US20050166843A1 - Apparatus for fabricating a conformal thin film on a substrate - Google Patents
Apparatus for fabricating a conformal thin film on a substrate Download PDFInfo
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- US20050166843A1 US20050166843A1 US11/050,201 US5020105A US2005166843A1 US 20050166843 A1 US20050166843 A1 US 20050166843A1 US 5020105 A US5020105 A US 5020105A US 2005166843 A1 US2005166843 A1 US 2005166843A1
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- shield
- gas
- diffuser plate
- reaction chamber
- substrate
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45544—Atomic layer deposition [ALD] characterized by the apparatus
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45563—Gas nozzles
- C23C16/45565—Shower nozzles
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45587—Mechanical means for changing the gas flow
- C23C16/45591—Fixed means, e.g. wings, baffles
Definitions
- the present invention generally relates to film deposition, and more particularly to an apparatus for fabricating a conformal thin film on a substrate.
- Atomic layer deposition also known as sequential pulsed chemical vapor deposition (SP-CVD), atomic layer epitaxy (ALE) and pulsed nucleation layer (PNL) deposition
- SP-CVD sequential pulsed chemical vapor deposition
- ALE atomic layer epitaxy
- PNL pulsed nucleation layer
- ALD techniques support deposition of conformal thin layers
- a drawback of the technique is the low average deposition rate, which is related to the need to repeat several cycles having finite durations.
- the repeated cycle of precursor and reactant adsorption and the intervening chamber purges is time consuming, which results in reduced throughput relative to conventional deposition techniques.
- an ALD sequence includes at least two purge pulses and these purge pulses are typically the most time consuming portion of the ALD sequence. Therefore, improvements in ALD equipment have focused on techniques to decrease the time needed to complete a purge pulse.
- the most logical solution to decreasing the duration of the purge pulse is to flow the purge gas at higher speeds through the reactor, which may be achieved by increasing the flow rate of the purge gas.
- Typical flow rates used in the industry are several standard liters per minute (SLM) (e.g., approximately 2.5 SLM) at pressures of between approximately 0.2 and approximately 20 Torr. These flow rates lead to substantially higher gas flow speeds than obtained in conventional CVD processes.
- SLM standard liters per minute
- the turbulence occurs in an expansion zone of a gas injector near an inlet used to supply the purge gas.
- Turbulence in the expansion zone may cause the flow pattern of the purge gas across a conventional diffuser plate to be altered. Specifically, the fraction of the total flow passing through the openings in the diffuser plate located near the turbulent zone decreases significantly. The decrease in gas flow through openings near the turbulent zone when compared to the gas flow through openings located away from the turbulent zone may create an uneven distribution of precursor during a doping pulse, which ultimately forms a non-uniform film on a substrate. Additionally, recirculation of gas in the expansion zone caused by the turbulence leads to inefficient purging of the precursors from the expansion zone, which may cause gas phase reactions that form a powder in the expansion zone.
- an apparatus for fabricating conformal thin films on a substrate that include a diffuser plate having a protrusion that reduces turbulence in an expansion volume associated with a gas injector.
- a method for fabricating conformal thin films on a substrate includes introducing a gas from a gas inlet into an expansion volume associated with an atomic layer deposition (ALD) system.
- the gas is flowed through a diffuser plate adjacent to the expansion volume and a reaction chamber.
- the diffuser plate includes a protrusion located opposite the gas inlet, which reduces turbulence in the expansion volume.
- an apparatus for fabricating conformal thin films on a substrate includes a reaction chamber and a gas injector located adjacent to the reaction chamber.
- the gas injector includes an expansion volume and a gas inlet for introducing a gas into the expansion volume.
- a diffuser plate is located adjacent to the expansion volume and the reaction chamber.
- a protrusion that reduces turbulence in the expansion volume is located adjacent to the diffuser plate and opposite the gas inlet.
- an apparatus for fabricating conformal thin films on a substrate includes a reaction chamber and a gas injector located adjacent to the reaction chamber.
- the gas injector includes an expansion volume and a gas inlet for introducing an inert gas into the expansion volume.
- a diffuser plate located adjacent to the expansion volume and the reaction chamber includes a bevel that is located opposite the gas inlet, and reduces turbulence and gas phase reactions in the expansion volume.
- the diffuser plate includes a protrusion located opposite a gas inlet of a gas injector.
- the protrusion prevents gas flowing from the gas inlet from bouncing off the surface of the diffuser plate and recirculating in an area around the gas inlet. The protrusion, therefore, facilitates laminar gas flow in an expansion volume of a gas injector associated with an ALD system.
- the diffuser plate includes a protrusion that facilitates laminar gas flow throughout an expansion volume of a gas injector.
- the laminar gas flow allows the gas during a purge pulse of an ALD process to remove residual precursor from the expansion volume. By more effectively removing the precursor, gas phase reactions during a subsequent purge pulse may be reduced or even eliminated, thus decreasing the frequency of cleaning processes.
- a further important technical advantage of certain embodiments of the present invention includes a diffuser plate that uniformly distributes a precursor in a reaction chamber.
- a precursor combined with a gas may be flowed through the diffuser plate.
- a protrusion on the diffuser plate facilitates a laminar gas flow within an expansion volume. Because gas/precursor mixture flows in a laminar manner within the expansion volume, the gas/precursor mixture flows more uniformly through openings in the diffuser plate. The uniform flow of the mixture provides for an improved distribution of precursor over a substrate in the reaction chamber and ultimately allows a substantially uniform film to be formed on the substrate.
- FIG. 1 illustrates an atomic layer deposition (ALD) system for forming a conformal thin film on a substrate according to teachings of the present invention
- FIGS. 2A and 2B illustrate flow patterns in a gas injector at different flow rates using a conventional diffuser plate
- FIGS. 3A and 3B illustrate flow patterns over a substrate at different flow rates using a conventional diffuser plate
- FIG. 4 illustrates an example embodiment of a gas injector associated with an ALD system according to teachings of the present invention
- FIG. 5 illustrates another example embodiment of a gas injector associated with an ALD system according to teachings of the present invention
- FIGS. 6 a and 6 b respectively illustrate a top view and a bottom view of an example embodiment of a diffuser plate including protrusions formed on a top surface according to teachings of the present invention.
- FIG. 7 illustrates a gas injector flow pattern using a beveled diffuser plate according to teachings of the present invention.
