US20070195299A1 - Method for improving an Optical Imaging Property of a Projection Objective of a Microlithographic Projection Exposure Apparatus - Google Patents
Method for improving an Optical Imaging Property of a Projection Objective of a Microlithographic Projection Exposure Apparatus Download PDFInfo
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- US20070195299A1 US20070195299A1 US11/739,192 US73919207A US2007195299A1 US 20070195299 A1 US20070195299 A1 US 20070195299A1 US 73919207 A US73919207 A US 73919207A US 2007195299 A1 US2007195299 A1 US 2007195299A1
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- projection objective
- immersion liquid
- projection
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- exposure apparatus
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70216—Mask projection systems
- G03F7/70341—Details of immersion lithography aspects, e.g. exposure media or control of immersion liquid supply
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70216—Mask projection systems
- G03F7/70258—Projection system adjustments, e.g. adjustments during exposure or alignment during assembly of projection system
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
- G03F7/70591—Testing optical components
- G03F7/706—Aberration measurement
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/70858—Environment aspects, e.g. pressure of beam-path gas, temperature
- G03F7/70883—Environment aspects, e.g. pressure of beam-path gas, temperature of optical system
- G03F7/70891—Temperature
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- Life Sciences & Earth Sciences (AREA)
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
Abstract
A method is disclosed for improving an optical imaging property, for example spherical aberration or the focal length, of a projection objective of a microlithographic projection exposure apparatus. First, an immersion liquid is introduced into an interspace between a photosensitive surface and an end face of the projection objective. Then an imaging property of the projection objective is determined, for example using an interferometer or a CCD sensor arranged in an image plane of the projection objective. This imaging property is compared with a target imaging property. Finally, the temperature of the immersion liquid is changed until the determined imaging property is as close as possible to the target imaging property.
Description
- This application is a continuation of U.S. patent application Ser. No. 11/149,568, filed on Jun. 10, 2005, which is a continuation of International Application PCT/EP2003/001564, filed Feb. 17, 2003, which claims priority of German patent application DE 102 57 766.8, filed Dec. 10, 2002. The full disclosure of these earlier applications are incorporated herein by reference.
- 1. Field of the Invention
- The invention generally relates to microlithographic projection exposure apparatuses as are used in the manufacture of integrated circuits and other microstructured devices. More particularly, the invention relates to a method for improving an optical imaging property, for example spherical aberration or the focal length, of a projection objective of such an apparatus. The invention further relates to a microlithographic projection exposure apparatus as such.
- 2. Description of Related Art
- It is known to change the spatial position of individual optical components, for example by using manipulators, in a projection objective of a microlithographic projection exposure apparatus in order to improve the imaging properties of the objective. The positional change of the relevant optical components is in this case carried out on the projection objective once it has finally been installed, and in general before it has yet been put into operation for the first time. This type of fine adjustment may nevertheless be carried out at a later time, for example in order to compensate for deteriorations of the imaging properties due to ageing. A procedure often adopted in these methods is to record one or more imaging properties of the projection objective by using a sensor arranged in its image plane. The way in which positional changes of individual optical components affect the imaging properties is then observed. The optical imaging properties of the projection objective can thus be optimised by adjusting the optical components.
- From EP 0 023 231 B1 a microlithographic projection exposure apparatus is known that has, in order to hold a support for a semiconductor wafer to be exposed, an open-topped container whose upper edge is higher than the lower delimiting surface of the projection objective. The container is provided with feed and discharge lines for an immersion liquid, which is circulated in a liquid circuit. When the projection exposure apparatus is in operation, the immersion liquid fills the interspace which is left between the semiconductor wafer to be exposed and a boundary surface of the projection exposure objective, which faces it. The resolving power of the projection objective is increased because the refractive index of the immersion liquid is higher than that of air.
- The known projection exposure apparatus furthermore has a device for regulating the temperature of the immersion liquid, which is arranged in the liquid circuit. The temperature of the semiconductor wafer to be exposed can thereby be kept constant, so as to avoid imaging errors due to thermally induced movements of the semiconductor wafer.
- The use of immersion liquids in microlithographic projection exposure apparatus is also known from JP 10-303 114 A. This addresses the problem that undesirable temperature fluctuations of the immersion liquid can also cause a deterioration of the imaging properties of the projection objective. The reason for this involves the dependency of the refractive index of the immersion liquid on the temperature. In order to resolve this problem, various measures are proposed by which the temperature of the immersion liquid can be kept constant within narrow limits during operation of the projection exposure apparatus.
