WO2013187486A1 - 薄膜トランジスタ、薄膜トランジスタの製造方法および半導体装置 - Google Patents
薄膜トランジスタ、薄膜トランジスタの製造方法および半導体装置 Download PDFInfo
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- WO2013187486A1 WO2013187486A1 PCT/JP2013/066384 JP2013066384W WO2013187486A1 WO 2013187486 A1 WO2013187486 A1 WO 2013187486A1 JP 2013066384 W JP2013066384 W JP 2013066384W WO 2013187486 A1 WO2013187486 A1 WO 2013187486A1
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- Prior art keywords
- film transistor
- thin film
- semiconductor layer
- oxide
- manufacturing
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 128
- 239000010409 thin film Substances 0.000 title claims abstract description 101
- 238000004519 manufacturing process Methods 0.000 title claims description 46
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 35
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 27
- 229910052738 indium Inorganic materials 0.000 claims abstract description 15
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 53
- 239000007789 gas Substances 0.000 claims description 43
- 125000004429 atom Chemical group 0.000 claims description 35
- 229910052751 metal Chemical group 0.000 claims description 29
- 239000002184 metal Chemical group 0.000 claims description 29
- 239000000758 substrate Substances 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- 229910003437 indium oxide Inorganic materials 0.000 claims description 15
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 14
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 13
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical group O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 claims description 13
- 229910001930 tungsten oxide Inorganic materials 0.000 claims description 13
- 239000012212 insulator Substances 0.000 claims description 10
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 10
- 229910052721 tungsten Inorganic materials 0.000 claims description 10
- 239000010937 tungsten Substances 0.000 claims description 10
- 238000005240 physical vapour deposition Methods 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000004544 sputter deposition Methods 0.000 description 20
- 239000010408 film Substances 0.000 description 19
- 229910007541 Zn O Inorganic materials 0.000 description 13
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 11
- 239000000203 mixture Substances 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000013078 crystal Substances 0.000 description 7
- 239000010931 gold Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 125000004430 oxygen atom Chemical group O* 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000011787 zinc oxide Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000005401 electroluminescence Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000011368 organic material Substances 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 229910001195 gallium oxide Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229920001748 polybutylene Polymers 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 238000005546 reactive sputtering Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910017083 AlN Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000007737 ion beam deposition Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 238000001659 ion-beam spectroscopy Methods 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000001552 radio frequency sputter deposition Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/0021—Reactive sputtering or evaporation
- C23C14/0036—Reactive sputtering
-
- 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
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/08—Oxides
- C23C14/086—Oxides of zinc, germanium, cadmium, indium, tin, thallium or bismuth
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/3407—Cathode assembly for sputtering apparatus, e.g. Target
- C23C14/3414—Metallurgical or chemical aspects of target preparation, e.g. casting, powder metallurgy
Definitions
- the present invention relates to a thin film transistor, a method for manufacturing the thin film transistor, and a semiconductor device.
- This application claims priority based on Japanese Patent Application No. 2012-134940 filed in Japan on June 14, 2012, the contents of which are incorporated herein by reference.
- Thin film transistors are widely used as switching elements for liquid crystal displays and organic electroluminescence (EL) displays that employ an active matrix drive system.
- TFT a semiconductor layer (channel layer) using amorphous silicon or polysilicon
- TFTs using In (indium) -Zn (zinc) -O-based metal oxides or In-Ga (gallium) -Zn-O-based metal oxides for the semiconductor layer in order to improve various characteristics.
- a thin film transistor using a metal oxide material for forming the semiconductor layer may be referred to as "oxide film transistor”.
- an oxide film transistor Since such an oxide film transistor has n-type conductivity and exhibits higher channel mobility than amorphous silicon or polysilicon, it can be suitably used as a switching element for a high-definition display or a large-screen display.
- the semiconductor layer made of a metal oxide does not exhibit p-type conduction in principle and the off current is extremely small, the use of an oxide film transistor has the advantage that power consumption can be reduced.
- Zn contained easily reacts with moisture in the air.
- the characteristic change is likely to occur after the fabrication of the oxide film transistor.