- FIGS. 1 through 7 Preferred embodiments of the present invention and their advantages are best understood by reference to FIGS. 1 through 7 , where like numbers are used to indicate like and corresponding parts.
- the conceptual groundwork for the present invention involves an atomic layer deposition (ALD) process to create highly conformal thin films.
- ALD atomic layer deposition
- individual precursors are pulsed onto the surface of a substrate contained in a reaction chamber, without mixing the precursors in the gas phase.
- Each precursor reacts with the surface of the substrate to form an atomic layer in such a way that only one layer forms at a time.
- the introduction of the precursor into the reaction chamber may be known as a doping pulse.
- the reaction chamber may be purged by flowing a gas over the substrate. The time needed to complete the doping and purge pulses may depend on the flow rate of the precursor or the purge gas.
- the precursor or purge gas flows from a gas injector, through a diffuser and into the reaction chamber.
- the diffuser may include a flat surface having multiple openings to allow the precursor or purge gas to flow into the reaction chamber. If the flow rate of the purge gas during the purge pulse is above a specific level, turbulence may occur near the gas inlet in the injector.
- the present invention provides a protrusion associated with the diffuser that reduces and even eliminates turbulence in the gas injector. The protrusion may be located opposite the gas inlet such that the purge gas flows over the protrusion and through the openings in the diffuser in a more uniform manner.
- FIG. 1 illustrates atomic layer deposition (ALD) system 10 for forming a conformal thin film on a substrate.
- ALD system 10 includes diffuser plate 12 , gas lines 14 a and 14 b (generally referred to as gas lines 14 ), gas injector 16 , reaction chamber 18 and outlet 20 .
- gas lines 14 a and 14 b generally referred to as gas lines 14
- gas injector 16 gas injector 16
- reaction chamber 18 reaction chamber 22
- outlet 20 atomic layer deposition
- a gas may flow through one or both of gas lines 14 a and 14 b from gas reservoirs.
- the gas then flows through diffuser plate 12 included in gas injector 16 .
- a protrusion may be located opposite the gas inlet. The protrusion functions to direct the gas within gas injector 16 such that the gas flows in a laminar manner over a wide range of flow rates.
- ALD system 10 may include one or more gas reservoirs (not expressly shown) connected to gas injector 16 by gas lines 14 .
- the reservoirs may contain an inert gas that is used to remove precursor from gas injector 16 during a purge pulse and/or that is combined with a precursor during a doping pulse.
- the reservoirs may contain a precursor used during a doping pulse.
- Gas lines 14 may feed the gas into gas injector 16 .
- gas lines 14 may be formed of stainless steel and have a diameter of approximate one-quarter (1 ⁇ 4) inch.
- Reaction chamber 18 may contain substrate holder 19 .
- a substrate placed in substrate holder 19 may be a p-type or n-type silicon substrate.
- the substrate may be formed from gallium arsenide or any other suitable material that may be used as a substrate on which one or more layers of material may be deposited.
- the one or more layers deposited by ALD system 10 may form films used to fabricate conformal barriers, high-k dielectrics, gate dielectrics, tunnel dielectrics and barrier layers for semiconductor devices. ALD films are also thermally stable and substantially uniform, which makes them attractive for optical applications.
- ALD atomic layer deposition
- MEM MicroElectroMechanical
- the thin film may be formed on a substrate by alternately flowing one or more precursors combined with an inert gas (e.g., a doping pulse) and the inert gas (e.g., a purge pulse) through reaction chamber 18 .
- the precursor may react with the surface of the substrate to form a single layer of film.
- the doping and purge pulses may be repeated until a thin film having the desired thickness is formed on the substrate.
- the gas and precursor may be removed from reaction chamber 18 through outlet 20 by a pump (not expressly shown).
- the gas from the reservoirs expands into an area contained in gas injector 16 .
- the flow rate of the gas is high enough (e.g., greater than approximately 500 sccm)
- turbulence may occur due to the flat surface of a diffuser plate located opposite the gas inlet of gas injector 16 .
- the turbulence prevents the gas in a purge pulse from completely clearing the precursor from gas injector 16 because the precursor may be trapped in the turbulence, which may lead to gas phase reactions during subsequent pulses that form a powder in gas injector 16 .
- the turbulence may decrease the total flow of gas passing through openings in the diffuser plate located near the turbulent zone.
- the expansion volume located in gas injector 16 may include a protrusion located opposite the gas inlet.
- the protrusion may be integral to diffuser plate 12 located between gas injector 16 and reaction chamber 18 .
- the protrusion may be separate from diffuser plate 12 and mounted to one of the walls associated with gas injector 16 .
- the protrusion may be beveled and the surfaces forming the bevel may have similar or different slopes.
- the protrusion may include several sloped segments having different slopes or a surface with a smoothly varying slope.
- the protrusion functions to reduce and even eliminate turbulence at typical gas flow rates (e.g., approximately 2500 sccm and greater) for an ALD process by directing the flow of the gas through gas injector 16 such that the flow is uniform through each of the openings in the diffuser plate. Additionally, the protrusion may prevent gas phase reactions from occurring in gas injector 16 because the purge pulse more effectively removes the precursor from gas injector 16 .
- FIGS. 2A and 2B illustrate flow patterns inside of a gas injector at different flow rates using a conventional diffuser plate.
- FIG. 2A illustrates the flow pattern of a gas inside gas injector 30 at a flow rate of approximately 100 sccm.
- a gas may be introduced into gas injector 30 through gas inlet 32 .
- the gas flows substantially uniformly over diffuser plate 34 .
- no turbulence is present due to the low flow rate and the gas may flow through openings 36 in a uniform manner.
- turbulent zones may occur near gas inlet 32 .
- the turbulence causes a drop in pressure, which causes the flow through openings 36 located opposite gas inlet 32 to be lower than openings 36 located away from gas inlet 32 .
- the pressure in the gas injector near the turbulent zones is lower than the pressure in the reaction chamber, the gas may actually be sucked from the reaction chamber into the gas injector.
- the different flow through openings 36 may cause an uneven distribution of the precursor during the doping pulse.
- the recirculation in the turbulent zones may lead to inefficient purging of the precursor in gas injector 30 , which may cause gas phase reactions that produce powder in gas injector 30 .
- the powder may damage the substrate contained in the reaction chamber and create a need to clean the ALD system more often.
- FIGS. 3A and 3B illustrate flow patterns over a substrate at different flow rates using a conventional diffuser plate.