- It is an object of the present invention to provide a method and a microlithographic projection exposure apparatus of the type, in which the optical imaging properties of a projection objective can be improved even more easily and effectively once it has finally been installed.
- This object is achieved, with a projection objective which is part of a microlithographic projection exposure apparatus for projecting a reticle, arranged in an object plane of the projection objective, onto a photosensitive surface that is arranged in an image plane of the projection objective, by a method comprising the following steps:
- a) introducing an immersion liquid into an interspace between the photosensitive surface and an end face of the projection objective, which faces the photosensitive surface;
- b) determining an imaging property of the projection objective;
- c) comparing the imaging property determined in step b) with a target imaging property;
- d) changing the temperature of the immersion liquid until the imaging property as determined in step b) is as close as possible to the target imaging property.
- In order to improve the optical imaging properties of the projection objective, use is made of the discovery that the immersion liquid constitutes an optical component of the projection exposure apparatus, which in principle influences its optical properties just as much as, for instance, the lenses arranged in the projection objective. Instead of now adjusting (exclusively) the lenses or other optical components inside the projection objective mechanically in the optical path of the projection objective, the invention exploits the possibility of influencing the refractive index of the “immersion liquid” optical component via its temperature.
- Although in principle it is also possible to change the refractive index of the optical components contained in the projection objective via the temperature, a temperature change is very much more difficult to achieve there since the materials used for lenses and the like have a low thermal conductivity, which makes it considerably harder to set a homogeneous temperature distribution throughout the optically active volume. Conversely, the temperature of the immersion liquid can quite easily be brought to a predeterminable value and kept constant over the corresponding optically active region, for example by circulating the liquid.
- Since the refractive index of many liquids suitable as an immersion liquid depends only very weakly and—within small temperature intervals—approximately linearly on the temperature, the refractive index of the immersion liquid can be set very precisely via the temperature. With a projection exposure apparatus designed for a wavelength of 193 nm, for example, in which the interspace between the photosensitive surface and the end face of the projection objective is filled with a 1 mm thick layer of water, the refractive index n=1.45 can be varied by one hundredth of a part per thousand by raising or lowering the temperature by 50 mK.
- In order to determine the imaging property, it is in theory possible to position an additional optical system in the image plane of the projection objective, so that an image generated by the projection objective can be observed directly on a screen or through an eyepiece. More simply, the imaging property may be determined by projecting a test reticle through the projection objective and the immersion liquid onto a photosensitive element arranged in the image plane. The imaging properties can then be determined reproducibly and quantifiably by using instruments, which are known per se, to analyse the image stored on the photosensitive element. For example, a photoemulsion may be envisaged as the photosensitive element.
- It is nevertheless particularly advantageous for the photosensitive element to be a sensor device, in particular a CCD sensor. In this way, the image generated in the image plane can be directly recorded and evaluated, i.e. without developing a photoemulsion or the like, in order to determine the imaging properties.
- As an alternative to this, the imaging property may also be determined by using an interferometer as known, for example, from WO 01/632 33 A1.
- By using the method according to the invention, it is possible to improve all optical imaging properties of the projection objective which can be influenced by the immersion liquid. For example, the optical imaging property to be improved may be a spherical aberration caused by the projection objective. Such spherical aberrations occur particularly in projection objectives with a high numerical aperture.
- The optical imaging property to be improved may also, for example, be the focal length of the projection objective. Since very accurate arrangement of the reticle in the focal plane of the projection objective is necessary so that a high-resolution image of the structures to be projected—which are contained in this reticle—can be formed on the photosensitive surface, conventional types of projection exposure apparatus often have an adjustment feature with which the support of the photosensitive surface can be moved along the optical axis of the projection objective. In this way, it is possible to position the photosensitive surface in the focal plane of the projection objective. These mechanical adjustment devices, however, have quite elaborate designs. By changing the temperature of the immersion liquid, it is very easy to influence the focal length of the projection objective so that an adjustment feature for the support of the photosensitive surface may be obviated.
- If a projection exposure apparatus comprises a sensor device—in particular a CCD sensor—which can be arranged in the image plane of the projection objective, a temperature control device for setting a target temperature of the immersion liquid, and a computer unit which is connected to the temperature control device, the latter may be used to determine the target temperature of the immersion liquid from signals generated by the sensor device.