- it is necessary to protect the semiconductor layer of the oxide film transistor, which increases the process load.
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a thin film transistor in which a change in characteristics is suppressed using a novel semiconductor material. It is another object of the present invention to provide a method for manufacturing a thin film transistor using a novel semiconductor material in which a change in characteristics is suppressed. It is another object to provide a semiconductor device having such a thin film transistor.
- a thin film transistor includes a source electrode and a drain electrode, a semiconductor layer provided in contact with the source electrode and the drain electrode, and the source electrode and the drain electrode.
- a gate electrode provided corresponding to a channel between the gate electrode and an insulator layer provided between the gate electrode and the semiconductor layer, wherein the semiconductor layer is formed of indium and an atomic number It is a complex metal oxide containing 73 or more metal atoms.
- the surface of the semiconductor layer may have a root mean square roughness measured by an atomic force microscope of 1.0 nm or less.
- the semiconductor layer may have a thickness of 20 nm or less.
- the metal atom having an atomic number of 73 or more may be tungsten.
- the thin film transistor manufacturing method includes a composite metal oxide containing indium and the metal atom having an atomic number of 73 or more by a physical vapor deposition method using a target and a process gas.
- the oxide of the atomic number 73 or more metal atoms it is also possible tungsten oxide.
- the content of the tungsten oxide contained in the sintered body may be 10% by mass or less.
- the step of forming the semiconductor layer may be performed at 10 ° C. or higher 100 ° C. or less.
- the thin film transistor according to another aspect of the present invention is manufactured by the above-described thin film transistor manufacturing method.
- a semiconductor device includes a substrate and the above thin film transistor.
- a thin film transistor in which a change in characteristics is suppressed using a novel semiconductor material can be provided.
- a method for manufacturing a thin film transistor in which a change in characteristics is suppressed using a novel semiconductor material can be provided.
- a semiconductor device including such a thin film transistor can be provided.
- the thin film transistor of this embodiment includes a source electrode and a drain electrode, a semiconductor layer provided in contact with the source electrode and the drain electrode, and a gate provided corresponding to a channel between the source electrode and the drain electrode.
- a material for forming the semiconductor layer is a composite metal oxide containing indium and a metal atom having an atomic number of 73 or more.
- a semiconductor layer made of a composite metal oxide containing indium and the metal atom having the atomic number of 73 or more is formed by physical vapor deposition using a target and a process gas.
- the target is a sintered body containing indium oxide powder and metal atom oxide powder having an atomic number of 73 or more.
- the process gas is a mixed gas of a rare gas and oxygen and does not include a compound having a hydrogen atom.
- the thin film transistor of this embodiment is manufactured by the above-described thin film transistor manufacturing method.
- the semiconductor device of this embodiment includes a substrate and a thin film transistor provided on the substrate.
- the thin film transistor is a thin film transistor manufactured by the above-described thin film transistor or the above-described thin film transistor manufacturing method. Hereinafter, it demonstrates in order.
- FIG. 1 is a schematic cross-sectional view of a thin film transistor 1 and a semiconductor device 100 according to this embodiment.
- the semiconductor device 100 of this embodiment includes a substrate 2 and the thin film transistor 1 of this embodiment formed on the substrate 2.
- the semiconductor device 100 may have a wiring or an element (not shown) that is electrically connected to the thin film transistor 1.
- a substrate formed of a known forming material can be used, and any of those having light transmission properties and those having no light transmission properties can be used.
- Various substrates such as a resin substrate made of a polyester resin such as terephthalate) or a paper substrate can be used.
- the substrate may be a composite material formed by combining a plurality of these materials. The thickness of the substrate 2 can be appropriately set according to the design.
- the thin film transistor 1 is a so-called bottom gate type transistor.
- the thin film transistor 1 includes a gate electrode 3 provided on a substrate 2, an insulator layer 4 provided to cover the gate electrode 3, a semiconductor layer 5 provided on the upper surface of the insulator layer 4, It has a source electrode 6 and a drain electrode 7 provided in contact with the semiconductor layer 5 on the upper surface.