- FIG. 3A shows the flow pattern of a gas above a substrate (not expressly shown) at a flow rate of approximately 133 sccm as calculated by a commercially available computational flow dynamics software (e.g., software developed and sold by CFDRC corporation of Huntsville, Ala.).
- the gas flows substantially uniformly from gas injector 40 over the substrate to outlet 42 .
- FIG. 3B shows the flow pattern of the gas at a flow rate of approximately 1333 sccm (e.g., a rate approximately ten times greater than the flow rate illustrated in FIG. 3A ).
- the gas flow over the substrate is substantially different at the higher flow rate, especially in the region directly opposite the gas inlet (not expressly shown) in gas injector 40 .
- a conventional diffuser plate may induce turbulence in the region of gas injector 40 near the gas inlet.
- the turbulence may reduce the amount of gas flowing through the openings in the diffuser plate that are located opposite the gas inlet. The difference in the flow pattern through the openings in the diffuser plate may cause non-uniform distribution of the precursor over the substrate.
- FIG. 4 illustrates an example embodiment of a diffuser plate including a protrusion located opposite a gas inlet in a gas injector associated with an ALD system.
- Gas line 14 may include fast valving system 51 located near gas inlet 53 of gas injector 16 .
- Fast valving system 51 may include several subcomponents, such as mass flow controllers and on/off valves to control the flow versus time profiles of the dosing and purge pulses.
- a gas may flow through fast valving system 51 into expansion volume 52 via gas inlet 53 .
- the flow of gas from expansion volume 52 to reaction chamber 18 may be restricted by diffuser plate 12 .
- diffuser plate 12 may be a metal plate including at least one opening 56 .
- the number, size and position of openings 56 may be selected to obtain uniform precursor flow in reaction chamber 18 during a doping pulse and uniform gas flow during a purge pulse.
- Diffuser plate 12 may further be disposable since prolonged use may lead to deposition of the precursor in openings 56 and subsequent alteration of flow characteristics over time.
- diffuser plate 12 includes protrusion 58 located opposite gas inlet 53 .
- Protrusion 58 may direct the gas flowing into expansion volume 52 such that the gas flows uniformly through each of openings 56 into reaction chamber 18 through openings 56 .
- the height of protrusion 58 may scale with the size of gas inlet 53 and a desired operation range for the flow rate. In general, the size of gas inlet 53 and the flow rate may depend on the size of the substrate, as larger amounts of precursor may be used for larger substrates.
- the substrate may have a diameter of approximately 150 millimeters and protrusion 58 may have a height between approximately three millimeters (3 mm) and approximately eight millimeters (8 mm).
- Protrusion 58 may include surfaces 57 and 59 that form a bevel.
- surfaces 57 and 59 may have approximately the same length and slope.
- one of surfaces 57 and 59 may have a larger slope and/or length than the other surface.
- protrusion 58 may be formed in the shape of an inverted “U” such that the surface of protrusion 58 has a smoothly varying slope.
- protrusion 58 may include more than two sloped segments where the sloped segments have the same or different slopes and lengths.
- Surface 57 may form a first angle ( ⁇ 1 ) with respect to the surface of diffuser plate 12 and surface 59 may form a second angle ( ⁇ 2 ) with respect to the surface of diffuser plate 12 .
- the first and second angles ( ⁇ 1 and ⁇ 2 ) may be between approximately thirty degrees (30°) and approximately sixty degrees (60°).
- the first and second angles ( ⁇ 1 and ⁇ 2 ) may be approximately equal or one of the angles may be greater or less than the other angle.
- Protrusion 58 functions to direct the gas flow toward openings 56 in diffuser plate 12 such that the amount of gas flowing through each of openings 56 is approximately equal.
- Protrusion 58 may further function to eliminate turbulence in expansion volume 52 by preventing the gas from bouncing off of the surface of diffuser plate 12 towards gas inlet 53 , which further prevents recirculation from occurring near gas inlet 53 .
- the precursor may be more efficiently purged from expansion volume 52 during the purge pulse, which reduces the possibility of gas phase reactions that may form a powder in expansion volume 52 after prolonged use of ALD system 10 .
- protrusion 58 may be separate from diffuser plate 12 .
- Protrusion 58 may be mounted in expansion volume 52 such that protrusion 58 is located opposite gas inlet 53 .
- protrusion 58 may be located on a post mounted to one of the walls of expansion volume 52 .
- the post may have a width or diameter less than or equal to the base of protrusion 58 .
- the post may have a shape similar to that of protrusion 58 in order to further aid the flow of gas in expansion volume 52 .
- a wall protrusion similar to protrusion 58 located on diffuser plate 12 , may be formed on at least one of the walls forming expansion volume 52 .
- the wall protrusion may be formed on at least one of the walls in order to provide a more uniform gas flow through expansion volume 52 and to further reduce turbulence at higher flow rates.
- the wall protrusion may have one or more surfaces. In one embodiment, the surfaces may have approximately the same lengths and/or slopes. In other embodiments, the surfaces of the wall protrusion may have different lengths and/or slopes. In further embodiments, the surface of the wall protrusions may form an inverted “U”.
- FIG. 5 illustrates another example embodiment of a diffuser plate including a protrusion located opposite a gas inlet in a gas injector associated with an ALD system.
- gas inlet 53 may be located at the top of expansion volume 52 , rather than the center as illustrated in FIG. 4 .
- Diffuser plate 12 may include protrusion 60 that functions to direct the gas flow toward the bottom of expansion volume 52 .
- protrusion 60 may be separate from diffuser plate 12 and formed on the wall of expansion volume 52 .
- Protrusion 60 may form an angle ( ⁇ ) with respect to the surface of diffuser plate 12 of approximately thirty degrees (30°) to approximately sixty degrees (60°).
- Protrusion 60 may allow the gas flow to be evenly distributed through openings 56 such that a precursor is evenly distributed in reaction chamber 18 .
- protrusion 60 is illustrated as having a single surface adjacent to a wall of expansion volume 52 , protrusion 60 may also have multiple surfaces.
- gas inlet 53 may be located in a slightly asymmetrical position relative to the walls of expansion volume 52 .
- Protrusion 60 may include at least two surfaces, where the surface extending toward the larger portion of expansion volume 52 may have a greater length than the surface extending toward the smaller area of expansion volume 52 .
