JP2007250982A - 酸化物半導体を用いた薄膜トランジスタ及び表示装置 - Google Patents
酸化物半導体を用いた薄膜トランジスタ及び表示装置 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 72
- 239000010409 thin film Substances 0.000 title claims abstract description 44
- 150000004767 nitrides Chemical class 0.000 title 1
- 239000010408 film Substances 0.000 claims abstract description 93
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 58
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000001301 oxygen Substances 0.000 claims abstract description 48
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 229910021417 amorphous silicon Inorganic materials 0.000 claims abstract description 27
- 238000009826 distribution Methods 0.000 claims abstract description 15
- 238000005401 electroluminescence Methods 0.000 claims description 17
- 239000004973 liquid crystal related substance Substances 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- 229910052738 indium Inorganic materials 0.000 claims description 9
- 229910052733 gallium Inorganic materials 0.000 claims description 7
- 210000002858 crystal cell Anatomy 0.000 claims description 5
- 229910052718 tin Inorganic materials 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 82
- 239000011701 zinc Substances 0.000 description 21
- 229910020286 SiOxNy Inorganic materials 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 238000004544 sputter deposition Methods 0.000 description 13
- 229910004205 SiNX Inorganic materials 0.000 description 10
- 230000007547 defect Effects 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- 230000005669 field effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000000206 photolithography Methods 0.000 description 8
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 239000000470 constituent Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 229910007541 Zn O Inorganic materials 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- 239000002775 capsule Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 238000005566 electron beam evaporation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000013081 microcrystal Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 238000005477 sputtering target Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004988 Nematic liquid crystal Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910018956 Sn—In Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical group [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910021480 group 4 element Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- OFIYHXOOOISSDN-UHFFFAOYSA-N tellanylidenegallium Chemical compound [Te]=[Ga] OFIYHXOOOISSDN-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- 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
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- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28158—Making the insulator
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- H01L21/28202—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation in a nitrogen-containing ambient, e.g. nitride deposition, growth, oxynitridation, NH3 nitridation, N2O oxidation, thermal nitridation, RTN, plasma nitridation, RPN
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Abstract
【解決手段】基板1上に少なくとも、ソース電極3と、ドレイン電極4と、チャネル領域を含む半導体層2と、ゲート絶縁膜5と、ゲート電極6とを有する薄膜トランジスタであって、半導体層が、酸化物半導体層であり、ゲート絶縁膜が、少なくともOとNとを含むアモルファスシリコンであり、且つ酸化物半導体層の界面側で酸素濃度が高く、ゲート電極側に向かって酸素濃度が減少するように、ゲート絶縁膜が膜厚方向で酸素濃度の分布を持つ。
【選択図】図1
Description
前記半導体層が、酸化物半導体層であり、
前記ゲート絶縁膜が、少なくともOとNとを含むアモルファスシリコンであり、且つ前記酸化物半導体層の界面側で酸素濃度が高く、ゲート電極側に向かって酸素濃度が減少するように、前記ゲート絶縁膜が膜厚方向で酸素濃度の分布を持つことを特徴とする薄膜トランジスタである。