- the gate electrode 3 is provided corresponding to the channel region A of the semiconductor layer 5 (at a position overlapping the channel region A in a plan view).
- the gate electrode 3, the source electrode 6, and the drain electrode 7, those formed of a generally known material can be used.
- the material for forming these electrodes include aluminum (Al), gold (Au), silver (Ag), copper (Cu), nickel (Ni), molybdenum (Mo), tantalum (Ta), and tungsten (W).
- the material for forming these electrodes include aluminum (Al), gold (Au), silver (Ag), copper (Cu), nickel (Ni), molybdenum (Mo), tantalum (Ta), and tungsten (W).
- metal materials such as these and alloys thereof; conductive oxides such as indium tin oxide (ITO) and zinc oxide (ZnO).
- ITO indium tin oxide
- ZnO zinc oxide
- These electrodes may have a double- or more layered structure, the layered structure, for example, the surface may be formed by plating a metal material.
- the source electrode 6, drain electrode 7 may be those formed by the same formation material, or may be formed of different formation materials. Since manufacture becomes easy, it is preferable that the source electrode 6 and the drain electrode 7 are the same formation material.
- the insulator layer 4 is formed using either an inorganic material or an organic material as long as it has insulating properties and can electrically insulate the gate electrode 3 from the source electrode 6 and the drain electrode 7. May be.
- the inorganic material include generally known insulating oxides such as SiO 2 , SiN x , SiON, Al 2 O 3 , and AlN, nitrides, and oxynitrides.
- the organic material include acrylic resin, epoxy resin, silicone resin, and fluorine resin.
- the organic material is preferably a photocurable resin material because it is easy to manufacture and process.
- the semiconductor layer 5 is made of a composite metal oxide containing indium and a metal atom having an atomic number of 73 or more. That is, the semiconductor layer 5 contains the composite metal oxide.
- the metal atom having an atomic number of 73 or more contained in the semiconductor layer 5 is preferably a metal atom belonging to the sixth period in the periodic table. Specific examples of such metal atoms include tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), and mercury (Hg). ), Thallium (Tl), and lead (Pb). Among these, tungsten is more preferable.
- the ratio (percentage) of the content (number of atoms) of the metal atom having an atomic number of 73 or more to the total amount (number of atoms) of the metal atom having an atomic number of 73 or more and indium is preferably 0. 5 to 10 atomic%.
- the remainder other than the metal atom having an atomic number of 73 or more is indium, oxygen atoms, and inevitable impurities.
- the ratio (percentage) of the tungsten content (number of atoms) to the total amount (number of atoms) of tungsten and indium in the composite metal oxide is preferably 0.00. It is 5 to 10 atomic%, and more preferably 0.5 to 2 atomic%.
- metal atoms having an atomic number of 73 or more suppress local crystallization of indium oxide during the formation of the semiconductor layer, and indium oxide tends to be in an amorphous state. As a result, the flatness of the film surface is also increased. Therefore, the semiconductor layer 5 is in a homogeneous amorphous state.
- In-Zn-O-based metal oxides and In-Ga-Zn-O-based metal oxides which are generally known oxide semiconductors, zinc oxide contained in large amounts are easily altered by water. Therefore, a thin film transistor in which a semiconductor layer is formed using these oxide semiconductors needs to appropriately protect the semiconductor layer and suppress deterioration.
- the semiconductor layer 5 of the thin film transistor 1 of the present embodiment does not need protection because it does not contain zinc oxide, which is easily altered by water.
- both dry etching and wet etching can be employed, so that the degree of freedom of the process is increased.
- the semiconductor layer 5 of the thin film transistor 1 of the present embodiment does not contain Ga with a high raw material unit price, the cost related to the target at the time of manufacturing can be reduced, and the manufacturing cost of the thin film transistor can also be reduced.
- the surface of the semiconductor layer 5 has a root mean square roughness (Rq) measured by an atomic force microscope of 1.0 nm or less. Since Rq is ideally 0 nm, the lower limit value of Rq is 0 nm.
- the upper limit of Rq is preferably 0.7 nm or less, more preferably 0.5 nm or less, and still more preferably 0.3 nm or less.