- FIGS. 6 a and 6 b respectively illustrate a top view and a bottom view of an example embodiment of diffuser plate 12 including protrusions 58 a and 58 b.
- ALD system 10 may include gas lines 14 a and 14 b.
- gas lines 14 a and 14 b may include a corresponding gas inlet and when diffuser plate 12 is used in ALD system 10 , protrusions 58 a and 58 b may be respectively located opposite the gas inlets for gas lines 14 a and 14 b.
- protrusions 58 a and 58 b may respectively prevent turbulence from forming near the gas inlets associated with gas lines 14 a and 14 b.
- diffuser plate 12 may include any suitable number of protrusions 58 such that at least one protrusion is located opposite each of the gas inlets associated with the expansion volume of a gas injector.
- diffuser plate 12 includes two rows of openings 56 formed on a front surface. As described above in reference to protrusions 58 a and 58 b, the two rows of openings 56 may correspond to the number of gas inlets associated with the expansion volume. In other embodiments, diffuser plate 12 may include one row or greater than two rows of openings 56 where the number of rows depends on the number of gas inlets associated with the expansion volume of the gas injector.
- diffuser plate 12 may include chamber openings 54 formed on a back surface. Chamber openings 54 may be located adjacent to reaction chamber 18 when diffuser plate 12 is included in ALD system 10 illustrated in FIG. 1 . In order to ensure that the precursor and gas enters reaction chamber 18 through each one of openings 56 at the same location, openings 56 may be interleaved in diffuser plate 12 to form a single row of chamber openings 54 . In the illustrated embodiment, openings 56 may be formed in diffuser plate 12 at a forty-five degree angle with respect to the normal of the surface of diffuser plate 12 . In other embodiments, openings 56 may be formed in diffuser plate 12 at a suitable angle such that each of openings 56 forms a single corresponding chamber opening 54 . In a further embodiment, the number of rows of chamber openings 54 formed on a back surface of diffuser plate 12 may be equal to the number of rows of openings 56 formed on a front surface of diffuser plate 12 .
- FIG. 7 illustrates a gas injector flow pattern using a beveled diffuser plate.
- the flow rate is approximately 8000 sccm.
- protrusion 58 may facilitate a laminar gas flow at a flow rate approximately sixteen (16) times greater than the flow rate at which the conventional diffuser plate illustrated in FIG. 2B shows significant turbulence.
- the gas therefore, may be evenly distributed through each of openings 56 and the precursor distribution in reaction chamber 18 may be improved.
Abstract
An apparatus for fabricating a conformal thin film on a substrate are disclosed. The apparatus includes a top shield having a top surface and a bottom surface and a bottom shield having an aperture formed therein and a thickness. The bottom shield is coupled to the bottom surface of the top shield such that the top shield covers the aperture. The apparatus further includes a substrate holder that may hold a substrate. The substrate holder is in contact with the bottom shield such that a reaction chamber is formed having a volume defined by the aperture and the thickness of the bottom shield.
Description
- This application is a continuation of U.S. patent application Ser. No.
b 10/706,637, filed Nov. 12, 2003 and entitled “METHOD AND APPARATUS FOR FABRICATING A CONFORMAL THIN FILM ON A SUBSTRATE” now U.S. Pat. No. ______. - The present invention generally relates to film deposition, and more particularly to an apparatus for fabricating a conformal thin film on a substrate.
- Atomic layer deposition (ALD), also known as sequential pulsed chemical vapor deposition (SP-CVD), atomic layer epitaxy (ALE) and pulsed nucleation layer (PNL) deposition, has gained acceptance as a technique for depositing thin and continuous layers of metals and dielectrics with high conformality. In an ALD process, a substrate is alternately dosed with a precursor and one or more reactant gases so that reactions are limited to the surface of a substrate. Uniform adsorption of precursors on the wafer surface during the ALD process produces highly conformal layers at both microscopic feature length scales and macroscopic substrate length scales, and achieves a high density of nucleation sites. These attributes result in the deposition of spatially uniform, conformal, dense and continuous thin films.
- Although ALD techniques support deposition of conformal thin layers, a drawback of the technique is the low average deposition rate, which is related to the need to repeat several cycles having finite durations. For example, the repeated cycle of precursor and reactant adsorption and the intervening chamber purges is time consuming, which results in reduced throughput relative to conventional deposition techniques. Specifically, an ALD sequence includes at least two purge pulses and these purge pulses are typically the most time consuming portion of the ALD sequence. Therefore, improvements in ALD equipment have focused on techniques to decrease the time needed to complete a purge pulse.
- The most logical solution to decreasing the duration of the purge pulse is to flow the purge gas at higher speeds through the reactor, which may be achieved by increasing the flow rate of the purge gas. Typical flow rates used in the industry are several standard liters per minute (SLM) (e.g., approximately 2.5 SLM) at pressures of between approximately 0.2 and approximately 20 Torr. These flow rates lead to substantially higher gas flow speeds than obtained in conventional CVD processes.
- One of the effects of increasing purge gas flow speed is the occurrence of turbulence in the gas injector. Typically, the turbulence occurs in an expansion zone of a gas injector near an inlet used to supply the purge gas. Turbulence in the expansion zone may cause the flow pattern of the purge gas across a conventional diffuser plate to be altered. Specifically, the fraction of the total flow passing through the openings in the diffuser plate located near the turbulent zone decreases significantly. The decrease in gas flow through openings near the turbulent zone when compared to the gas flow through openings located away from the turbulent zone may create an uneven distribution of precursor during a doping pulse, which ultimately forms a non-uniform film on a substrate. Additionally, recirculation of gas in the expansion zone caused by the turbulence leads to inefficient purging of the precursors from the expansion zone, which may cause gas phase reactions that form a powder in the expansion zone.
- In accordance with the present invention, the disadvantages and problems associated with fabricating conformal thin films on a substrate have been substantially reduced or eliminated. In a particular embodiment, an apparatus for fabricating conformal thin films on a substrate is disclosed that include a diffuser plate having a protrusion that reduces turbulence in an expansion volume associated with a gas injector.
- In accordance with one embodiment of the present invention, a method for fabricating conformal thin films on a substrate includes introducing a gas from a gas inlet into an expansion volume associated with an atomic layer deposition (ALD) system. The gas is flowed through a diffuser plate adjacent to the expansion volume and a reaction chamber. The diffuser plate includes a protrusion located opposite the gas inlet, which reduces turbulence in the expansion volume.
