US20050020055A1 - Semiconductor processing methods - Google Patents

Semiconductor processing methods Download PDF

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Publication number
US20050020055A1
US20050020055A1 US10/917,820 US91782004A US2005020055A1 US 20050020055 A1 US20050020055 A1 US 20050020055A1 US 91782004 A US91782004 A US 91782004A US 2005020055 A1 US2005020055 A1 US 2005020055A1
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Prior art keywords
layer
photoresist
antireflective material
material layer
substrate
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US10/917,820
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Richard Holscher
Zhiping Yin
Tom Glass
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Individual
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Priority to US10/917,820 priority Critical patent/US20050020055A1/en
Publication of US20050020055A1 publication Critical patent/US20050020055A1/en
Priority to US11/218,045 priority patent/US7626238B2/en
Priority to US11/220,458 priority patent/US20070238207A1/en
Priority to US11/482,244 priority patent/US7804115B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
    • H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
    • H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
    • H01L21/0274—Photolithographic processes
    • H01L21/0276—Photolithographic processes using an anti-reflective coating
    • 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
    • G03F7/004—Photosensitive materials
    • G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
    • G03F7/091—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by antireflection means or light filtering or absorbing means, e.g. anti-halation, contrast enhancement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
    • H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
    • H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
    • H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
    • H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
    • H01L21/3086—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/151—Matting or other surface reflectivity altering material

Definitions

  • the antireflective material layer 14 can comprise an inorganic material, such as, for example, a material comprising from about 5% to about 37% (by atomic concentration) oxygen, about 10% to about 35% (by atomic concentration) nitrogen, from about 50% to about 65% (by atomic concentration) silicon, and hydrogen.
  • a specific example inorganic material comprises about 10% (by atomic concentration) nitrogen, about 25% (by atomic concentration) oxygen and about 65% (by atomic concentration) silicon.
  • Antireflective coating layer 14 can, for example, consist of a single substantially homogeneous layer of the above-described inorganic material.

Abstract

In one aspect, the invention includes a semiconductor processing method. An antireflective material layer is formed over a substrate. At least a portion of the antireflective material layer is annealed at a temperature of greater than about 400° C. A layer of photoresist is formed over the annealed antireflective material layer. The layer of photoresist is patterned. A portion of the antireflective material layer unmasked by the patterned layer of photoresist is removed. In another aspect, the invention includes the following semiconductor processing. An antireflective material layer is formed over a substrate. The antireflective material layer is annealed at a temperature of greater than about 400° C. A layer of photoresist is formed over the annealed antireflective material layer. Portions of the layer of photoresist are exposed to radiation waves. Some of the radiation waves are absorbed by the antireflective material during the exposing.

