JP2009224797A - 半導体装置 - Google Patents
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- JP2009224797A JP2009224797A JP2009144175A JP2009144175A JP2009224797A JP 2009224797 A JP2009224797 A JP 2009224797A JP 2009144175 A JP2009144175 A JP 2009144175A JP 2009144175 A JP2009144175 A JP 2009144175A JP 2009224797 A JP2009224797 A JP 2009224797A
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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
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
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- H01L21/0445—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising crystalline silicon carbide
- H01L21/048—Making electrodes
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Abstract
【解決手段】(000−1)面の炭化珪素からなる半導体領域にゲート絶縁膜と、そのゲート絶縁膜上にゲート電極と、上記半導体領域に電極を有する半導体装置において、ゲート絶縁膜中に1E19/cm3から1E20/cm3の範囲の水素あるいは水酸基(OH)を含む。或いは、ゲート絶縁膜と半導体領域の界面に1E20/cm3から1E22/cm3の範囲の水素あるいは水酸基(OH)が存在する。
【選択図】図9
Description
例えば、特許文献1には、SiC単結晶基板の熱酸化膜の改善方法において、酸化する工程に続き、水素によりアニールする工程と、不活性ガスによりアニールする工程を有することを特徴とするヒステリシスおよびフラットバンドシフトを低減するSiCの熱酸化膜の改善法が開示されている。この公報には、特に、炭化珪素を酸化後に1000℃で水素熱処理する方法が記載されているが、これは、炭化珪素基板の(0001)面についての方法であり、(000−1)面については記載がない。さらに、1000℃では温度が高すぎて水素により酸化膜が還元されてしまい、この酸化膜をゲート酸化膜として用いた場合のデバイス信頼性を低下させる要因となる。
また、本発明の半導体装置は、(000−1)面の炭化珪素からなる半導体領域にゲート絶縁膜と、そのゲート絶縁膜上にゲート電極と、上記半導体領域に電極を有する半導体装置において、ゲート絶縁膜と半導体領域の界面に1E20/cm3から1E22/cm3の範囲の水素あるいは水酸基(OH)が存在することを特徴とする。
図1は、炭化珪素基板を用いたMOSトランジスタの製造プロセス途中の断面図である。図1(a)の(000−1)面のP型炭化珪素基板1(4H−SiC、不純物濃度:5×1015cm-3)を通常のRCA洗浄をした後に、P型炭化珪素基板1にフォトリソグラフィー用のアライメントマークをRIE(Reactive Ion Etching)で形成した。ここで、炭化珪素基板としては、シリコン基板上に成長した炭化珪素膜を用いることも可能である。
本実施例では、図1(b)に示すようにイオン注入マスクとして、LTO(Low Temperature Oxide)膜を用いた。LTO膜は、シランと酸素を400℃から800℃で反応させて二酸化珪素をP型炭化珪素基板1に堆積することにより形成した。次いで、フォトリソグラフィーでソース・ドレイン領域を形成した後に、HF(フッ酸)でLTOをエッチングしてイオン注入されるソース領域あるいはドレイン領域を開口した。次いで、図1(b)に示したソース3あるいはドレイン4を形成するために500℃で、窒素、燐あるいは砒素をイオン注入した。その後、アルゴン雰囲気中において1200℃から1700℃の範囲においで活性化熱処理を行う。本実施例では、1500℃で5分の熱処理を行った。次いで、基板の清浄化のために、1)犠牲酸化膜形成後HFでエッチング、2)オゾンに紫外光を照射しながらSiC基板表面処理、3)1000℃で30分のH2処理、4)2)の後に3)を連続して行う。次いで、800℃から1200℃でO2あるいは、H2O(水)を含むガスで酸化して、約50nmのゲート絶縁膜5を形成した。
この様にして得られた結果について、表1にゲート絶縁膜の形成条件と酸化後の熱処理条件とMOSFETのチャネル移動度の関係をまとめる。