- In accordance with another embodiment of the present invention, an apparatus for fabricating conformal thin films on a substrate includes a reaction chamber and a gas injector located adjacent to the reaction chamber. The gas injector includes an expansion volume and a gas inlet for introducing a gas into the expansion volume. A diffuser plate is located adjacent to the expansion volume and the reaction chamber. A protrusion that reduces turbulence in the expansion volume is located adjacent to the diffuser plate and opposite the gas inlet.
- In accordance with a further embodiment of the present invention, an apparatus for fabricating conformal thin films on a substrate includes a reaction chamber and a gas injector located adjacent to the reaction chamber. The gas injector includes an expansion volume and a gas inlet for introducing an inert gas into the expansion volume. A diffuser plate located adjacent to the expansion volume and the reaction chamber includes a bevel that is located opposite the gas inlet, and reduces turbulence and gas phase reactions in the expansion volume.
- Important technical advantages of certain embodiments of the present invention include a diffuser plate that suppresses turbulence in a gas injector over a wide range of flow rates. The diffuser plate includes a protrusion located opposite a gas inlet of a gas injector. The protrusion prevents gas flowing from the gas inlet from bouncing off the surface of the diffuser plate and recirculating in an area around the gas inlet. The protrusion, therefore, facilitates laminar gas flow in an expansion volume of a gas injector associated with an ALD system.
- Another important technical advantage of certain embodiments of the present invention includes a diffuser plate that increases throughput of an ALD system. The diffuser plate includes a protrusion that facilitates laminar gas flow throughout an expansion volume of a gas injector. The laminar gas flow allows the gas during a purge pulse of an ALD process to remove residual precursor from the expansion volume. By more effectively removing the precursor, gas phase reactions during a subsequent purge pulse may be reduced or even eliminated, thus decreasing the frequency of cleaning processes.
- A further important technical advantage of certain embodiments of the present invention includes a diffuser plate that uniformly distributes a precursor in a reaction chamber. During a doping pulse, a precursor combined with a gas may be flowed through the diffuser plate. A protrusion on the diffuser plate facilitates a laminar gas flow within an expansion volume. Because gas/precursor mixture flows in a laminar manner within the expansion volume, the gas/precursor mixture flows more uniformly through openings in the diffuser plate. The uniform flow of the mixture provides for an improved distribution of precursor over a substrate in the reaction chamber and ultimately allows a substantially uniform film to be formed on the substrate.
- All, some, or none of these technical advantages may be present in various embodiments of the present invention. Other technical advantages will be readily apparent to one skilled in the art from the following figures, descriptions, and claims.
- A more complete and thorough understanding of the present embodiments and advantages thereof may be acquired by referring to the following description taken in conjunction with the accompanying drawings, in which like reference numbers indicate like features, and wherein:
-
FIG. 1 illustrates an atomic layer deposition (ALD) system for forming a conformal thin film on a substrate according to teachings of the present invention; -
FIGS. 2A and 2B illustrate flow patterns in a gas injector at different flow rates using a conventional diffuser plate; -
FIGS. 3A and 3B illustrate flow patterns over a substrate at different flow rates using a conventional diffuser plate; -
FIG. 4 illustrates an example embodiment of a gas injector associated with an ALD system according to teachings of the present invention; -
FIG. 5 illustrates another example embodiment of a gas injector associated with an ALD system according to teachings of the present invention; -
FIGS. 6 a and 6 b respectively illustrate a top view and a bottom view of an example embodiment of a diffuser plate including protrusions formed on a top surface according to teachings of the present invention; and -
FIG. 7 illustrates a gas injector flow pattern using a beveled diffuser plate according to teachings of the present invention. - Preferred embodiments of the present invention and their advantages are best understood by reference to
FIGS. 1 through 7 , where like numbers are used to indicate like and corresponding parts. - The conceptual groundwork for the present invention involves an atomic layer deposition (ALD) process to create highly conformal thin films. In an ALD process, individual precursors are pulsed onto the surface of a substrate contained in a reaction chamber, without mixing the precursors in the gas phase. Each precursor reacts with the surface of the substrate to form an atomic layer in such a way that only one layer forms at a time. The introduction of the precursor into the reaction chamber may be known as a doping pulse. In between doping pulses, the reaction chamber may be purged by flowing a gas over the substrate. The time needed to complete the doping and purge pulses may depend on the flow rate of the precursor or the purge gas. In conventional ALD systems, the precursor or purge gas flows from a gas injector, through a diffuser and into the reaction chamber. The diffuser may include a flat surface having multiple openings to allow the precursor or purge gas to flow into the reaction chamber. If the flow rate of the purge gas during the purge pulse is above a specific level, turbulence may occur near the gas inlet in the injector. The present invention provides a protrusion associated with the diffuser that reduces and even eliminates turbulence in the gas injector. The protrusion may be located opposite the gas inlet such that the purge gas flows over the protrusion and through the openings in the diffuser in a more uniform manner.