- Such a projection exposure apparatus allows automated improvement of the optical imaging properties of the projection objective by changing the temperature of the immersion liquid. The computer unit may, for example, be designed so that it determines the imaging properties of the projection objective from the signals generated by the sensor device, and compares them with a target imaging property. In a control process, the computer unit then causes the temperature management device to change the temperature of the immersion liquid until the imaging property as recorded by the sensor device is as close as possible to the target imaging property. Such a projection exposure apparatus allows an operator to compensate automatically for certain deteriorations of the imaging properties of the projection objective, i.e. without drawing in specialists, by changing the refractive index of the immersion liquid. Possible causes of the deteriorations may, for example, be ageing-induced material modifications or fluctuations in the air pressure.
- Various features and advantages of the present invention may be more readily understood with reference to the following detailed description taken in conjunction with the accompanying drawing in which:
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FIG. 1 is a simplified representation of a microlithographic projection exposure apparatus in a longitudinal section; -
FIG. 2 shows an enlarged detail ofFIG. 1 , in which ray paths in the region of an immersion liquid are indicated; -
FIG. 3 shows the detail according toFIG. 2 , but after raising the temperature of the immersion liquid; -
FIG. 4 shows an enlarged detail, corresponding toFIG. 2 , of a projection exposure apparatus having different imaging optics; -
FIG. 5 shows the detail according toFIG. 4 , but after raising the temperature of the immersion liquid; -
FIG. 6 shows a simplified representation of another microlithographic projection exposure apparatus, having a sensor device arranged in the image plane, in a longitudinal section. -
FIG. 1 shows a microlithographic projection exposure apparatus, denoted in its entirety by 10, in a longitudinal section. Theprojection exposure apparatus 10 comprises anillumination system 12 for generating aprojection light beam 13, which includes aprojection light source 14, illumination optics indicated by 16 and adiaphragm 18. - The
projection exposure apparatus 10 furthermore comprises aprojection objective 20 which projects a reduced image of amask 24, arranged in itsobject plane 22, onto aphotosensitive surface 26 arranged in animage plane 28 of theprojection objective 20. Theprojection objective 20 contains a multiplicity of optical components, only some of which (not dealt with in detail) are represented by way of example inFIG. 1 . - The
photosensitive surface 26 may, for example, be a photoresist which is applied on asupport 30, for example a silicon wafer. The support is fastened on the bottom of an open-toppedcontainer 32 with the shape of a trough, which can be displaced parallel to the image plane by a first displacement device denoted by 36. Thecontainer 32 is filled sufficiently high with animmersion liquid 38 so that aninterspace 40 between thephotosensitive surface 26 and anend face 42 of theprojection objective 20 is filled completely with theimmersion liquid 38. - The
container 32 also contains atemperature regulating device 44, which may include a heating device or alternatively a combined heating/cooling device. Atemperature sensor 46, which records the temperature of theimmersion liquid 38 very accurately, is fastened on the inside of thecontainer 32. - The
temperature regulating device 44 and thetemperature sensor 46 are connected, via lines which do not impede the displacement of thecontainer 32, to atemperature controller 48 which has aslide switch 50 for adjusting a setpoint temperature. - The
reticle 24, whose structures are intended to be projected onto thephotosensitive surface 26, can be displaced in theobject plane 22 by using asecond displacement device 52, so that images of the entire structured region of thereticle 24 can progressively be formed on thephotosensitive surface 26. - The
projection exposure apparatus 10 functions in the following way: - The
projection light beam 13 generated by theillumination device 12 passes through the structures of thereticle 24 and enters theprojection objective 20. On thephotosensitive surface 26, the latter forms a reduced image of the structures through which theprojection light beam 13 has passed. In order to project the entire area of thereticle 24 onto thephotosensitive surface 26, thereticle 24 may be illuminated in a “step and scan” process. In this case, the entire region of thereticle 24 is illuminated by scanning while thesecond displacement device 52 moves thereticle 24 through the projection light beam delimited by thediaphragm 18. During this scanning movement, thecontainer 32 with thesupport 30 fastened in it is subjected to a movement (usually in the opposite direction) by using thefirst displacement device 36, the displacement speed of which is reduced relative to that of thereticle 24 by the reduction ratio of theprojection objective 20. - During this displacement of the