- the root mean square roughness (Rq) is an observation image obtained by measuring a measurement area of 5 ⁇ m ⁇ 5 ⁇ m using an atomic force microscope (manufactured by SII, model number SPI5000, tapping mode observation). The value calculated using.
- the thickness of the semiconductor layer 5 is preferably 20 nm or less, and more preferably 10 nm or less.
- the thickness of the semiconductor layer 5 is measured by using a crystal oscillation type film thickness meter disposed mainly in the sputtering chamber for forming the semiconductor layer 5 for the purpose of film thickness calibration.
- the In-Zn-O-based metal oxide or In-Ga-Zn-O-based metal oxide tends to polycrystalline form at the time of forming the semiconductor layer. For this reason, in a conventionally known oxide film transistor, the surface of the semiconductor layer does not become so flat as to exhibit the above-mentioned root mean square roughness due to crystal grains contained in the semiconductor layer. Further, the semiconductor layer of the commonly known oxide film transistor, due to such crystal grains, the electrical conductivity in the plane direction is decreased.
- a film is used in order to form a continuous layer in the plane direction (in order not to form a discontinuous region) and to ensure conductivity.
- the thickness is 30 to 80 nm.
- the surface exhibits a root mean square roughness as described above, a very flat surface. For this reason, even if the semiconductor layer 5 is formed thin, it is difficult to be discontinuous.
- the semiconductor layer made of a generally known oxide semiconductor unlike the above-described semiconductor layer made of a generally known oxide semiconductor, a phenomenon in which crystal grains locally grow inside the formed semiconductor layer 5 hardly occurs, and the electric conductivity caused by the crystal grains is not generated. There is no decline.
- the thickness of the semiconductor layer 5 can be reduced as described above. Thereby, the material cost which forms the semiconductor layer 5 can be suppressed. Furthermore, since the time required for forming the semiconductor layer can be shortened as compared with a conventionally known oxide film transistor, the manufacturing time can be shortened.
- the thin film transistor 1 and the semiconductor device 100 of the present embodiment are configured as described above.
- the semiconductor layer of the thin film transistor of this embodiment can also be formed by using physical vapor deposition (or physical vapor deposition).
- examples of physical vapor deposition include vapor deposition and sputtering.
- the vapor deposition method, vacuum deposition method, molecular beam deposition (MBA), ion plating method can be exemplified an ion beam deposition method.
- examples of the sputtering method include conventional sputtering, magnetron sputtering, ion beam sputtering, ECR (electron cyclotron resonance) sputtering, and reactive sputtering.
- reactive sputtering method DC (direct current) sputtering method, a film formation method such as a radio frequency (RF) sputtering.
- RF radio frequency
- a thin film transistor using the following manufacturing method.
- the following manufacturing method is used, a higher quality thin film transistor can be manufactured.
- the gate electrode 3 and the insulator layer 4 are formed on the substrate 2 by a generally known method, and then the semiconductor layer 5 is formed.
- the semiconductor layer 5 is manufactured by physical vapor deposition using a target and a process gas.
- the target is a sintered body containing indium oxide powder and metal atom oxide powder having an atomic number of 73 or more.
- the process gas is a mixed gas of a rare gas and oxygen and does not include a compound having a hydrogen atom.
- a sputtering method as a physical vapor deposition method.
- the ratio (percentage) of the content (number of atoms) of metal atoms having an atomic number of 73 or more to the total amount (number of atoms) of metal atoms having an atomic number of 73 or more and indium is preferably 0.5. ⁇ 10 atomic%.
- the remainder other than the metal atom having an atomic number of 73 or more is indium, oxygen atoms, and inevitable impurities.
- the composition of the semiconductor layer 5 to be formed (the composition of elements other than oxygen atoms) and the composition of the target (the composition of elements other than oxygen atoms) are the same or substantially the same.
- a target having substantially the same composition (composition of elements other than oxygen atoms) as the composition of the target semiconductor layer 5 (composition of elements other than oxygen atoms).
- tungsten oxide includes W 2 O 3 , WO 2 , and WO 3 .
