JP6206096B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP6206096B2 JP6206096B2 JP2013227148A JP2013227148A JP6206096B2 JP 6206096 B2 JP6206096 B2 JP 6206096B2 JP 2013227148 A JP2013227148 A JP 2013227148A JP 2013227148 A JP2013227148 A JP 2013227148A JP 6206096 B2 JP6206096 B2 JP 6206096B2
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- Prior art keywords
- insulating film
- opening
- film
- semiconductor device
- layer
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- 239000004065 semiconductor Substances 0.000 title claims description 112
- 238000004519 manufacturing process Methods 0.000 title claims description 35
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- 229910008284 Si—F Inorganic materials 0.000 description 25
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- FFQCSDOYDVGJLQ-UHFFFAOYSA-N [diacetyloxy(3-aminopropyl)silyl] acetate Chemical compound CC(=O)O[Si](OC(C)=O)(OC(C)=O)CCCN FFQCSDOYDVGJLQ-UHFFFAOYSA-N 0.000 description 2
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Classifications
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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
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- H01L29/7787—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with direct single heterostructure, i.e. with wide bandgap layer formed on top of active layer, e.g. direct single heterostructure MIS-like HEMT with wide bandgap charge-carrier supplying layer, e.g. direct single heterostructure MODFET
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Description
(半導体装置の製造方法)
本実施の形態における半導体装置の製造方法について、図3から図10に基づき説明する。
Si−F + H2O → Si−OH +HF・・・・・(1)
即ち、(1)に示されるように、Si−Fが加水分解されると、Si−OHとHFとが生成され、図6に示すように、開口部40aの側面に付着していたSi−Fは略消滅し、Si−OHが多く存在している状態となる。このことは、開口部40bの側面においても同様である。尚、この加水分解は、200℃以上の水蒸気であれば、滞りなく進行する反応であるが、200℃未満の温度では、加水分解が進行しないか、又は、進行が極めて遅いため、好ましくない。また、あまり高温、例えば、600℃を超える水蒸気を用いると、窒化物半導体や電極等に悪影響を与える場合があるため好ましくない。よって、本実施の形態においては、水蒸気処理に用いられる水蒸気は、200℃以上、600℃以下の水蒸気が好ましい。
次に、本実施の形態における半導体装置において形成される疎水膜について説明する。図11は、層間絶縁膜42に形成されている開口部40a、40b、40cにおける水の接触角を調べた結果である。具体的には、水を滴下させた状態を示す写真である。
次に、第2の実施の形態における半導体装置の製造方法について、図14から図17に基づき説明する。
Si−F + H2O → Si−OH +HF・・・・・(1)
即ち、(1)に示されるように、Si−Fが加水分解されると、Si−OHとHFが生成され、図6に示すように、開口部40aの側面に付着していたSi−Fは略消滅し、Si−OHが多く存在している状態となる。このことは、開口部40bの側面においても同様である。尚、この加水分解は、200℃以上の水蒸気であれば、滞りなく進行する反応であるが、200℃未満の温度では、加水分解が進行しないか、又は、進行が極めて遅いため、好ましくない。また、あまり高温、例えば、600℃を超える水蒸気を用いると、窒化物半導体や電極等に悪影響を与える場合があるため好ましくない。よって、本実施の形態においては、水蒸気処理に用いられる水蒸気は、200℃以上、600℃以下の水蒸気が好ましい。
(付記1)
半導体層が形成されている基板の上に絶縁膜を形成する工程と、
前記絶縁膜の一部をエッチングにより除去することにより、コンタクトホールとなる開口部を形成する工程と、
前記開口部の形成されている絶縁膜に、200℃以上、600°以下の水蒸気を供給する工程と、
前記水蒸気を供給した後、前記開口部の形成されている前記絶縁膜の表面に、シリコン化合物を含む溶液を塗布する工程と、
前記絶縁膜の前記開口部の側面において、前記シリコン化合物を重合させて疎水膜を形成する工程と、
前記コンタクトホールとなる開口部に、金属材料を埋め込むことにより貫通電極を形成する工程と、
を有することを特徴とする半導体装置の製造方法。