container 32, theend face 42 of theprojection objective 20 is moved through theimmersion liquid 38 carried along by thecontainer 32, which leads to mixing of theimmersion liquid 38. Such mixing is desirable since theimmersion liquid 38 may become locally heated by the projection light passing through, so that thetemperature sensor 46 might otherwise possibly not measure the temperature actually prevailing in theinterspace 40. If the mixing due to the displacement of thecontainer 32 is not sufficient, additional mixing devices may of course be arranged in thecontainer 32. It is likewise possible to fit thecontainer 32 in a liquid circuit, as is known per se in the prior art. Thetemperature regulating device 44 and thetemperature sensor 46 may then be integrated in this temperature circuit alongside a filter which may optionally be provided. - If it is found during a test process when adjusting the projection objective, or during subsequent operation by checking the wafers which are produced, that the imaging properties of the
projection objective 20 do not correspond to an intended target imaging property, for example because the imaging on thephotosensitive surface 26 is distorted by spherical aberration, then the setpoint temperature of thetemperature controller 48 is changed by actuating theslide switch 50 and the exposure is repeated. Changing the temperature of theimmersion liquid 38 changes its refractive index. The dependency of the refractive index on the temperature—at least in small temperature intervals—is approximately linear formany immersion liquids 38, so that a temperature at which one or more imaging properties of theprojection objective 20 are improved can be determined very straightforwardly for theimmersion liquid 38 in a recursive process. The further exposure ofphotosensitive surfaces 26 is then carried out at this finally adjusted temperature of theimmersion liquid 38. - The effect of the refractive index of the
immersion liquid 38 on the imaging properties of theprojection objective 20 will be explained in more detail below with reference to FIGS. 2 to 5. -
FIG. 2 shows an enlarged detail ofFIG. 1 , in which a ray path is indicated in the region of theinterspace 40 between theend face 42 of theprojection objective 20 and thephotosensitive surface 26. In this exemplary embodiment, theend face 42 of theprojection objective 20 includes a flush-fittedplanoconvex terminating lens 52 which constitutes the last optical component of the projection optics (merely indicated by 54) of theprojection objective 20. For illustrative purposes,FIG. 2 indicates a plurality of projection light rays 56, 58, 60 which propagate through the preceding optical components of theprojection objective 20 towards the terminatinglens 52. The representation is highly schematised and not true to scale in order to show the effect of the temperature on the imaging properties of theprojection objective 20 more clearly. - The
projection objective 20 shown inFIG. 2 produces an image distorted by spherical aberration. This means that the focal lengths are respectively different for the near-axis projection light rays 56 and for the off-axial projection light beams 58 and 60. InFIG. 2 , only the focal plane of the near-axis projection light rays 56 lies in the plane of thephotosensitive surface 26, whereas the focal planes of the off-axial projection light rays 58 and 60 lie in theinterspace 40. The distance of the focal planes from thephotosensitive surface 26 in this case increases commensurately when the projection light rays 56, 58, 60 pass through the terminatinglens 52 further away from the optical axis denoted by 62. -
FIG. 3 shows the detail inFIG. 2 after the temperature of theimmersion liquid 38 has been raised. The immersion liquid now has a higher refractive index than in the state shown inFIG. 2 . The effect of this is that the projection light rays 56, 58, 60 are refracted more strongly at the interface between the terminatinglens 52 and theimmersion liquid 38. This stronger refraction has a commensurately greater effect the further the projection light rays are away from theoptical axis 62, since the off-axial projection light rays pass through this interface at a larger angle. The result of this is that the focal length of theprojection objective 20 is extended for the off-axial rays so that, in the ideal case with a correspondingly selected temperature, the focal planes of all the projection light rays 56, 58, 60 coincide with the image plane in 28 which thephotosensitive surface 26 is arranged. - By changing the temperature of the
immersion liquid 38, it is thus possible to compensate retrospectively for an inherent spherical aberration in theprojection objective 20. -
FIG. 4 shows an enlarged detail, corresponding toFIG. 2 , of a projection exposure apparatus having adifferent projection objective 120. In this embodiment, parts modified with respect toFIG. 2 are denoted by reference numerals that are increased by 100. - Unlike the