-
FIG. 1 illustrates atomic layer deposition (ALD)system 10 for forming a conformal thin film on a substrate. In the illustrated embodiment,ALD system 10 includesdiffuser plate 12, gas lines 14 a and 14 b (generally referred to as gas lines 14),gas injector 16,reaction chamber 18 andoutlet 20. During a purge pulse, a gas may flow through one or both of gas lines 14 a and 14 b from gas reservoirs. The gas then flows throughdiffuser plate 12 included ingas injector 16. A protrusion may be located opposite the gas inlet. The protrusion functions to direct the gas withingas injector 16 such that the gas flows in a laminar manner over a wide range of flow rates. -
ALD system 10 may include one or more gas reservoirs (not expressly shown) connected togas injector 16 bygas lines 14. In one embodiment, the reservoirs may contain an inert gas that is used to remove precursor fromgas injector 16 during a purge pulse and/or that is combined with a precursor during a doping pulse. In another embodiment, the reservoirs may contain a precursor used during a doping pulse.Gas lines 14 may feed the gas intogas injector 16. In one embodiment,gas lines 14 may be formed of stainless steel and have a diameter of approximate one-quarter (¼) inch. Although the illustrated embodiment shows a particular number of reservoirs and associated gas lines,ALD system 10 may include a single reservoir and gas line or more than two reservoirs and their corresponding gas lines. -
Reaction chamber 18 may containsubstrate holder 19. In one embodiment, a substrate placed insubstrate holder 19 may be a p-type or n-type silicon substrate. In other embodiments, the substrate may be formed from gallium arsenide or any other suitable material that may be used as a substrate on which one or more layers of material may be deposited. The one or more layers deposited byALD system 10 may form films used to fabricate conformal barriers, high-k dielectrics, gate dielectrics, tunnel dielectrics and barrier layers for semiconductor devices. ALD films are also thermally stable and substantially uniform, which makes them attractive for optical applications. Another potential application for ALD is the deposition of AlOx as a gap layer for thin film heads, such as heads for recording densities of 50 Gb/in2 and beyond that require very thin and conformal gap layers. Additionally, ALD thin films may be used to form structures with high aspect ratios, such as MicroElectroMechanical (MEM) structures. - The thin film may be formed on a substrate by alternately flowing one or more precursors combined with an inert gas (e.g., a doping pulse) and the inert gas (e.g., a purge pulse) through
reaction chamber 18. The precursor may react with the surface of the substrate to form a single layer of film. The doping and purge pulses may be repeated until a thin film having the desired thickness is formed on the substrate. During the pulses, the gas and precursor may be removed fromreaction chamber 18 throughoutlet 20 by a pump (not expressly shown). - During the purge pulse, the gas from the reservoirs expands into an area contained in
gas injector 16. In conventional ALD systems, if the flow rate of the gas is high enough (e.g., greater than approximately 500 sccm), turbulence may occur due to the flat surface of a diffuser plate located opposite the gas inlet ofgas injector 16. The turbulence prevents the gas in a purge pulse from completely clearing the precursor fromgas injector 16 because the precursor may be trapped in the turbulence, which may lead to gas phase reactions during subsequent pulses that form a powder ingas injector 16. As described below in reference toFIG. 2B , the turbulence may decrease the total flow of gas passing through openings in the diffuser plate located near the turbulent zone. - In the present invention, the expansion volume located in
gas injector 16 may include a protrusion located opposite the gas inlet. In one embodiment, the protrusion may be integral todiffuser plate 12 located betweengas injector 16 andreaction chamber 18. In another embodiment, the protrusion may be separate fromdiffuser plate 12 and mounted to one of the walls associated withgas injector 16. - In one embodiment, the protrusion may be beveled and the surfaces forming the bevel may have similar or different slopes. In other embodiments, the protrusion may include several sloped segments having different slopes or a surface with a smoothly varying slope. The protrusion functions to reduce and even eliminate turbulence at typical gas flow rates (e.g., approximately 2500 sccm and greater) for an ALD process by directing the flow of the gas through
gas injector 16 such that the flow is uniform through each of the openings in the diffuser plate. Additionally, the protrusion may prevent gas phase reactions from occurring ingas injector 16 because the purge pulse more effectively removes the precursor fromgas injector 16. -
FIGS. 2A and 2B illustrate flow patterns inside of a gas injector at different flow rates using a conventional diffuser plate. Specifically,FIG. 2A illustrates the flow pattern of a gas insidegas injector 30 at a flow rate of approximately 100 sccm. A gas may be introduced intogas injector 30 throughgas inlet 32. At the low flow rate, the gas flows substantially uniformly overdiffuser plate 34. As shown, no turbulence is present due to the low flow rate and the gas may flow through openings 36 in a uniform manner. - However, as illustrated by
FIG. 2B , at a flow rate of approximately 500 sccm (e.g., a rate approximately five times greater than the rate illustrated inFIG. 2A ), turbulent zones may occur neargas inlet 32. The turbulence causes a drop in pressure, which causes the flow through openings 36 located oppositegas inlet 32 to be lower than openings 36 located away fromgas inlet 32. In some cases, if the pressure in the gas injector near the turbulent zones is lower than the pressure in the reaction chamber, the gas may actually be sucked from the reaction chamber into the gas injector. The different flow through openings 36 may cause an uneven distribution of the precursor during the doping pulse. Additionally, the recirculation in the turbulent zones may lead to inefficient purging of the precursor ingas injector 30, which may cause gas phase reactions that produce powder ingas injector 30. The powder may damage the substrate contained in the reaction chamber and create a need to clean the ALD system more often. -
FIGS. 3A and 3B illustrate flow patterns over a substrate at different flow rates using a conventional diffuser plate. Specifically,FIG. 3A shows the flow pattern of a gas above a substrate (not expressly shown) at a flow rate of approximately 133 sccm as calculated by a commercially available computational flow dynamics software (e.g., software developed and sold by CFDRC corporation of Huntsville, Ala.). As illustrated, the gas flows substantially uniformly fromgas injector 40 over the substrate tooutlet 42.FIG. 3B shows the flow pattern of the gas at a flow rate of approximately 1333 sccm (e.g., a rate approximately ten times greater than the flow rate illustrated inFIG. 3A ). As shown, the gas flow over the substrate is substantially different at the higher flow rate, especially in the region directly opposite the gas inlet (not expressly shown) ingas injector 40. As described above in reference toFIG. 2B , a conventional diffuser plate may induce turbulence in the region ofgas injector 40 near the gas inlet. As shown inFIG. 3B , the turbulence may reduce the amount of gas flowing through the openings in the diffuser plate that are located opposite the gas inlet. The difference in the flow pattern through the openings in the diffuser plate may cause non-uniform distribution of the precursor over the substrate. -
FIG. 4 illustrates an example embodiment of a diffuser plate including a protrusion located opposite a gas inlet in a gas injector associated with an ALD system.Gas line 14 may includefast valving system 51 located neargas inlet 53 ofgas injector 16.Fast valving system 51 may include several subcomponents, such as mass flow controllers and on/off valves to control the flow versus time profiles of the dosing and purge pulses. A gas may flow throughfast valving system 51 intoexpansion volume 52 viagas inlet 53. The flow of gas fromexpansion volume 52 toreaction chamber 18 may be restricted bydiffuser plate 12. In one embodiment,diffuser plate 12 may be a metal plate including at least oneopening 56. The number, size and position ofopenings 56 may be selected to obtain uniform precursor flow inreaction chamber 18 during a doping pulse and uniform gas flow during a purge pulse.Diffuser plate 12 may further be disposable since prolonged use may lead to deposition of the precursor inopenings 56 and subsequent alteration of flow characteristics over time. - In the illustrated embodiment,