(付記2)
前記絶縁膜を形成する工程、前記開口部を形成する工程、前記水蒸気を供給する工程、前記シリコン化合物を含む溶液を塗布する工程、前記疎水膜を形成する工程、前記貫通電極を形成する工程を繰り返し行なうことにより、多層配線構造を形成することを特徴とする付記1に記載の半導体装置の製造方法。
(付記3)
半導体層が形成されている基板の上に絶縁膜を形成する工程と、
前記絶縁膜の一部をエッチングにより除去することにより、開口部を形成する工程と、
前記開口部の形成されている絶縁膜に、200℃以上、600°以下の水蒸気を供給する工程と、
前記水蒸気を供給した後、前記開口部の形成されている前記絶縁膜の表面に、シリコン化合物を含む溶液を塗布する工程と、
前記絶縁膜の前記開口部の側面において、前記シリコン化合物を重合させて疎水膜を形成する工程と、
を有することを特徴とする半導体装置の製造方法。
(付記4)
前記開口部は、スクライブラインとなるものであることを特徴とする付記3に記載の半導体装置の製造方法。
(付記5)
前記疎水膜は、前記シリコン化合物に紫外線を照射することにより形成された重合膜であることを特徴とする付記1から4のいずれかに記載の半導体装置の製造方法。
(付記6)
前記シリコン化合物を含む溶液は、化1に示されるシリコン化合物を含む溶液であって、
(付記7)
前記シリコン化合物を含む溶液は、化2に示されるシリコン化合物を含む溶液であって、
(付記8)
前記絶縁膜はシリカを含む溶液を塗布し、乾燥させることにより形成された多孔質シリカを含むものであることを特徴とする付記1から7のいずれかに記載の半導体装置の製造方法。
(付記9)
前記エッチングは、ドライエッチングであることを特徴とする付記1から8のいずれかに記載の半導体装置の製造方法。
(付記10)
前記半導体層は、窒化物半導体であることを特徴とする付記1から9のいずれかに記載の半導体装置の製造方法。
(付記11)
前記半導体層は、前記基板の上に第1の半導体層と第2の半導体層を順次積層することにより形成されたものであって、
前記第1の半導体層は、GaNを含む材料により形成されており、
前記第2の半導体層は、AlGaNを含む材料により形成されていることを特徴とする付記1から10のいずれかに記載の半導体装置の製造方法。
(付記12)
基板の上に形成されている半導体層と、
前記基板又は前記半導体層の上に形成されている絶縁膜と、
前記絶縁膜に形成されているコンタクトホールとなる開口部と、
前記絶縁膜の開口部の側面に形成されている疎水膜と、
前記開口部に形成された貫通電極と、
を有し、
前記疎水膜は、水に対する接触角が、90°以上であることを特徴とする半導体装置。
(付記13)
前記絶縁膜は、複数層積層して形成されていることを特徴とする付記12に記載の半導体装置。
(付記14)
基板の上に形成されている半導体層と、
前記基板又は前記半導体層の上に形成されている絶縁膜と、
前記絶縁膜に形成されている開口部と、
前記絶縁膜の開口部の側面に形成されている疎水膜と、
を有し、
前記疎水膜は、水に対する接触角が、90°以上であることを特徴とする半導体装置。
(付記15)
前記開口部は、スクライブラインとなるものであることを特徴とする付記14に記載の半導体装置。
(付記16)
前記疎水膜は、SiC又はSiNを含む重合膜であることを特徴とする付記12から15のいずれかに記載の半導体装置。
(付記17)
前記絶縁膜は、多孔質シリカを含むものにより形成されていることを特徴とする付記12から16のいずれかに記載の半導体装置。
11 素子分離領域
21 電子走行層(第1の半導体層)
22 電子供給層(第2の半導体層)
31 ゲート電極
32 ソース電極
33 ドレイン電極
40a 開口部(コンタクトホール)
40b 開口部(コンタクトホール)
40c 開口部(スクライブライン)
41 下部絶縁膜
42 層間絶縁膜
43 上部絶縁膜
44 疎水膜
45 疎水膜
50a 貫通電極
50b 貫通電極
51 抵抗膜
52 電極層
53 電極層
54 第1のメッキ層
55 貫通電極
56 第2のメッキ層
Claims (4)
- 半導体層が形成されている基板の上に絶縁膜を形成する工程と、
前記絶縁膜の一部をエッチングにより除去することにより、開口部を形成する工程と、
前記開口部の形成されている絶縁膜に、200℃以上、600°以下の水蒸気を供給する工程と、
前記水蒸気を供給した後、前記開口部の形成されている前記絶縁膜の表面に、シリコン化合物を含む溶液を塗布する工程と、
前記絶縁膜の前記開口部の側面において、前記シリコン化合物を重合させて疎水膜を形成する工程と、
を有し、
前記開口部は、スクライブラインとなるものであることを特徴とする半導体装置の製造方法。 - 前記疎水膜は、前記シリコン化合物に紫外線を照射することにより形成された重合膜であることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記シリコン化合物を含む溶液は、化2に示されるシリコン化合物を含む溶液であって、
- 前記半導体層は、窒化物半導体であることを特徴とする請求項1から3のいずれかに記載の半導体装置の製造方法。
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US14/513,607 US9660065B2 (en) | 2013-10-31 | 2014-10-14 | Semiconductor device and method for producing same having multilayer wiring structure with contact hole having hydrophobic film formed on side surface of the contact hole |
US15/486,748 US9966463B2 (en) | 2013-10-31 | 2017-04-13 | Semiconductor device and method for producing same having multilayer wiring structure with contact hole having hydrophobic film formed on side surface of the contact hole |
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