); FA513A (Hitachi Chemical Co., Ltd.); 1, and 6-HX-A (KyoeishaChemical Co., Ltd.); Irgacure 369 (Ciba Specialty Chemicals K.K.); UR8700: urethane-modified mylar, MW=32000, Tg=-22 ℃.Fracture strength＜double centner/square centimeter, elongation at break 1000%; UR3200: urethane-modified mylar, MW=40000, Tg=-3 ℃, fracture strength＜double centner/square centimeter, elongation at break 700% (all from Toyobo Co., Ltd. obtains).
Embodiment 15:
A) preparation layered product
At 50 microns PETGs (PET) film (TEIJIN O Film, make by TejinLtd.) (corresponding to the intermediate layer among Fig. 1 (f)) upward coating photothermal transformation layer (1 micron) is also dry, applies intermediate layer (corresponding to second intermediate layer 9 among Fig. 1 (f)) (30 microns) and drying in the above.And, apply contact adhesive (10 microns) in the above, make pressure-sensitive adhesion single face coating adhesive tape.Then, use cylinder that this adhesive tape and glass substrate are carried out lamination, obtain glass substrate/pressure-sensitive adhesive layer/second intermediate layer/photothermal transformation layer/PET film (first intermediate layer).
In addition, on a silicon chip, apply Photocurable adhesive.Then, this silicon wafer layer is pressed on the exposure PET film surface of glass substrate/pressure-sensitive adhesive layer/second intermediate layer/photothermal transformation layer/PET film (first intermediate layer) product by Photocurable adhesive, and from glass substrate side ultraviolet light irradiation, cure adhesive.The bond area of this layered product is 314 square centimeters.
B) grinding back surface
With the silicon chip grinding back surface to 50 in the layered product micron.
C) separation of glasses substrate
The grinding wafers surface that makes layered product is sticked on the section adhesive tape, be fixed on the vacuum chuck table then.Then, and use YAG laser (output: 7 watts, wavelength:, go up separation of glasses substrate and contact adhesive/second intermediate layer from PET film (first intermediate layer) 1064 nanometers) from the whole surface of glass substrate side irradiation.
D) separate adhesive layer
With pressure sensing adhesive band (SCOTCH
TM#3305 obtains from 3M) be bonded on the exposed surface of first intermediate layer (PET film), and upwards pull, remove film and adhesive layer from wafer substrate.
E) the detaching pressure-sensitive adhesive and second intermediate layer
(#3305) is bonded on the exposed surface in second intermediate layer with the pressure sensing adhesive band, and upwards pulls, and integral body is removed intermediate layer and contact adhesive from the glass substrate.
The result:
Proof can removed adhesive layer and film under the situation that adhesive layer is broken together on wafer surface.On wafer surface, do not observe residual glue etc.
Also proof can be removed intermediate layer and contact adhesive from integral body on the glass substrate surface.This glass substrate can be reused after cleaning with ethanol and pure water.
Embodiment 16:
Make layered product and test according to the mode identical with embodiment 15, difference is to use multilayer optical film (3M
TMSolar Reflecting Film obtains from 3M) alternative PET film.
The result:
Proof can removed adhesive layer and film under the situation that adhesive layer is broken together on wafer surface.On wafer surface, do not observe residual glue etc.
Also proof can be removed intermediate layer and contact adhesive from glass substrate surface integral body.This glass substrate can be reused after cleaning with ethanol and pure water.And; because used multilayer optical film transmissive makes Photocurable adhesive solidify to form the required light of adhesive layer and can reflected radiation can handle required laser; so curable adhesive layer and any problem can not take place; and can protect simultaneously circuit diagram on the wafer, it can be damaged because being subjected to laser.
Use lamination physical efficiency of the present invention under the situation of not damaging substrate, to be milled to extremely thin substrate from the carrier separation.By radiant energy carrier of separating and substrates such as laser beams, just can be at an easy rate from the substrate the release adhesive layer, can under the situation of not damaging substrate, make ultrathin substrate.