Description

    TECHNICAL FIELD
  • The invention pertains to semiconductor processing methods, such as, for example, methods of patterning photoresist in which an antireflective material is utilized to attenuate (for example, absorb) radiation.
    • BACKGROUND OF THE INVENTION
  • Semiconductor processing frequently involves providing a photoresist layer over a substrate. Portions of the photoresist layer are subsequently exposed to light through a masked light source. The mask contains clear and opaque features defining a pattern to be created in the photoresist layer. Regions of the photoresist layer which are exposed to light are made either soluble or insoluble in a solvent. If the exposed regions are soluble, a positive image of the mask is produced in the photoresist. The photoresist is therefore termed a positive photoresist. On the other hand, if the non-irradiated regions are dissolved by the solvent, a negative image results. Hence, the photoresist is referred to as a negative photoresist.
  • A difficulty that can occur when exposing photoresist to radiation is that waves of radiation can propagate through the photoresist to a layer beneath the photoresist and then be reflected back up through the photoresist to interact with other waves propagating through the photoresist. The reflected waves can constructively and/or destructively interfere with other waves propagating through the photoresist to create periodic variations of light intensity within the photoresist. Such variations of light intensity can cause the photoresist to receive non-uniform doses of energy throughout its thickness. The non-uniform dose can decrease the accuracy and precision with which a masked pattern is transferred to the photoresist. Also, the radiated waves reflected back from a non-flat surface underlying photoresist can enter portions of the photoresist that are not supposed to be exposed. Accordingly, it is desired to develop methods which suppress radiation waves from being reflected by layers beneath a photoresist layer.
  • A method which has been used with some success to suppress reflected waves is to form an antireflective material beneath a photoresist layer. Antireflective materials can, for example, comprise materials which absorb radiation, and which therefore quench reflection of the radiation.
  • Antireflective materials absorb various wavelengths of radiation with varying effectiveness. The wavelengths absorbed, and the effectiveness with which they are absorbed, vary depending on the materials utilized. The number of materials available for use as antireflective materials is limited. Accordingly, it is desired to develop alternative methods of varying the wavelengths absorbed, and effectiveness with which the wavelengths are absorbed, for antireflective materials.
    • SUMMARY OF THE INVENTION
  • In one aspect, the invention includes a semiconductor processing method wherein an antireflective material layer is formed over a substrate. At least a portion of the antireflective material layer is annealed at a temperature of greater than about 400° C. A layer of photoresist is formed over the annealed antireflective material layer. The layer of photoresist is patterned. A portion of the antireflective material layer unmasked by the patterned layer of photoresist is removed.
  • In another aspect, the invention includes a semiconductor processing method wherein an antireflective material layer is formed over a substrate. The antireflective material layer is annealed at a temperature of greater than about 400° C. A layer of photoresist is formed over the annealed antireflective material layer. Portions of the layer of photoresist are exposed to radiation waves, some of the radiation waves are attenuated by the antireflective material as the portions are exposed.
  • In yet another aspect, the invention includes a semiconductor processing method wherein a solid antireflective material layer is formed over a substrate. Optical properties of the antireflective material layer are altered. After altering the optical properties, a layer of photoresist is formed over the antireflective material layer. Portions of the layer of photoresist are exposed to radiation waves. Some of the radiation waves are absorbed by the antireflective material.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Preferred embodiments of the invention are described below with reference to the following accompanying drawings.
  • FIG. 1 is a fragmentary, diagrammatic, cross-sectional view of a semiconductor wafer fragment at a preliminary processing step of a method of the present invention.
  • FIG. 2 is a view of the FIG. 1 wafer fragment at a processing step subsequent to that shown in FIG. 1.
  • FIG. 3 is a view of the FIG. 1 wafer fragment at a processing step subsequent to that shown in FIG. 2.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • This disclosure of the invention is submitted in furtherance of the constitutional purposes of the U.S. Patent Laws “to promote the progress of science and useful arts” (Article 1, Section 8).
  • A method of the present invention is described with reference to FIGS. 1-3. Referring to FIG. 1, a semiconductor wafer fragment 10 is illustrated at a preliminary processing step. Wafer fragment 10 comprises a substrate 12, an overlying antireflective material layer 14, and a photoresist layer 16 over the antireflective material layer 14. The substrate can comprise, for example, a monocrystalline silicon wafer lightly doped with a conductivity-enhancing dopant. To aid in interpretation of this disclosure and the claims that follow, the term “semiconductive substrate” is defined to mean any construction comprising semiconductive material, including, but not limited to, bulk semiconductive materials such as a semiconductive wafer (either alone or in assemblies comprising other materials thereon), and semiconductive material layers (either alone or in assemblies comprising other materials). The term “substrate” refers to any supporting structure, including, but not limited to, the semiconductive substrates described above.
  • The antireflective material layer 14 can comprise an inorganic material, such as, for example, a material comprising from about 5% to about 37% (by atomic concentration) oxygen, about 10% to about 35% (by atomic concentration) nitrogen, from about 50% to about 65% (by atomic concentration) silicon, and hydrogen. A specific example inorganic material comprises about 10% (by atomic concentration) nitrogen, about 25% (by atomic concentration) oxygen and about 65% (by atomic concentration) silicon. Antireflective coating layer 14 can, for example, consist of a single substantially homogeneous layer of the above-described inorganic material.
