JP5095864B2 - 半導体装置およびその製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims description 221
- 238000004519 manufacturing process Methods 0.000 title claims description 30
- 239000010408 film Substances 0.000 claims description 585
- 239000010410 layer Substances 0.000 claims description 167
- 230000001681 protective effect Effects 0.000 claims description 149
- 239000000758 substrate Substances 0.000 claims description 85
- 238000005530 etching Methods 0.000 claims description 84
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 64
- 230000015572 biosynthetic process Effects 0.000 claims description 55
- 238000000034 method Methods 0.000 claims description 49
- 229910004205 SiNX Inorganic materials 0.000 claims description 40
- 239000003990 capacitor Substances 0.000 claims description 28
- 239000010409 thin film Substances 0.000 claims description 20
- 238000000059 patterning Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 9
- 239000011241 protective layer Substances 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 14
- 229910052760 oxygen Inorganic materials 0.000 description 14
- 238000007796 conventional method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 238000000206 photolithography Methods 0.000 description 9
- 239000004973 liquid crystal related substance Substances 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002356 single layer Substances 0.000 description 7
- 239000011229 interlayer Substances 0.000 description 6
- 238000005229 chemical vapour deposition Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 5
- 238000001039 wet etching Methods 0.000 description 5
- 229910007541 Zn O Inorganic materials 0.000 description 4
- 238000001312 dry etching Methods 0.000 description 4
- 238000005401 electroluminescence Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910003077 Ti−O Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 235000015067 sauces Nutrition 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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Description
以下、図面を参照しながら、本発明による実施形態1の半導体装置の製造方法を説明する。
以下、図面を参照しながら、本発明による実施形態2の半導体装置の製造方法を説明する。本実施形態は、補助容量電極として、ドレイン電極の代わりに画素電極を用いる点で、実施形態1と異なっている。
以下、図面を参照しながら、本発明による実施形態3の半導体装置の製造方法を説明する。本実施形態は、保護膜と画素電極との間に有機絶縁膜を形成する点で、前述の実施形態と異なっている。
以下、図面を参照しながら、本発明による実施形態4の半導体装置の製造方法を説明する。本実施形態は、ゲート絶縁膜として、SiNx膜を下層とし、SiO2膜を上層とする積層膜を形成し、保護膜として、SiO2膜を下層とし、SiNx膜を上層とする積層膜を形成する点で、前述の実施形態と異なっている。
3a ゲート配線
3b 補助容量配線
3c 接続部
3d 接続部
5 絶縁膜(ゲート絶縁膜)
5L ゲート絶縁膜の下層
5U ゲート絶縁膜の上層
7a、7b 酸化物半導体層(活性層)
9 絶縁膜(保護膜、エッチストッパ)
11as、11ad、11b、11c、11d、17b、17c、27a、27b、27c、37a、37b、37c 開口部
13as、23as ソース配線
13ad、23ad ドレイン電極
13c、23c、19c、29c 接続部
15、25 保護膜
19、29 画素電極
36 有機絶縁膜
25L 保護膜の下層
25U 保護膜の上層
101、201 表示領域における1個の画素部
102、202 端子配置領域
Claims (18)
- 基板と、前記基板上に形成された薄膜トランジスタと、前記薄膜トランジスタと外部配線とを電気的に接続する端子部とを備え、
前記薄膜トランジスタは、
前記基板上に設けられたゲート配線と、
前記ゲート配線上に形成された第1絶縁膜と、
前記第1絶縁膜上に形成され、チャネル領域と、前記チャネル領域の両側にそれぞれ位置するソース領域およびドレイン領域とを有する島状の酸化物半導体層と、
前記酸化物半導体層上に接して設けられた第2絶縁膜と、
前記第2絶縁膜上に設けられ、前記ソース領域と電気的に接続されたソース配線と、
前記第2絶縁膜上に設けられ、前記ドレイン領域と電気的に接続されたドレイン電極と、
前記ソース配線およびドレイン電極上に設けられ、前記薄膜トランジスタを覆う保護膜と
を備え、
前記端子部は、
前記ゲート配線と同一の導電膜から形成された第1接続部と、