- W 2 O 3 and WO 2 may be mixed in a trace amount, but the composition of tungsten oxide is WO 3 without changing.
- a tungsten oxide, WO 3, or W 2 O 3 and WO 2 means a WO 3 were mixed in trace amounts.
- the target may be mixed with impurities such as additives (metal oxide, etc.) in an amount equal to or less than the content (mass%) of tungsten oxide.
- impurities such as additives (metal oxide, etc.) in an amount equal to or less than the content (mass%) of tungsten oxide.
- a metal oxide (such as zinc oxide) other than indium oxide and tungsten oxide may be mixed into the target at a ratio equal to or lower than the content of tungsten oxide as an unintentional impurity.
- the ratio (percentage) of the tungsten content (number of atoms) to the total amount (number of atoms) of tungsten and indium in the sintered body is preferably 0.5 to 10 atomic%, more preferably 0. .5 to 2 atomic%.
- In-Zn-O-based metal oxides and In-Ga-Zn-O-based metal oxides which are commonly known oxide semiconductors
- indium oxide is used as a “host material”
- zinc oxide or gallium oxide is used as a “guest”.
- a guest material zinc oxide or gallium oxide in an amount of 20 to 30% (20 to 30%) is mixed with the amount of the host material (indium oxide).
- the semiconductor layer 5 of the thin film transistor 1 of the present embodiment is formed using the sintered body as described above as a target. Therefore, in the thin film transistor 1 manufactured by the manufacturing method according to the present embodiment, the oxide semiconductor of the semiconductor layer 5 has a guest material (indium oxide) content relative to the content of the host material (indium oxide) as compared with a conventionally known oxide semiconductor. The ratio of the content of (tungsten oxide) is extremely small.
- a mixed gas of a rare gas and oxygen is used as a process gas.
- the rare gas include helium, neon, argon, krypton, and xenon.
- the amount (volume ratio) of oxygen gas in the process gas is preferably 8.5 to 12% by volume.
- the process gas does not include a compound having a hydrogen atom.
- “not containing a compound having a hydrogen atom” means that a compound having a hydrogen atom such as water (H 2 O) or hydrogen gas (H 2 ) is not intentionally mixed in the process gas. . In this way of thinking, it is not excluded that the gas to be used or moisture or hydrogen gas existing in a minute amount in the work environment is unintentionally mixed in the process gas.
- a hydrogen atom (proton) is mixed into the inside of the film formed by sputtering.
- the semiconductor layer contains such hydrogen atoms
- the hydrogen atoms move in the semiconductor layer due to the current supplied when the transistor is driven, and the properties of the semiconductor layer are not stable. Therefore, in a thin film transistor having a semiconductor layer containing hydrogen atoms, the threshold voltage, which is the minimum gate voltage at which current begins to flow between two electrodes (source-drain), varies, and the operation is difficult to stabilize.
- the formed semiconductor layer contains metal atoms having an atomic number of 73 or more, and the metal atoms undergo local crystal growth. Suppress. Therefore, as in the above In-Zn-O-based metal oxide or In-Ga-Zn-O-based metal oxide, there is no need to include water in the process gas. Therefore, in the method for manufacturing a thin film transistor of this embodiment, a gas that contains a rare gas and oxygen and does not contain a gas component containing hydrogen atoms such as water and hydrogen can be used as a process gas.
- a step of forming a semiconductor layer can be formed suitably semiconductor layer by performing at 10 ° C. or higher 100 ° C. or less. Further, the step of forming the semiconductor layer is preferably performed at room temperature.
- “implemented at room temperature” means that the semiconductor layer is not heated for the step of forming the semiconductor layer, and the temperature adjustment of the working environment is unnecessary.
- the sputtering method employed in the method of manufacturing the thin film transistor of the present embodiment it is possible to use a known, RF sputtering, AC sputtering, DC sputtering.
- the target may be a sintered body of a mixture of these powders as long as it uses indium oxide powder and metal oxide oxide powder having an atomic number of 73 or more. It may be a sintered body.
- the semiconductor layer can be formed by co-sputtering using a plurality of sintered bodies. The manufacturing method of the thin film transistor of this embodiment is as described above.