  • As another example, antireflective coating layer 14 can comprise a stack of materials, with at least one of the materials in the stack being configured to attenuate radiation that passes through the photoresist. The attenuation can encompass either total or partial absorption of such radiation. If the attenuation encompasses only partial absorption, then preferably the radiation that is not absorbed will be reflected at an appropriate wavelength and phase such that it is cancelled by other radiation passing through the stack. In an exemplary configuration of an antireflective layer comprising a stack of materials, the layer comprises a material comprising from about 5% to about 37% (by atomic concentration) oxygen, about 10% to about 35% (by atomic concentration) nitrogen, from about 50% to about 65% (by atomic concentration) silicon, and hydrogen at the bottom of the stack, The remainder of the stack comprises one or more layers that are fully or partially transmissive of the radiation. Such layers can comprise, for example, silicon dioxide.
  • Photoresist layer 16 can comprise either a negative photoresist or a positive photoresist.
  • In accordance with the present invention, antireflective material layer 14 is applied over substrate 12 and at least a portion of layer 14 is annealed at a temperature greater than about 400° C. (preferably greater than 400° C.) prior to formation of photoresist layer 16. If the antireflective material includes a portion comprising the above-discussed inorganic materials comprising nitrogen, oxygen, hydrogen and silicon, such portion can be applied by chemical vapor deposition at a temperature of from about 250° C. to about 400°. The portion is then preferably annealed at a temperature of from about 800° C. to about 1050° C., more preferably from about 800° C. to about 900° C., and most preferably about 850° C. During the anneal, the antireflective material layer 14 is preferably exposed to a nitrogen-containing atmosphere, such as an atmosphere comprising N2 and Ar. The atmosphere can, for example, consist essentially of N2.
  • An anneal of an antireflective material layer at a temperature of greater than about 400° C. has been found to alter optical properties of the antireflective material layer to make the antireflective material layer more absorptive to radiation. Such anneal is particularly beneficial for a portion of an antireflective material layer comprising oxygen, nitrogen, silicon, and hydrogen. Specifically, the anneal has been found to influence a refractive index coefficient (n) of the antireflective material layer and an extinction coefficient (energy absorption coefficient) (k) of the antireflective material layer. For instance, it has been found that an anneal at greater than about 400° C. of a hydrogenated materia) comprising about 10% (by atomic concentration) nitrogen, about 25% (by atomic concentration) oxygen and about 65% (by atomic concentration) silicon will alter the “n” and “k” of the material exposed to 248 nanometer wavelength light from 2.12 and 1.19, respectively, to 1.89 and 1.41, respectively. Also, the anneal will alter the “n” and “k” of such material when exposed to 365 nanometer wavelength light from 2.67 and 0.59, respectively, to 2.89 and 1.11, respectively.
  • After the anneal of at least a portion of antireflective material layer 14, photoresist layer 16 is formed over antireflective layer 14. Photoresist layer 16 can be formed by conventional methods. An example method includes spinning a photoresist liquid over layer 14 and subsequently volatilizing solids from the layer to form a solid photoresist layer 16.
  • Referring to FIG. 2, photoresist layer 16 is patterned by exposing the layer to a patterned beam of radiation. Such patterning can comprise conventional methods such as the negative photoresist processing or positive photoresist processing described in the “Background” section of this disclosure. Portions of photoresist layer 16 that are exposed to the radiation will behave differently in a solvent than will portions unexposed to radiation. Either the portion exposed to radiation or the portion unexposed to radiation is removed from over substrate 12 to leave the other of the portions exposed to radiation or unexposed to radiation remaining over substrate 12. Whether it is the portion that is exposed to radiation that is removed or the portion that is unexposed to radiation that is removed will depend on whether photoresist layer 16 comprises a negative or positive photoresist. The removal of a portion of photoresist layer 16 forms an opening 18 through photoresist layer 16. After formation of opening 18, photoresist layer 16 becomes a patterned mask. A portion of antireflective material layer 14 is covered by the patterned mask 16, and a portion is exposed through opening 18.
  • During the exposure of photoresist layer 16 to radiation, some of the radiation penetrates through layer 16 and into antireflective material layer 14. Antireflective material layer 14 attenuates, and preferably absorbs such penetrating radiation waves.
  • Referring to FIG. 3, opening 18 is extended through antireflective material layer 14 and into substrate 12. Opening 18 can be extended by conventional methods, such as, for example, a dry plasma etch or a wet etch.
  • In the shown embodiment, photoresist layer 16 is against antireflective material layer 14. It is to be understood that in other embodiments of the invention, which are not shown, intervening layers can be formed between photoresist layer 16 and antireflective material layer 14. If such intervening layers are at least partially transparent to the radiation utilized to pattern photoresist layer 16, the radiation will penetrate to antireflective material layer 14 and be absorbed by material layer 14 during exposure of photoresist layer 16 to the radiation. It is also to be understood that if such intervening layers are present, a pattern of layer 16 could be transferred to the intervening layers without extending the pattern to layer 14. Thus, the invention encompasses embodiments in which antireflective material layer 14 is not etched.
  • In compliance with the statute, the invention has been described in language more or less specific as to structural and methodical features. It is to be understood, however, that the invention is not limited to the specific features shown and described, since the means herein disclosed comprise preferred forms of putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims appropriately interpreted in accordance with the doctrine of equivalents.