diffuser plate 12 includesprotrusion 58 located oppositegas inlet 53.Protrusion 58 may direct the gas flowing intoexpansion volume 52 such that the gas flows uniformly through each ofopenings 56 intoreaction chamber 18 throughopenings 56. The height ofprotrusion 58 may scale with the size ofgas inlet 53 and a desired operation range for the flow rate. In general, the size ofgas inlet 53 and the flow rate may depend on the size of the substrate, as larger amounts of precursor may be used for larger substrates. In one embodiment, the substrate may have a diameter of approximately 150 millimeters andprotrusion 58 may have a height between approximately three millimeters (3 mm) and approximately eight millimeters (8 mm). -
Protrusion 58 may includesurfaces surfaces protrusion 58 may be formed in the shape of an inverted “U” such that the surface ofprotrusion 58 has a smoothly varying slope. In yet another embodiment,protrusion 58 may include more than two sloped segments where the sloped segments have the same or different slopes and lengths. -
Surface 57 may form a first angle (Φ1) with respect to the surface ofdiffuser plate 12 andsurface 59 may form a second angle (Φ2) with respect to the surface ofdiffuser plate 12. In one embodiment, the first and second angles (Φ1 and Φ2) may be between approximately thirty degrees (30°) and approximately sixty degrees (60°). The first and second angles (Φ1 and Φ2) may be approximately equal or one of the angles may be greater or less than the other angle. -
Protrusion 58 functions to direct the gas flow towardopenings 56 indiffuser plate 12 such that the amount of gas flowing through each ofopenings 56 is approximately equal.Protrusion 58 may further function to eliminate turbulence inexpansion volume 52 by preventing the gas from bouncing off of the surface ofdiffuser plate 12 towardsgas inlet 53, which further prevents recirculation from occurring neargas inlet 53. By eliminating recirculation of the gas inexpansion volume 52, the precursor may be more efficiently purged fromexpansion volume 52 during the purge pulse, which reduces the possibility of gas phase reactions that may form a powder inexpansion volume 52 after prolonged use ofALD system 10. - In another embodiment,
protrusion 58 may be separate fromdiffuser plate 12.Protrusion 58 may be mounted inexpansion volume 52 such thatprotrusion 58 is located oppositegas inlet 53. For example,protrusion 58 may be located on a post mounted to one of the walls ofexpansion volume 52. The post may have a width or diameter less than or equal to the base ofprotrusion 58. Additionally, the post may have a shape similar to that ofprotrusion 58 in order to further aid the flow of gas inexpansion volume 52. - In a further embodiment, a wall protrusion, similar to
protrusion 58 located ondiffuser plate 12, may be formed on at least one of the walls formingexpansion volume 52. The wall protrusion may be formed on at least one of the walls in order to provide a more uniform gas flow throughexpansion volume 52 and to further reduce turbulence at higher flow rates. The wall protrusion may have one or more surfaces. In one embodiment, the surfaces may have approximately the same lengths and/or slopes. In other embodiments, the surfaces of the wall protrusion may have different lengths and/or slopes. In further embodiments, the surface of the wall protrusions may form an inverted “U”. -
FIG. 5 illustrates another example embodiment of a diffuser plate including a protrusion located opposite a gas inlet in a gas injector associated with an ALD system. In the illustrated embodiment,gas inlet 53 may be located at the top ofexpansion volume 52, rather than the center as illustrated inFIG. 4 .Diffuser plate 12 may includeprotrusion 60 that functions to direct the gas flow toward the bottom ofexpansion volume 52. In another embodiment,protrusion 60 may be separate fromdiffuser plate 12 and formed on the wall ofexpansion volume 52.Protrusion 60 may form an angle (Φ) with respect to the surface ofdiffuser plate 12 of approximately thirty degrees (30°) to approximately sixty degrees (60°).Protrusion 60 may allow the gas flow to be evenly distributed throughopenings 56 such that a precursor is evenly distributed inreaction chamber 18. - Although
protrusion 60 is illustrated as having a single surface adjacent to a wall ofexpansion volume 52,protrusion 60 may also have multiple surfaces. For example,gas inlet 53 may be located in a slightly asymmetrical position relative to the walls ofexpansion volume 52.Protrusion 60 may include at least two surfaces, where the surface extending toward the larger portion ofexpansion volume 52 may have a greater length than the surface extending toward the smaller area ofexpansion volume 52. -
FIGS. 6 a and 6 b respectively illustrate a top view and a bottom view of an example embodiment ofdiffuser plate 12 including protrusions 58 a and 58 b. As illustrated inFIG. 1 ,ALD system 10 may include gas lines 14 a and 14 b. Each of gas lines 14 a and 14 b may include a corresponding gas inlet and whendiffuser plate 12 is used inALD system 10, protrusions 58 a and 58 b may be respectively located opposite the gas inlets for gas lines 14 a and 14 b. In this example, protrusions 58 a and 58 b may respectively prevent turbulence from forming near the gas inlets associated with gas lines 14 a and 14 b. In other embodiments,diffuser plate 12 may include any suitable number ofprotrusions 58 such that at least one protrusion is located opposite each of the gas inlets associated with the expansion volume of a gas injector. - As shown in
FIG. 6 a,diffuser plate 12 includes two rows ofopenings 56 formed on a front surface. As described above in reference to protrusions 58 a and 58 b, the two rows ofopenings 56 may correspond to the number of gas inlets associated with the expansion volume. In other embodiments,diffuser plate 12 may include one row or greater than two rows ofopenings 56 where the number of rows depends on the number of gas inlets associated with the expansion volume of the gas injector. - As shown in
FIG. 6 b,diffuser plate 12 may includechamber openings 54 formed on a back surface.Chamber openings 54 may be located adjacent toreaction chamber 18 whendiffuser plate 12 is included inALD system 10 illustrated inFIG. 1 . In order to ensure that the precursor and gas entersreaction chamber 18 through each one ofopenings 56 at the same location,openings 56 may be interleaved indiffuser plate 12 to form a single row ofchamber openings 54. In the illustrated embodiment,openings 56 may be formed indiffuser plate 12 at a forty-five degree angle with respect to the normal of the surface ofdiffuser plate 12. In other embodiments,openings 56 may be formed indiffuser plate 12 at a suitable angle such that each ofopenings 56 forms a singlecorresponding chamber opening 54. In a further embodiment, the number of rows ofchamber openings 54 formed on a back surface ofdiffuser plate 12 may be equal to the number of rows ofopenings 56 formed on a front surface ofdiffuser plate 12. -
FIG. 7 illustrates a gas injector flow pattern using a beveled diffuser plate. In the illustrated embodiment, the flow rate is approximately 8000 sccm. As shown,protrusion 58 may facilitate a laminar gas flow at a flow rate approximately sixteen (16) times greater than the flow rate at which the conventional diffuser plate illustrated inFIG. 2B shows significant turbulence. The gas, therefore, may be evenly distributed through each ofopenings 56 and the precursor distribution inreaction chamber 18 may be improved. - Although the present invention has been described with respect to a specific preferred embodiment thereof, various changes and modifications may be suggested to one skilled in the art and it is intended that the present invention encompass such changes and modifications fall within the scope of the appended claims.