- the thin film transistor in which the characteristic change is suppressed has high reliability.
- top contact type thin film transistor has been described.
- present invention can also be applied to a so-called bottom contact type thin film transistor.
- Example 1 the thin film transistor 10 shown in FIG. 2 was manufactured and the operation was confirmed.
- the thin film transistor 10 shown in FIG. 2 has the same structure as that of the thin film transistor 1 shown in FIG. 1, and instead of the gate electrode 3 included in the thin film transistor 1 shown in FIG. 1, a Si layer 8 doped with a large amount of p-type impurities is used. It has been.
- the thin film transistor 10 of the example was manufactured as follows.
- the insulator layer 4 was formed by oxidizing the surface using a Si substrate doped with a p-type impurity.
- the semiconductor layer 5 was formed on the surface of the insulator layer 4 using a method described later.
- the source electrode 6 and the drain electrode 7 were formed by mask vapor deposition on the surface of the semiconductor layer 5.
- the source electrode 6 and the drain electrode 7 used gold (Au) as a forming material and had a thickness of 40 nm. Further, the separation distance (gate length) between the source electrode 6 and the drain electrode 7 was 350 ⁇ m, and the length of the facing portion was 940 ⁇ m.
- the semiconductor layer 5 is formed by a sputtering method (DC sputtering) under the following sputtering conditions using an IWO target (manufactured by Sumitomo Metal Mining Co., Ltd.) as a target material using a sputtering apparatus (manufactured by Shinko Seiki Co., Ltd., STV4321 type). did.
- an IWO target an In 2 O 3 -based sample product to which 1% by mass of tungsten oxide (WO 3 ) was added was used.
- the thickness of the deposited semiconductor layer 5 was 10 nm.
- the root mean square roughness of the surface of the formed semiconductor layer was measured with an atomic force microscope (manufactured by SII, model number SPI5000, tapping mode observation). The root mean square roughness of the surface was 0.24 nm.
- FIG. 3 is a graph showing the results of measuring the characteristics of the thin film transistor 10.
- FIG. 3A shows the transfer characteristics
- FIG. 3B shows the output characteristics.
- the field-effect mobility was 1.18 cm 2 / Vs. Further, the ratio (Ion / Ioff) between the drive current (Ion) and the leak current (Ioff) was 10 7 or more, and it was found that the leak current was very small. Furthermore, the threshold voltage was 26V. The threshold voltage can be adjusted by adjusting the characteristics of the semiconductor layer by changing the film formation conditions, the film thickness, and the like of the semiconductor layer. The subthreshold coefficient (S value) was 0.44 V / decade. Therefore, the operation of the thin film transistor of this example was confirmed.
- FIG. 4 is a graph showing the relationship between the partial pressure of oxygen in the process gas and the conductivity of the formed semiconductor layer 5.
- the conductivity of the semiconductor layer 5 was less than 10 ⁇ 9 S / cm.
- the conductivity of the semiconductor layer 5 was about 10 ⁇ 6 S / cm or more.
- the conductivity of the semiconductor layer 5 was about 10 ⁇ 8 S / cm.
- Example 2 The semiconductor layer 5 is formed in the same manner as in Example 1 except that a target composed of 3 % by mass or 5% by mass of tungsten oxide (WO 3 ) and indium oxide (In 2 O 3 ) is used as the IWO target.
- WO 3 tungsten oxide
- In 2 O 3 indium oxide
- the characteristic change of the thin film transistor of this embodiment is suppressed. Further, in the method for manufacturing the thin film transistor of this embodiment, it is not necessary to protect the semiconductor layer in order to prevent characteristic changes, and the process load is small. Furthermore, since Ga is not included, the cost concerning a target can be reduced. For this reason, this embodiment is preferably applicable to the manufacturing process of the switching element of a liquid crystal display or an organic electroluminescence (Electro Luminescence (EL)) display.
- EL Electro Luminescence
- 1, 10 thin film transistor, 2: substrate, 3: gate electrode, 4: insulator layer, 5: semiconductor layer, 6: source electrode, 7: drain electrode, 8: Si layer, 100: semiconductor device.