Claims (10)

1-26. (Canceled).
27. A semiconductor device comprising:
a substrate; and
an annealed antireflective material layer over the substrate, the antireflective material layer comprising oxygen, nitrogen and silicon, and wherein the annealing is achieved by exposing the antireflective material layer to a temperature of at least 550° C., and wherein the substrate and the antireflective material layer have an opening extending through the antireflective material layer and partially into the substrate.
28. The device of claim 27 wherein the antireflective material layer comprises from about 5% to about 37% (by atomic concentration) oxygen, from about 10% to about 35% (by atomic concentration) nitrogen, from about 50% to about 65% (by atomic concentration) silicon, and hydrogen.
29. A semiconductor device comprising:
a substrate;
an annealed antireflective material comprising three layers over the substrate, and wherein the annealing is achieved by exposing the antireflective material layer to a temperature of at least 550° C.; and
at least one layer of the three layers comprises silicon dioxide.
30. (Canceled).
31. The device of claim 27 wherein the substrate comprises monocrystalline silicon.
32. The device of claim 29 wherein the three layers comprise an elevationally uppermost layer relative the substrate, and wherein the uppermost layer comprises silicon dioxide.
33. The device of claim 29 wherein at least two of the three layers comprise silicon dioxide.
34. The device of claim 29 wherein at least one of the three layers is at least partially transparent to light radiation.
35. The device of claim 29 wherein at least two of the three layers are at least partially transparent to light radiation.
US10/917,820 1998-02-25 2004-08-13 Semiconductor processing methods Abandoned US20050020055A1 (en)

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Application Number Priority Date Filing Date Title
US10/917,820 US20050020055A1 (en) 1998-02-25 2004-08-13 Semiconductor processing methods
US11/218,045 US7626238B2 (en) 1998-02-25 2005-08-31 Semiconductor devices having antireflective material
US11/220,458 US20070238207A1 (en) 1998-02-25 2005-09-06 Semiconductor constructions
US11/482,244 US7804115B2 (en) 1998-02-25 2006-07-07 Semiconductor constructions having antireflective portions

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US09/030,618 US6274292B1 (en) 1998-02-25 1998-02-25 Semiconductor processing methods
US09/885,393 US6878507B2 (en) 1998-02-25 2001-06-19 Semiconductor processing methods
US10/277,437 US20030054294A1 (en) 1998-02-25 2002-10-21 Semiconductor processing methods
US10/917,820 US20050020055A1 (en) 1998-02-25 2004-08-13 Semiconductor processing methods

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US10/277,437 Division US20030054294A1 (en) 1998-02-25 2002-10-21 Semiconductor processing methods

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US11/218,045 Division US7626238B2 (en) 1998-02-25 2005-08-31 Semiconductor devices having antireflective material
US11/220,458 Continuation US20070238207A1 (en) 1998-02-25 2005-09-06 Semiconductor constructions

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US09/030,618 Expired - Lifetime US6274292B1 (en) 1998-02-25 1998-02-25 Semiconductor processing methods
US09/885,393 Expired - Lifetime US6878507B2 (en) 1998-02-25 2001-06-19 Semiconductor processing methods
US10/277,437 Abandoned US20030054294A1 (en) 1998-02-25 2002-10-21 Semiconductor processing methods
US10/917,820 Abandoned US20050020055A1 (en) 1998-02-25 2004-08-13 Semiconductor processing methods
US11/214,998 Expired - Fee Related US7825443B2 (en) 1998-02-25 2005-08-29 Semiconductor constructions
US11/218,045 Expired - Fee Related US7626238B2 (en) 1998-02-25 2005-08-31 Semiconductor devices having antireflective material
US11/220,458 Abandoned US20070238207A1 (en) 1998-02-25 2005-09-06 Semiconductor constructions

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US09/030,618 Expired - Lifetime US6274292B1 (en) 1998-02-25 1998-02-25 Semiconductor processing methods
US09/885,393 Expired - Lifetime US6878507B2 (en) 1998-02-25 2001-06-19 Semiconductor processing methods
US10/277,437 Abandoned US20030054294A1 (en) 1998-02-25 2002-10-21 Semiconductor processing methods

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US11/214,998 Expired - Fee Related US7825443B2 (en) 1998-02-25 2005-08-29 Semiconductor constructions
US11/218,045 Expired - Fee Related US7626238B2 (en) 1998-02-25 2005-08-31 Semiconductor devices having antireflective material
US11/220,458 Abandoned US20070238207A1 (en) 1998-02-25 2005-09-06 Semiconductor constructions

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US7804115B2 (en) 1998-02-25 2010-09-28 Micron Technology, Inc. Semiconductor constructions having antireflective portions
US6268282B1 (en) 1998-09-03 2001-07-31 Micron Technology, Inc. Semiconductor processing methods of forming and utilizing antireflective material layers, and methods of forming transistor gate stacks
US6294459B1 (en) 1998-09-03 2001-09-25 Micron Technology, Inc. Anti-reflective coatings and methods for forming and using same
US6828683B2 (en) 1998-12-23 2004-12-07 Micron Technology, Inc. Semiconductor devices, and semiconductor processing methods
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