ゲート酸化膜中に1E19/cm3以上の水素を含有している半導体装置のチャネル移動度は100cm2/Vs以上だが、1E20/cm3を超えると、水素によって酸化膜が還元されて酸化膜の耐圧が低下するので、1E19/cm3から1E20/cm3に限定される。
ゲート酸化膜と半導体領域の界面に1E21/cm3以上の水素を含有している半導体装置のチャネル移動度は100cm2/Vs以上だが、1E22/cm3を超えると、水素によって酸化膜が還元されて酸化膜の耐圧が低下するので、1E20/cm3から1E22/cm3に限定される。
図12に、横型(Lateral Resurf)MISFET回路の断面図を示す。
図13に、ゲート絶縁型バイポーラトランジスタ(IGBT:Insulator Gate Bipolar Transistor)回路の断面図を示す。n+型バッファ層はなくてもよい。
図14に、pチャネルIGBT回路の断面図を示す。p+型バッファ層はなくてもよい。
2 イオン注入用マスク
3 ソース
4 ドレイン
5 ゲート絶縁膜
6 ゲート電極
7 金属配線
Claims (18)
- (000−1)面の炭化珪素からなる半導体領域にゲート絶縁膜と、そのゲート絶縁膜上にゲート電極と、上記半導体領域に電極を有する半導体装置において、ゲート絶縁膜中に1E19/cm3から1E20/cm3の範囲の水素あるいは水酸基(OH)を含むことを特徴とする半導体装置。
- 請求項1に記載の半導体装置において、該半導体装置が金属―絶縁膜―半導体電界効果型トランジスタ(MIS FET)またはMIS キャパシタであることを特徴とする半導体装置。
- 請求項2に記載の半導体装置において、前記MIS FETがnチャネル型であることを特徴とする半導体装置。
- 請求項2に記載の半導体装置において、前記MIS FETがpチャネル型であることを特徴とする半導体装置。
- 請求項1に記載の半導体装置において、該半導体装置が請求項29及び請求項30に記載のMIS FETまたはMIS キャパシタから構成される相補型金属―絶縁膜―半導体(CMIS)を有する回路であることを特徴とする半導体装置。
- 請求項1に記載の半導体装置において、該半導体装置が横型金属―絶縁膜―半導体電界効果型トランジスタ(Lateral Resurf MIS FET)あるいは横型DMIS電界効果型トランジスタ(Lateral DMIS FET)であることを特徴とする半導体装置。
- 請求項1に記載の半導体装置において、該半導体装置が縦型DMIS FETであることを特徴とする半導体装置。
- 請求項1に記載の半導体装置において、該半導体装置が絶縁ゲート型バイポーラートランジスタ(IGBT)であることを特徴とする半導体装置。
- 請求項8に記載の半導体装置において、該半導体装置がpチャネル型IGBTであることを特徴とする半導体装置。
- (000−1)面の炭化珪素からなる半導体領域にゲート絶縁膜と、そのゲート絶縁膜上にゲート電極と、上記半導体領域に電極を有する半導体装置において、ゲート絶縁膜と半導体領域の界面に1E20/cm3から1E22/cm3の範囲の水素あるいは水酸基(OH)が存在することを特徴とする半導体装置。
- 請求項10に記載の半導体装置において、該半導体装置がMIS FETまたはMIS キャパシタであることを特徴とする半導体装置。
- 請求項11に記載の半導体装置において、前記MIS FETがnチャネル型であることを特徴とする半導体装置。
- 請求項11に記載の半導体装置において、前記MIS FETがpチャネル型であることを特徴とする半導体装置。
- 請求項10に記載の半導体装置において、該半導体装置がMIS FETまたはMIS キャパシタから構成されるCMISを有する回路であることを特徴とする半導体装置。
- 請求項10に記載の半導体装置において、該半導体装置が横型MIS FETあるいは横型DMIS FETであることを特徴とする半導体装置。
- 請求項10に記載の半導体装置において、該半導体装置が縦型DMIS FETであることを特徴とする半導体装置。
- 請求項10に記載の半導体装置において、該半導体装置がIGBTであることを特徴とする半導体装置。
- 請求項17に記載の半導体装置において、該半導体装置がpチャネル型IGBTであることを特徴とする半導体装置。
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DE10394372B4 (de) | 2011-07-28 |
WO2004003989A1 (ja) | 2004-01-08 |
DE10394374B4 (de) | 2013-02-21 |
AU2003280487A1 (en) | 2004-01-19 |
DE10392870B4 (de) | 2009-07-30 |
JPWO2004003989A1 (ja) | 2005-11-04 |
DE10392870T5 (de) | 2005-08-04 |
US20050245034A1 (en) | 2005-11-03 |
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