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Abstract
Description
本願は、2012年6月14日に、日本に出願された特願2012-134940号に基づき優先権を主張し、その内容をここに援用する。
以下、順に説明する。
図1は、本実施形態に係る薄膜トランジスタ1および半導体装置100の概略断面図である。
図に示すように、本実施形態の半導体装置100は、基板2と、基板2上に形成された本実施形態の薄膜トランジスタ1とを備えている。半導体装置100は、その他に薄膜トランジスタ1と電気的に接続する不図示の配線や素子を有していてもよい。
基板2の厚さは、設計に応じて適宜設定することができる。
複合金属酸化物において、原子番号が73以上の金属原子とインジウムの合計量(原子数)に対する原子番号が73以上の金属原子の含有量(原子数)の比(百分率)は、好ましくは0.5~10原子%である。原子番号が73以上の金属原子以外の残部は、インジウム、酸素原子、及び不可避不純物である。
原子番号が73以上の金属原子がタングステンである場合、複合金属酸化物において、タングステンとインジウムの合計量(原子数)に対するタングステンの含有量(原子数)の比(百分率)は、好ましくは0.5~10原子%であり、更に好ましくは0.5~2原子%である。
Rqの上限は、好ましくは0.7nm以下であり、より好ましくは0.5nm以下であり、さらに好ましくは0.3nm以下である。
本実施形態の薄膜トランジスタ1および半導体装置100は、以上のような構成となっている。
次に、本実施形態の薄膜トランジスタ1の製造方法について説明する。本実施形態の薄膜トランジスタの半導体層は、物理蒸着法(または物理気相成長法)を用いることにより形成することも可能である。
形成される半導体層5の組成(酸素原子以外の元素の組成)と、ターゲットの組成(酸素原子以外の元素の組成)とは、同一又はほぼ同一となる。このため、目的とする半導体層5の組成(酸素原子以外の元素の組成)とほぼ同一の組成(酸素原子以外の元素の組成)を有するターゲットを用意することが好ましい。
例えば、半導体層5としてIn-W-O系の金属酸化物を採用する場合には、ターゲットとしては、酸化インジウムの粉末と、酸化タングステンの粉末との焼結体を採用するとよい。なお、酸化タングステンには、W2O3、WO2、WO3が存在する。このうち、WO3が最も安定であり、かつ安価に製造される。WO3の製造過程では、W2O3及びWO2が微量に混入する場合があるが、酸化タングステンの組成は変化せずWO3である。本実施形態では、酸化タングステンとは、WO3、又はW2O3及びWO2が微量に混入したWO3を意味する。
また、ターゲットには、酸化タングステンの含有量(質量%)以下の量で添加物(金属酸化物など)等の不純物が混入していてもよい。例えば、ターゲットに、意図しない不可避不純物として、酸化インジウムおよび酸化タングステン以外の金属酸化物(酸化亜鉛など)が、ターゲット全体における酸化タングステンの含有量以下の割合で混入することがあっても構わない。
プロセスガス中の酸素ガスの量(体積比率)は、好ましくは8.5~12体積%である。
本実施形態の薄膜トランジスタの製造方法は、以上のようになっている。
本実施例においては、図2に示す薄膜トランジスタ10を作製し、動作確認を行った。
図2に示す薄膜トランジスタ10は、図1に示した薄膜トランジスタ1と同様の構造を有し、図1の薄膜トランジスタ1が有するゲート電極3の代わりに、p型不純物を多量にドープしたSi層8が用いられている。
DC power :50W
真空度 :0.06Pa
プロセスガス流量 :Ar 3sccm/O2 0.5sccm
(sccm:Standard Cubic Centimeter per Minute)
基板温度 :23℃。加熱なし
また、駆動電流(Ion)とリーク電流(Ioff)との比(Ion/Ioff)が107以上であり、極めてリーク電流が少ないことが分かった。
さらに、閾値電圧は26Vであった。半導体層の成膜条件、膜厚などを変更することにより、半導体層の特性を調整することで、この閾値電圧の調整が可能である。
サブスレッショルド係数(S値)は0.44V/decadeであった。
従って、本実施例の薄膜トランジスタの動作確認ができた。
図4は、プロセスガス中の酸素分圧と、形成された半導体層5の導電率との関係を示すグラフである。