Claims (20)
1. An atomic layer deposition (ALD) apparatus for fabricating a conformal thin film on a substrate, comprising:
a top shield including a top surface and a bottom surface;
a bottom shield including an aperture formed therein and a thickness, the bottom shield coupled to the bottom surface of the top shield such that the top shield covers the aperture;
a substrate holder operable to hold a substrate, the substrate holder in contact with the bottom shield such that a reaction chamber is formed having a volume defined by the aperture and the thickness of the bottom shield; and
a diffuser plate including a protrusion operable to facilitate an increased flow rate of a gas supplied by at least one inlet to the reaction chamber, the diffuser plate removably coupled to the top surface of the top shield.
2. The apparatus of claim 1 , wherein the volume of the reaction chamber is slightly greater than a substrate volume.
3. The apparatus of claim 1 , further comprising the diffuser plate including at least one opening operable to receive the gas from the at least one inlet for introduction into the reaction chamber.
4. The apparatus of claim 3 , further comprising the protrusion operable to facilitate uniform gas flow through the at least one opening in the diffuser plate.
5. The apparatus of claim 1 , further comprising a vertical shield removably coupled to a top shield side surface and a bottom shield side surface, the vertical shield including an outlet formed therein operable to be coupled to a pump such that the pump removes the gas introduced into the reaction chamber and provides uniform gas flow over the substrate.
6. The apparatus of claim 1 , further comprising the top shield removably coupled to the bottom shield.
7. An atomic layer deposition (ALD) apparatus for fabricating a conformal thin film on a substrate, comprising:
a top shield including a top surface and a bottom surface;
a bottom shield including an aperture formed therein and a thickness, the bottom shield removably coupled to the bottom surface of the top shield such that the top shield covers the aperture;
a substrate holder operable to hold a substrate, the substrate holder in contact with the bottom shield such that a reaction chamber is formed having a volume defined by the aperture and the thickness of the bottom shield;
a diffuser plate including a bevel operable to facilitate an increased flow rate of a gas supplied by at least one inlet to the reaction chamber, the diffuser plate removably coupled to the top surface of the top shield; and
a vertical shield including an outlet formed therein operable to be coupled to a pump for removing the gas introduced into the reaction chamber, the vertical shield removably coupled to a top shield side surface and a bottom shield side surface.
8. The apparatus of claim 7 , wherein the volume of the reaction chamber is slightly greater than a substrate volume.
9. The apparatus of claim 7 , further comprising the diffuser plate including at least one opening operable to receive the gas from the at least one inlet for introduction into the reaction chamber.
10. The apparatus of claim 9 , further comprising the bevel operable to facilitate uniform gas flow through the at least one opening in the diffuser plate.
11. The apparatus of claim 7 , wherein the aperture comprises a rectangular shape.
12. An atomic layer deposition (ALD) apparatus for fabricating a conformal thin film on a substrate, comprising:
a top shield including a top surface and a bottom surface;
a bottom shield including an aperture formed therein and a thickness, the bottom shield coupled to the bottom surface of the top shield such that the top shield covers the aperture; and
a substrate holder operable to hold a substrate, the substrate holder in contact with the bottom shield such that a reaction chamber is formed having a volume defined by the aperture and the thickness of the bottom shield.
13. The apparatus of claim 12 , wherein the volume of the reaction chamber is slightly greater than a substrate volume.
14. The apparatus of claim 12 , further comprising:
a diffuser plate including at least one opening operable to receive a gas from at least one inlet for introduction into the reaction chamber, the diffuser plate coupled to the top surface of the top shield; and
a vertical shield including an outlet formed therein operable to be coupled to a pump for removing the gas introduced into the reaction chamber, the vertical shield coupled to a side surface of the top shield and a side surface of the bottom shield.
15. The apparatus of claim 14 , further comprising the diffuser plate removably coupled to the top surface of the top shield such that the diffuser plate may be disposed.
16. The apparatus of claim 14 , further comprising the diffuser plate including a protrusion located opposite the inlet, the protrusion operable to facilitate an increased gas flow rate to the reaction chamber.
17. The apparatus of claim 16 , further comprising the protrusion operable to facilitate uniform gas flow through the at least one opening in the diffuser plate.
18. The apparatus of claim 14 , further comprising the gas selected from the group consisting of a precursor, a reactant gas and an inert gas.
19. The apparatus of claim 12 , wherein the aperture comprises a rectangular shape.
20. The apparatus of claim 12 , further comprising the top shield removably coupled to the bottom shield.
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US20060272577A1 (en) * | 2005-06-03 | 2006-12-07 | Ming Mao | Method and apparatus for decreasing deposition time of a thin film |
WO2006132920A1 (en) * | 2005-06-03 | 2006-12-14 | Veeco Instruments, Inc. | Method and apparatus for decreasing deposition time of a thin film |
US20200185198A1 (en) * | 2016-05-12 | 2020-06-11 | Stephan Wege | Gas injector for reaction regions |
US10971340B2 (en) * | 2016-05-12 | 2021-04-06 | Stephan Wege | Gas injector for reaction regions |
Also Published As
Publication number | Publication date |
---|---|
EP1687460B1 (en) | 2007-12-26 |
DE602004010930D1 (en) | 2008-02-07 |
WO2005049885A2 (en) | 2005-06-02 |
US7071118B2 (en) | 2006-07-04 |
WO2005049885A3 (en) | 2005-07-07 |
ATE382106T1 (en) | 2008-01-15 |
EP1687460A2 (en) | 2006-08-09 |
DE602004010930T2 (en) | 2009-01-02 |
US20050100669A1 (en) | 2005-05-12 |
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