projection optics 54 shown inFIGS. 2 and 3 , theprojection optics 154 of theprojection objective 120 do not have an inherent spherical aberration. The projection light rays 156, 158, 160 therefore meet at a focal point. As can be seen inFIG. 4 , however, this focal point does not lie in theimage plane 28, i.e. theprojection objective 120 has a focusing error. Such a focusing error could, for example, be remedied by slightly displacing thesupport 30 with thephotosensitive surface 26 in the direction of theoptical axis 62 with the use of a suitable displacement device. Unfortunately, the accuracy required for this can be achieved only with great technical outlay when mechanical displacement devices are used. - As shown by
FIG. 5 , it is likewise possible to extend the focal length of theprojection objective 120 deliberately by raising the temperature of theimmersion liquid 38. Admittedly, this does introduce a spherical aberration (not represented inFIG. 5 ). Nevertheless, the effects of such a spherical aberration may be so small that they are negligible in view of the optimisation of the focal length of the projection objective, or they can be compensated for by other measures. -
FIG. 6 shows details of another exemplary embodiment with a projection exposure apparatus denoted in its entirety by 210, in a representation similar toFIG. 1 . Here again, parts modified with respect to the embodiment shown inFIG. 1 are provided with reference numerals increased by 200. -
FIG. 6 shows theprojection exposure apparatus 210 in an adjustment mode, in which thesupport 30 is replaced by asensor device 64. Thesensor device 64 may, for example, be a CCD sensor, as it is known per se in the art. In the adjustment mode, thephotosensitive surface 66 of thesensor device 64 is arranged in theimage plane 28 of theprojection objective 20. In this way, thesensor device 64 records exactly the same image as the one to which thephotosensitive surface 26 is exposed during the normal projection mode. The projection is in this case carried out using a special test reticle 70, which is arranged in place of thenormal reticle 24 in theobject plane 22 of theprojection objective 20. - Instead of the CCD sensor, it is also possible to use an interferometer as the sensor device in a manner which is known per se. Wavefronts in pupil planes can thereby be recorded. This is described in more detail in the aforementioned WO 01/63233 A1.
- In contrast to the
projection exposure apparatus 10 inFIG. 1 , theprojection exposure apparatus 210 furthermore has acomputer unit 68 which is connected to atemperature controller 248 for thetemperature regulating device 44. In the adjustment mode, theprojection exposure apparatus 210 functions in the following way: - First, an image of the structures contained on the test reticle 70 is formed on the
photosensitive surface 66 of thesensor device 64 by theprojection objective 20. This image is recorded by thesensor device 64 and transmitted in digital form to thecomputer unit 68. From the data received, the latter determines a setpoint temperature which is sent to thetemperature controller 248. Thetemperature controller 248 then ensures that theimmersion liquid 38 is brought to this new setpoint temperature. Thesensor device 64 records the image of the structures of the test reticle 70 as modified by the temperature change, and likewise feeds these data to thecomputer unit 68. By using algorithms which are known per se, thecomputer unit 68 establishes whether the temperature change has led to an improvement or deterioration in the imaging properties of theprojection objective 120. The setpoint temperature is changed again in accordance with this result. This recursive process is continued until it is no longer possible to improve the imaging properties of the projection objective by changing the temperature.
Claims (8)
1. A method of operating an immersion-type microlitho-graphic projection exposure apparatus, said method comprising the following steps:
a) applying an immersion liquid on a photosensitive surface;
b) heating or cooling the immersion liquid to a first target temperature;
c) forming an image of a reticle through a projection objective on the photosensitive surface; and
d) heating or cooling the immersion liquid to a second target temperature, which differs from the first target temperature.
2. The method of claim 1 , wherein the second target temperature is determined such that the immersion liquid at least partially compensates for a time-variant change of an optical imaging property of the projection objective.
3. The method of claim 2 , wherein the optical imaging property is a spherical aberration present in the projection objective.
4. The method of claim 2 , wherein the optical imaging property is the focal length of the projection objective.
5. A method of operating an immersion-type microlitho-graphic projection exposure apparatus, said method comprising the following steps:
a) applying an immersion liquid on a photosensitive surface; and
b) varying a target temperature of the immersion liquid.
6. A microlithographic projection exposure apparatus, comprising:
a) a projection objective which is configured for projecting a reticle onto a photosensitive surface;
b) a filling device for applying an immersion liquid onto the photosensitive surface;
c) a temperature control device which is configured to selectively set the temperature of the immersion liquid to different target temperatures.