半導体層5の導電率(σ)と酸素分圧(P(O2))とは以下の関係式で表された。
σ=exp{-449×P(O2)-2.44}
プロセスガス中の酸素分圧が高くなるほど、半導体層5の導電率が低くなることがわかる。プロセスガス中の酸素分圧が0.04Pa超の場合、半導体層5の導電率が10-9S/cm未満となった。プロセスガス中の酸素分圧が0.028Pa未満の場合、半導体層5の導電率が約10-6S/cm以上となった。プロセスガス中の酸素分圧が0.03~0.038Paの場合、半導体層5の導電率は、約10-8S/cmとなった。
このように、プロセスガス中の酸素分圧を調整することによって、半導体層5を再現性良く形成できることが分かった。
IWOターゲットとして、3質量%又は5質量%の酸化タングステン(WO3)と、酸化インジウム(In2O3)とからなるターゲットを用いる以外は、実施例1と同様にして半導体層5を成膜し、薄膜トランジスタ10を作製した。
薄膜トランジスタ10の電気特性を測定した結果、電界効果移動度が良好な値であり、かつ極めてリーク電流が少ないことが分かった。従って、本実施例の薄膜トランジスタの動作確認ができた。
Claims (10)
- ソース電極およびドレイン電極と、
前記ソース電極および前記ドレイン電極に接して設けられた半導体層と、
前記ソース電極および前記ドレイン電極の間のチャネルに対応させて設けられたゲート電極と、
前記ゲート電極と前記半導体層との間に設けられた絶縁体層と、を備え、
前記半導体層の形成材料が、インジウムと、原子番号が73以上の金属原子と、を含む複合金属酸化物である薄膜トランジスタ。 - 前記半導体層の表面は、原子間力顕微鏡で測定した二乗平均平方根粗さが1.0nm以下である請求項1に記載の薄膜トランジスタ。
- 前記半導体層の厚さは、20nm以下である請求項1または2に記載の薄膜トランジスタ。
- 前記原子番号が73以上の金属原子が、タングステンである請求項1から3のいずれか1項に記載の薄膜トランジスタ。
- ターゲットと、プロセスガスと、を用いた物理蒸着法により、インジウムと前記原子番号が73以上の金属原子とを含む複合金属酸化物からなる半導体層を形成する工程を有し、
前記ターゲットは、酸化インジウムの粉末と、原子番号が73以上の金属原子の酸化物の粉末と、を含む焼結体であり、
前記プロセスガスは、希ガスと酸素との混合ガスであり水素原子を有する化合物を含まない薄膜トランジスタの製造方法。 - 前記原子番号が73以上の金属原子の酸化物が、酸化タングステンである請求項5に記載の薄膜トランジスタの製造方法。
- 前記焼結体に含まれる前記酸化タングステンの含有量が、10質量%以下である請求項6に記載の薄膜トランジスタの製造方法。
- 前記半導体層を形成する工程を、10℃以上100℃以下で行う請求項5から7のいずれか1項に記載の薄膜トランジスタの製造方法。
- 請求項5から8のいずれか1項に記載の薄膜トランジスタの製造方法により製造された薄膜トランジスタ。
- 基板と、前記基板に設けられた請求項1から4および請求項9のいずれか1項に記載の薄膜トランジスタと、を有する半導体装置。
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RU2660407C2 (ru) * | 2013-12-26 | 2018-07-06 | Рикох Компани, Лтд. | Оксидный полупроводник р-типа, композиция для получения оксидного полупроводника р-типа, способ получения оксидного полупроводника р-типа, полупроводниковый компонент, отображающий элемент, устройство отображения изображений и система |
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KR20140071491A (ko) | 2014-06-11 |
JPWO2013187486A1 (ja) | 2016-02-08 |
JP5846563B2 (ja) | 2016-01-20 |
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