JP5328083B2 - 酸化物のエッチング方法 - Google Patents
酸化物のエッチング方法 Download PDFInfo
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- JP5328083B2 JP5328083B2 JP2006209859A JP2006209859A JP5328083B2 JP 5328083 B2 JP5328083 B2 JP 5328083B2 JP 2006209859 A JP2006209859 A JP 2006209859A JP 2006209859 A JP2006209859 A JP 2006209859A JP 5328083 B2 JP5328083 B2 JP 5328083B2
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- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 108
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 90
- 229910052738 indium Inorganic materials 0.000 claims description 41
- 229910052725 zinc Inorganic materials 0.000 claims description 27
- 229910052733 gallium Inorganic materials 0.000 claims description 24
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
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- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- YASYEJJMZJALEJ-UHFFFAOYSA-N Citric acid monohydrate Chemical compound O.OC(=O)CC(O)(C(O)=O)CC(O)=O YASYEJJMZJALEJ-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
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- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 238000005229 chemical vapour deposition Methods 0.000 description 1
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- 229940005991 chloric acid Drugs 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1804—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic System
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/06—Etching, surface-brightening or pickling compositions containing an inorganic acid with organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/7869—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
- H01L29/78693—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate the semiconducting oxide being amorphous
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022466—Electrodes made of transparent conductive layers, e.g. TCO, ITO layers
- H01L31/022475—Electrodes made of transparent conductive layers, e.g. TCO, ITO layers composed of indium tin oxide [ITO]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022466—Electrodes made of transparent conductive layers, e.g. TCO, ITO layers
- H01L31/022483—Electrodes made of transparent conductive layers, e.g. TCO, ITO layers composed of zinc oxide [ZnO]
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/547—Monocrystalline silicon PV cells
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Description
以下に示す実施例1では、本発明のIZO、IGZO、IGO及びITOを含み構成されるインジウム酸化膜のエッチング方法の具体的な例を説明する。尚、以下の実施例は本発明の範囲内の好ましい条件により、説明している。
(室温)酢酸濃度:20〜68重量%(水分対酢酸原液:0.5〜4倍)
(室温)クエン酸濃度:3.8〜45重量%、更に好ましくは3.8〜29重量%
(50℃)クエン酸濃度:16〜45重量%
(室温)塩酸濃度:0.7〜8.5重量%(水分対塩酸原液:4〜60倍)、更に好ましくは1.0〜8.5重量%(水分対塩酸原液:4〜40倍)、最も好ましくは1.4〜4重量%(水分対塩酸原液:10〜30倍)
(室温)過塩素酸濃度:5〜44重量%(水分対過塩素酸原液:1〜20倍)
(室温)酢酸濃度:20〜68重量%(水分対酢酸原液:0.5〜4倍)
(室温)クエン酸濃度:3.8〜45重量%
(50℃)クエン酸濃度:16〜45重量%
(室温)塩酸濃度:0.7〜8.5重量%(水分対塩酸原液:4〜60倍)、更に好ましくは2.0〜8.5重量%(水分対塩酸原液:4〜20倍)、
(室温)過塩素酸濃度:5〜44重量%(水分対過塩素酸原液:1〜20倍)、更に好ましくは5〜21重量%(水分対過塩素酸原液:4〜20倍)
(室温)酢酸濃度:34〜68重量%(水分対酢酸原液:0.5〜2倍)
(室温)クエン酸濃度:3.8〜45重量%
(50℃)クエン酸濃度:16〜45重量%
(室温)塩酸濃度:不適
(室温)過塩素酸濃度:21〜70重量%(水分対過塩素酸原液:0〜4倍)