Claims (16)
1. layered product, it comprises:
Substrate to be ground;
The adhesive layer that contacts with described substrate;
Be positioned at the photothermal transformation layer of this adhesive layer below, but it contains optical absorbing agent and heat decomposable resin; With
Be positioned at the printing opacity carrier of this photothermal transformation layer below;
But the radiant energy that puts on photothermal transformation layer causes heat decomposable resin generation thermal decomposition, and the gas that thermal decomposition produces is with the photothermal transformation layer separated into two parts, thus carrier of separating and substrate;
But described heat decomposable resin is selected from: the copolymer of polyurethane, polyester, poe, PVP, vinylidene chloride and acrylonitrile, organic siliconresin, the block copolymer that contains the polyurethane unit or its combination.
2. layered product as claimed in claim 1 is characterized in that described substrate is a fragile material.
3. layered product as claimed in claim 1 is characterized in that described substrate is a silicon chip.
4. layered product as claimed in claim 1 is characterized in that described optical absorbing agent comprises carbon black.
5. layered product as claimed in claim 1 is characterized in that described photothermal transformation layer also contains transparent filler.
6. layered product as claimed in claim 5 is characterized in that described transparent filler is a silica.
7. layered product as claimed in claim 5 is characterized in that described optical absorbing agent is a carbon black, and the total amount of carbon black and described transparent filler described in the described photothermal transformation layer accounts for 5 to 70% of described photothermal transformation layer volume.
8. layered product as claimed in claim 5 is characterized in that described optical absorbing agent is a carbon black, the total amount of carbon black and described transparent filler described in the described photothermal transformation layer be the highest packing volume concentration 80% or more.
9. layered product as claimed in claim 1 is characterized in that described photothermal transformation layer contains the carbon black that accounts for described photothermal transformation layer volume 5 to 70%.
10. layered product as claimed in claim 1 is characterized in that described carrier is a glass.
11. layered product as claimed in claim 1 is characterized in that described adhesive layer is a kind of Photocurable adhesive.
12. layered product as claimed in claim 1, it also comprises first intermediate layer between described adhesive layer and described photothermal transformation layer.
13. layered product as claimed in claim 12 is characterized in that described first intermediate layer is a multilayer optical film.
14. as each described layered product in the claim 1 to 13, it is characterized in that second intermediate layer between described photothermal transformation layer and described printing opacity carrier, described second intermediate layer and described printing opacity carrier are bonding by another adhesive layer.
15. the method for each described layered product in manufacturing such as the claim 1 to 14, described method comprises:
But but on the printing opacity carrier, apply the solution contain optical absorbing agent and heat decomposable resin or as the monomer of the precursor material of heat decomposable resin or the photothermal transformation layer precursor of oligomer;
Drying is hardened or is solidified described photothermal transformation layer precursor, forms photothermal transformation layer on described printing opacity carrier;
Adhesive application on substrate to be ground or photothermal transformation layer, is formed adhesive layer; With
Under reduced pressure,, form layered product by bonding described substrate to be ground of described adhesive layer and described photo-thermal conversion coating.
16. a method of making thin substrate, it comprises:
Preparation is as each described layered product in the claim 1 to 14;
Grind described substrate to required thickness;
By the described photothermal transformation layer of described printing opacity carrier irradiation, described photothermal transformation layer is decomposed, thereby after grinding, separate described substrate and described printing opacity carrier; With
Peel off described adhesive layer from described substrate after grinding.
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| JP2002161846 | 2002-06-03 | ||
| JP161846/2002 | 2002-06-03 | ||
| JP350247/2002 | 2002-12-02 | ||
| JP2002350247A JP4565804B2 (en) | 2002-06-03 | 2002-12-02 | Laminate including ground substrate, method for producing the same, method for producing ultrathin substrate using laminate, and apparatus therefor |
| PCT/US2003/017236 WO2004006296A2 (en) | 2002-06-03 | 2003-06-02 | Laminate body and corresponding methods and apparatus |
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| CN1703773B true CN1703773B (en) | 2011-11-16 |
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| JP5048707B2 (en) | 2012-10-17 |
| JP2009155652A (en) | 2009-07-16 |
| CN1703773A (en) | 2005-11-30 |
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