(ゲート絶縁膜に関して)
a-IGZO薄膜を大面積成膜が可能なスパッタ法を用いて形成し、チャネル層に用い、PECVD法によるアモルファスシリコンナイトライド(SiNx)をゲート絶縁層として図1の構成とすると以下の問題が発生する場合がある。即ちゲート電極に負電圧を印加しても、ソース端子とドレイン端子間に大きな電流が流れてしまい、TFT動作をしない(Idがオフしない)状態になる場合がある。
(酸化物半導体について)
300℃以下で形成されるZnOを主成分とする透明伝導性酸化物半導体多結晶薄膜、又は微結晶を含むZnOを主成分とする透明伝導性酸化物半導体薄膜を、PFCVD法によるSiNx絶縁膜上に積層した場合、次の問題が発生する場合がある。即ち熱酸化SiO2上に堆積した場合と比べて1〜3桁大きな電気導電率を示す場合があり、この場合TFTのオフ電流を小さくすることが難しい。上記透明伝導性酸化物半導体多結晶薄膜、もしくは透明伝導性酸化物半導体薄膜を、本実施形態によるアモルファスシリコンオキシナイトライド(a-SiOxNy)絶縁膜上に積層した。その結果、熱酸化SiO2上に堆積した場合と同等の電気伝導度が得られた。
さらに本実施形態のTFTでは、全ての構成体を透明にすることも可能であり、これにより、透明な表示素子を形成することもできる。また、軽量可撓で透明な樹脂製プラスチック基板など低耐熱性基体の上にも、かかる表示素子を設けることができる。
比較例として絶縁層の酸素濃度が一定のアモルファスシリコンオキシナイトライド(a-SiOxNy)を用いた、図1に示す逆スタガ(ボトムゲート)型MISFET素子を作製した。先ずガラス基板上にフォトリソグラフィー法とリフトオフ法を用い膜厚100nmのNiゲート端子を形成した。さらにその上に、酸窒化シリコンターゲットを用いたスパッタ法によりa-SiOxNyによる絶縁層を100nm形成した。その際、一定流量比のAr/O2の混合ガスを用いた。尚、a-SiOxNyの成膜方法はPECVD法などでも良い。そして、さらにその上に、室温においてスパッタ法でチャネル層として用いるアモルファス酸化物半導体膜を50nm形成した。フォトリソグラフィー法とドライエッチングを用いて半導体層と絶縁層のアイソレーションを行なった。最後にAu100nm/Ti5nmを電子ビーム蒸着法により成膜し、フォトリソグラフィー法とリフトオフ法によりソース、ドレイン端子を形成した。こうして、図1に示す逆スタガ(ボトムゲート)型MISFET素子を完成した。その際のアモルファス酸化物半導体膜の金属組成比はIn:Ga:Zn=1.00:0.94:0.65であった。このMISFET素子のI-V特性評価の結果、電界効果移動度7 cm2/Vs、オン・オフ比105超であった。
2 半導体層
3 ゲート絶縁膜
4 ゲート電極(ゲート端子)
5 ドレイン電極(ドレイン端子)
6 ソース電極(ソース端子)
Claims (7)
- 基板上に少なくとも、ソース電極と、ドレイン電極と、チャネル領域を含む半導体層と、ゲート絶縁膜と、ゲート電極とを有する薄膜トランジスタであって、
前記半導体層が、酸化物半導体層であり、
前記ゲート絶縁膜が、少なくともOとNとを含むアモルファスシリコンであり、且つ前記酸化物半導体層の界面側で酸素濃度が高く、ゲート電極側に向かって酸素濃度が減少するように、前記ゲート絶縁膜が膜厚方向で酸素濃度の分布を持つことを特徴とする薄膜トランジスタ。 - 前記半導体層が、Inと、Znと、Oとを含む酸化物半導体層であることを特徴とする請求項1に記載の薄膜トランジスタ。
- 前記半導体層が、さらにGa,Al,Fe,Sn,Mg,Ca,Si,Geのうちから選択される少なくとも1種を含み、
その抵抗値が1010Ω・cm未満であるアモルファス酸化物であることを特徴とする請求項2に記載の薄膜トランジスタ。 - 表示素子の電極に、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のソース又はドレイン電極が接続されている表示装置。
- 前記表示素子がエレクトロルミネッセンス素子である、請求項4に記載の表示装置。
- 前記表示素子が液晶セルである、請求項4に記載の表示装置。
- 基板上に前記表示素子及び前記薄膜トランジスタが二次元的に複数配されている請求項4から6のいずれか1項に記載の表示装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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JP2006074627A JP2007250982A (ja) | 2006-03-17 | 2006-03-17 | 酸化物半導体を用いた薄膜トランジスタ及び表示装置 |
KR1020087022667A KR101028722B1 (ko) | 2006-03-17 | 2007-02-23 | 박막 트랜지스터 및 표시장치 산화물 반도체 및 산소 농도 경사를 갖는 게이트 유전체 |
CN2007800092779A CN101405869B (zh) | 2006-03-17 | 2007-02-23 | 薄膜晶体管、显示器件氧化物半导体和具有氧浓度梯度的栅电介质 |
PCT/JP2007/053981 WO2007108293A1 (en) | 2006-03-17 | 2007-02-23 | Thin-film transistor and display device oxide semiconductor and gate dielectric having an oxygen concentration gradient |
EP07715131.4A EP1984953B1 (en) | 2006-03-17 | 2007-02-23 | Thin-film transistor and display device with oxide semiconductor and gate dielectric having an oxygen concentration gradient |
US12/281,783 US7923723B2 (en) | 2006-03-17 | 2007-02-23 | Thin-film transistor and display device using oxide semiconductor |
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US (1) | US7923723B2 (ja) |
EP (1) | EP1984953B1 (ja) |
JP (1) | JP2007250982A (ja) |
KR (1) | KR101028722B1 (ja) |
CN (1) | CN101405869B (ja) |
WO (1) | WO2007108293A1 (ja) |
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Also Published As
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KR20080103572A (ko) | 2008-11-27 |
CN101405869A (zh) | 2009-04-08 |
CN101405869B (zh) | 2011-03-23 |
KR101028722B1 (ko) | 2011-04-14 |
EP1984953B1 (en) | 2018-12-12 |
EP1984953A1 (en) | 2008-10-29 |
WO2007108293A1 (en) | 2007-09-27 |
US20090072232A1 (en) | 2009-03-19 |
US7923723B2 (en) | 2011-04-12 |
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