前記第1接続部上に形成され、前記ソース配線およびドレイン電極と同一の導電膜から形成された第2接続部と、
前記第2接続部上に形成された第3接続部と
を備え、
前記第2接続部は、前記第1絶縁膜および前記第2絶縁膜に設けられた第1開口部内で、前記第1接続部と接しており、
前記第3接続部は、前記保護膜に設けられた第2開口部内で、前記第2接続部と接しており、
前記第2接続部は、前記第1開口部における前記第1絶縁膜および前記第2絶縁膜の端面を覆い、かつ、前記第2開口部における前記保護膜の端面を覆っておらず、前記第2接続部の一部は前記第2絶縁膜と前記保護膜との間に配置されている半導体装置の製造方法であって、
(A)基板上にゲート配線用導電膜を形成し、これをパターニングすることによって、ゲート配線および第1接続部を形成する工程と、
(B)前記ゲート配線および前記第1接続部上に、第1絶縁膜を形成する工程と、
(C)前記第1絶縁膜上に、薄膜トランジスタの活性層となる酸化物半導体層を形成する工程と、
(D)前記酸化物半導体層および前記第1絶縁膜を覆う第2絶縁膜を形成する工程と、
(E)前記第1および第2絶縁膜のエッチングを行う工程であって、前記第2絶縁膜に、前記酸化物半導体層をエッチストップとして、前記酸化物半導体層を露出するソースコンタクト形成用開口部およびドレインコンタクト形成用開口部を形成するとともに、前記第2絶縁膜および前記第1絶縁膜に、前記第1接続部の表面を露出する第1開口部を形成する工程と、
(F)前記第2絶縁膜上にソース・ドレイン電極用導電膜を形成し、これをパターニングすることによって、前記ソースコンタクト形成用開口部内で前記酸化物半導体層に接するソース配線と、前記ドレインコンタクト形成用開口部内で前記酸化物半導体層に接するドレイン電極と、前記第1開口部内で前記第1接続部に接する第2接続部を形成する工程と、
(G)前記ソース配線、前記ドレイン電極および前記第2接続部上に保護膜を形成する工程と、
(H)前記保護膜に、前記第2接続部を露出する第2開口部を形成する工程と、
(I)前記保護膜上に、前記第2開口部内で前記第2接続部に接する第3接続部を形成する工程と
を包含する半導体装置の製造方法。 - 前記工程(H)は、前記保護膜に、前記ドレイン電極を露出する開口部を形成する工程を含み、
前記工程(I)は、前記保護膜上に透明導電膜を形成し、これをパターニングすることによって、前記第3接続部と画素電極とを形成する工程であって、前記画素電極は、前記ドレイン電極を露出する前記開口部内で前記ドレイン電極と接する工程である請求項1に記載の半導体装置の製造方法。 - 請求項1または2に記載された製造方法により製造された半導体装置。
- 前記基板の表面の法線方向から見て、前記第2開口部は、前記第1開口部の内部に位置する請求項3に記載の半導体装置。
- 前記ドレイン電極と電気的に接続された画素電極をさらに備え、
前記第3接続部は、前記画素電極と同一の導電膜から形成されている請求項3または4に記載の半導体装置。 - 前記基板に形成された補助容量をさらに備え、
前記補助容量は、
前記ゲート配線と同一の導電膜から形成された補助容量配線と、
前記補助容量配線を覆う前記第1絶縁膜と、
前記酸化物半導体層と同一の酸化物半導体膜から形成された補助容量形成用半導体層と、
前記補助容量形成用半導体層上に設けられた補助容量電極と
を有しており、
前記補助容量電極は、前記第2絶縁膜に形成された開口部内で前記補助容量形成用半導体層と接している請求項5に記載の半導体装置。 - 前記補助容量電極は、前記ドレイン電極の一部であり、
前記画素電極は、前記保護膜に形成された開口部内で前記補助容量電極に接している請求項6に記載の半導体装置。 - 前記補助容量電極は、前記画素電極の一部である請求項6に記載の半導体装置。
- 前記ゲート配線と前記ソース配線とを電気的に接続するゲート・ソース接続部をさらに備え、
前記ゲート・ソース接続部では、前記ソース配線は、前記第1絶縁膜および前記第2絶縁膜に設けられた前記第1開口部内で前記ゲート配線に接している請求項3から8のいずれかに記載の半導体装置。 - 前記保護膜と前記画素電極との間に、有機絶縁膜をさらに備える請求項3から9のいずれかに記載の半導体装置。
- 前記第1絶縁膜および前記保護膜のうち少なくとも一方はSiO2を含む請求項3から10のいずれかに記載の半導体装置。
- 前記第1絶縁膜は、SiO2膜およびSiNx膜を含む積層構造を有しており、前記SiO2膜は前記積層構造の最上層であり、前記酸化物半導体層の下面と接している請求項11に記載の半導体装置。
- 前記保護膜は、SiO2膜およびSiNx膜を含む積層構造を有しており、前記SiO2膜は前記積層構造の最下層である請求項11または12に記載の半導体装置。
- 前記ゲート配線の上面および側壁と前記ソース配線との間、および、前記ゲート配線の上面および側壁と前記ドレイン電極との間には、少なくとも前記第1絶縁膜および前記酸化物半導体層が設けられている請求項3から13のいずれかに記載の半導体装置。
- 前記ゲート配線の上面および側壁と前記ソース配線との間、および、前記ゲート配線の上面および側壁と前記ドレイン電極との間に、前記第2絶縁膜がさらに設けられている請求項14に記載の半導体装置。
- 前記第2絶縁膜は、前記酸化物半導体層の表面のうち前記ソース領域および前記ドレイン領域を除く全ての上面および側壁を覆っており、かつ、前記酸化物半導体層の側壁近傍で前記第1絶縁膜の上面と接している請求項3から15のいずれかに記載の半導体装置。
- 前記酸化物半導体層のチャネル長方向に沿った幅は、前記ゲート配線のチャネル長方向に沿った幅よりも大きい請求項3から16のいずれかに記載の半導体装置。
- 前記開口部の周縁において、前記第2接続部と前記第3接続部との間に前記保護膜が存在する請求項3から17のいずれかに記載の半導体装置。
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EP2511896B1 (en) | 2019-05-08 |
KR20120089773A (ko) | 2012-08-13 |
EP2511896A1 (en) | 2012-10-17 |
JP2013051421A (ja) | 2013-03-14 |
RU2503085C1 (ru) | 2013-12-27 |
JPWO2011070981A1 (ja) | 2013-04-22 |
CN102652330A (zh) | 2012-08-29 |
BR112012013851A2 (pt) | 2019-09-24 |
KR101273831B1 (ko) | 2013-06-11 |
US8685803B2 (en) | 2014-04-01 |
WO2011070981A1 (ja) | 2011-06-16 |
CN102652330B (zh) | 2014-09-17 |
EP2511896A4 (en) | 2016-08-31 |
JP5518966B2 (ja) | 2014-06-11 |
US20120241750A1 (en) | 2012-09-27 |
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