図11(a)、(b)は本発明の実施例による最も一般的なエッチング形態を示す。層1はよりエッチング速度が遅い材料層、層2はよりエッチング速度が速い材料層、層3レジスト層はエッチングマスクとして使われる。通常、図11の層1、層2の選択比が低い場合、図11の層1の過剰なエッチング深さΔdと層2のアンダーカット量Δwは近く、エッチングにより薄膜トランンジスタ素子のバラツキ問題が生じる。実施例1のエッチング液を用いることで、インジウムを含む酸化物のエッチング速度の速さは、IZO、IGZO、IGO、ITOの順になることがわかった。本発明により、図11の層1はITO層の場合、層2はIZO、IGZO及びIGOから成る群より選択された一材料であれば、層2が層1に対してほぼ2桁以上という高選択性エッチング効果が得られる。ただし、この場合、クエン酸でのエッチング選択比は1桁ぐらいしか得られない。また、図11の層1がIGO層の場合、層2はIZO及びIGZO二つ材料のうちのどちらかの一材料であれば、層2が層1に対して1桁ぐらいの高選択性のエッチング効果も得られる。また、図11の層1がIGZO層の場合、層2がIZOであれば、IZO対IGZOの選択性エッチングも可能となる。上記実施例のエッチングを行うことにより、前記層2のみをエッチングし、前記層1でぴたりとそのエッチングを止めることができる。従来のエッチング方法において生じる電極抵抗のバラツキの問題を解決することができ、TFT素子の特性を均一化することができる。
図12は本発明の一実施形態によるTop gate bottom contact式の薄膜トランジスタ断面概略図である。4は基板(例えばガラス基板)、5はドレーン電極、6はソース電極、7は活性層(チャネル層)、8はゲート絶縁膜、9はゲート電極である。また、Lはチャネル長である。図14は実施例1によるエッチング液を用いて、図12のようなTop gate bottom contact式の薄膜トランジスタの作製工程を説明する断面概略図である。図14(a)に示すように、基板4として500mm厚さのガラス(Corning社製、製品名:Corning 1737 glass、転移温度640℃)を用いた。そして、その基板表面に膜厚250nmの多結晶ITOを反応スパッタ法で成膜し、ドレーン電極5、ソース電極6をドライエッチングでパターニングする。次に、図14(b)に示すように、その上には活性層(チャネル層)7として膜厚100nmのIGZO酸化膜層を反応スパッタ法で成膜する。上記IGZO酸化膜はIn−Ga−Zn−Oを含み構成され、結晶状態における組成がInGaO3(ZnO)m(mは6未満の自然数)で表される。及び、上記透明IGZO酸化膜は、膜内に微結晶を含有し、電子キャリア濃度が1018/cm3未満であることを特徴とする透明アモルファス半導体酸化物膜である。
図13は本発明のもうひとつ実施形態によるBottom gate top contact式の薄膜トランジスタ断面概略図である。4は基板(例えばガラス基板)、5はドレーン電極、6はソース電極、7は活性層(チャネル層)、8はゲート絶縁膜、9はゲート電極である。Lはチャネル長である。図15は実施例1によるエッチング液を用いて、図13のようなBottom gate top contact式の薄膜トランジスタの作製工程を説明する断面概略図である。基板4として500mm厚さのガラス(Corning社製、製品名:Corning 1737 glass、転移温度640℃)を用いて、基板4表面に膜厚100nmのIGO層(ゲート電極層9)を反応スパッタ法で成膜する。フォトリソグラフィ法でゲート電極層9(IGO)表面にレジストをエッチングマスクとしてパターニングする。次にゲート電極層9(IGO)を濃度4.0重量%の希塩酸エッチング液でパターニングし、レジストを除去する。次に反応スパッタ法で成膜する膜厚100nmシリコン窒化膜(Si3N4)をゲート絶縁膜8として、フォトリソグラフィ法とドライエッチング法でゲート電極層9の表面上にパターニングする。図15(a)は、前記ドライエッチング後にレジストを除去した概略断面図である。ちなみにTop gate bottom contact式TFTと同じように、シリコン窒化膜の代わりにゲート絶縁膜層8として、例えば、酸化シリコン、もしくは窒化酸化シリコン、HfO2、HfAlO、HfSiON、Y2O3等の誘電体材料を用いることも可能である。その後の配線及びゲート電圧を印加するために、ゲート電極9を完全にゲート絶縁膜8で覆うのではなく、Contact padとして一部のゲート電極9を露出することが必要である。上記ゲート電極9のContact padが図15(a)の紙面垂直方向にあるが、図15(a)には示していない。
2 よりエッチング速度が速い材料
3 フォトレジスト
4 基板(例えば、ガラス基板)
5 ドレーン電極
6 ソース電極
7 活性層(チャネル層)
8 ゲート絶縁膜
9 ゲート電極
Claims (3)
- ITO層と、In、Ga、及びZnから選ばれる少なくとも1つを含むアモルファス酸化物層と、を含む構造体のエッチング方法であって、
クエン酸又は過塩素酸のいずれか一種を含むエッチング液を用いて、前記アモルファス酸化物層を選択的にエッチングする工程を含み、
前記エッチング液がクエン酸を含む場合には、前記エッチング液中の前記クエン酸の濃度が3.8〜29重量%であり、
前記エッチング液が過塩素酸を含む場合には、前記エッチング液中の前記過塩素酸の濃度が5〜44重量%であることを特徴とする酸化物のエッチング方法。 - InとGaを含む酸化物層と、InとZn、又はInとGaとZnを含むアモルファス酸化物層と、を含む構造体のエッチング方法であって、
酢酸、クエン酸、又は過塩素酸のいずれか一種を含むエッチング液を用いて、前記アモルファス酸化物層を選択的にエッチングする工程を含み、
前記エッチング液が酢酸を含む場合には、前記エッチング液中の酢酸の濃度が20〜68重量%であり、
前記エッチング液がクエン酸を含む場合には、前記エッチング液中の前記クエン酸の濃度が3.8〜45重量%であり、
前記エッチング液が過塩素酸を含む場合には、前記エッチング液中の前記過塩素酸の濃度が5〜44重量%であることを特徴とする酸化物のエッチング方法。 - InとGaとZnを含む酸化物層と、InとZnを含むアモルファス酸化物層と、を含む構造体のエッチング方法であって、
酢酸、クエン酸、塩酸又は過塩素酸のいずれか一種を含むエッチング液を用いて、前記アモルファス酸化物層を選択的にエッチングする工程を含み、
前記エッチング液が酢酸を含む場合には、前記エッチング液中の酢酸の濃度が34〜68重量%であり、
前記エッチング液がクエン酸を含む場合には、前記エッチング液中の前記クエン酸の濃度が3.8〜45重量%であり、
前記エッチング液が過塩素酸を含む場合には、前記エッチング液中の前記過塩素酸の濃度が21〜70重量%であることを特徴とする酸化物のエッチング方法。
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US20090149030A1 (en) | 2009-06-11 |
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US8168544B2 (en) | 2012-05-01 |
WO2008015944A1 (en) | 2008-02-07 |
CN101496183A (zh) | 2009-07-29 |
TWI378510B (en) | 2012-12-01 |
CN101496183B (zh) | 2012-02-01 |
JP2008041695A (ja) | 2008-02-21 |
EP2050144B1 (en) | 2013-05-29 |
KR20090042831A (ko) | 2009-04-30 |
EP2050144A1 (en) | 2009-04-22 |
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