7. A microlithographic projection exposure apparatus, comprising:
a) a projection objective which is configured to project a reticle onto a photosensitive surface; and
b) an immersion liquid which contacts the photosensitive surface and has a time-variant temperature which is, at a given time, set during operation of the apparatus such that the immersion liquid reduces a time-variant aberration of the projection objective.
8. The apparatus of claim 7 , wherein the aberration is a spherical aberration.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US11/739,192 US20070195299A1 (en) | 2002-12-10 | 2007-04-24 | Method for improving an Optical Imaging Property of a Projection Objective of a Microlithographic Projection Exposure Apparatus |
US12/203,738 US8237915B2 (en) | 2002-12-10 | 2008-09-03 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
US13/564,857 US20130114056A1 (en) | 2002-12-10 | 2012-08-02 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10257766A DE10257766A1 (en) | 2002-12-10 | 2002-12-10 | Method for setting a desired optical property of a projection lens and microlithographic projection exposure system |
DEDE10257766.8 | 2002-12-10 | ||
PCT/EP2003/001564 WO2004053596A2 (en) | 2002-12-10 | 2003-02-17 | Method for adjusting a desired optical property of a positioning lens and microlithographic projection exposure system |
US11/149,568 US7227616B2 (en) | 2002-12-10 | 2005-06-10 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
US11/739,192 US20070195299A1 (en) | 2002-12-10 | 2007-04-24 | Method for improving an Optical Imaging Property of a Projection Objective of a Microlithographic Projection Exposure Apparatus |
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US11/149,568 Continuation US7227616B2 (en) | 2002-12-10 | 2005-06-10 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
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US12/203,738 Continuation US8237915B2 (en) | 2002-12-10 | 2008-09-03 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
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US11/149,568 Expired - Fee Related US7227616B2 (en) | 2002-12-10 | 2005-06-10 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
US11/739,192 Abandoned US20070195299A1 (en) | 2002-12-10 | 2007-04-24 | Method for improving an Optical Imaging Property of a Projection Objective of a Microlithographic Projection Exposure Apparatus |
US12/203,738 Expired - Fee Related US8237915B2 (en) | 2002-12-10 | 2008-09-03 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
US13/564,857 Abandoned US20130114056A1 (en) | 2002-12-10 | 2012-08-02 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
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US11/149,568 Expired - Fee Related US7227616B2 (en) | 2002-12-10 | 2005-06-10 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
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US12/203,738 Expired - Fee Related US8237915B2 (en) | 2002-12-10 | 2008-09-03 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
US13/564,857 Abandoned US20130114056A1 (en) | 2002-12-10 | 2012-08-02 | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
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US (4) | US7227616B2 (en) |
EP (1) | EP1570315B1 (en) |
JP (1) | JP2006509357A (en) |
AU (1) | AU2003221481A1 (en) |
DE (2) | DE10257766A1 (en) |
WO (1) | WO2004053596A2 (en) |
Cited By (2)
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US20070258070A1 (en) * | 2004-07-12 | 2007-11-08 | Nikon Corporation | Method for Determining Exposure Condition, Exposure Method, Exposure Apparatus, and Method for Manufacturing Device |
US20090002661A1 (en) * | 2002-12-10 | 2009-01-01 | Carl Zeiss Smt Ag | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
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US20090002661A1 (en) * | 2002-12-10 | 2009-01-01 | Carl Zeiss Smt Ag | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
US8237915B2 (en) | 2002-12-10 | 2012-08-07 | Carl Zeiss Smt Gmbh | Method for improving an optical imaging property of a projection objective of a microlithographic projection exposure apparatus |
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Also Published As
Publication number | Publication date |
---|---|
US20090002661A1 (en) | 2009-01-01 |
WO2004053596A2 (en) | 2004-06-24 |
US20050264780A1 (en) | 2005-12-01 |
DE10257766A1 (en) | 2004-07-15 |
WO2004053596A3 (en) | 2004-12-02 |
DE50308894D1 (en) | 2008-02-07 |
EP1570315A2 (en) | 2005-09-07 |
US20130114056A1 (en) | 2013-05-09 |
EP1570315B1 (en) | 2007-12-26 |
JP2006509357A (en) | 2006-03-16 |
US7227616B2 (en) | 2007-06-05 |
AU2003221481A1 (en) | 2004-06-30 |
US8237915B2 (en) | 2012-08-07 |
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Owner name: CARL ZEISS SMT AG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GRAEUPNER, PAUL;REEL/FRAME:019911/0571 Effective date: 20050624 |
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