JP2014029951A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- 239000013078 crystal Substances 0.000 claims abstract description 163
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 110
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 103
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- 230000003213 activating effect Effects 0.000 description 3
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- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000005137 deposition process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】半導体装置は、炭化珪素領域に設けられた第1トランジスタTr1と、第2トランジスタTr2を備える。炭化珪素領域は、第1結晶面100aと、第1結晶面の面方位とは異なる面方位の第2結晶面100bとを有する。第1トランジスタは、第1導電形の第1領域11、第1導電形の第2領域12及び第1領域と前記第2領域との間に設けられた第2導電形の第3領域13を有する。第2トランジスタは、第2導電形の第4領域21、第2導電形の第5領域22及び第4領域と前記第5領域との間に設けられた第1導電形の第6領域23を有する。第1領域、第2領域及び第3領域は、第1結晶面100aに沿って配置される。第4領域、第5領域及び第6領域は、第2結晶面100bに沿って配置される。
【選択図】図1
Description
このようなSiCを用いた半導体装置において、導電形の異なるトランジスタを混載した構成(例えば、CMOS(Complementary Metal Oxide Semiconductor))も考えられている。
SiCを用いた半導体装置では、更なるスイッチング特性の改善が重要である。
前記炭化珪素領域は、第1結晶面と、前記第1結晶面の面方位とは異なる面方位の第2結晶面と、を有する。
前記第1トランジスタは、第1導電形の第1領域、第1導電形の第2領域及び前記第1領域と前記第2領域との間に設けられた第2導電形の第3領域を有する。
前記第2トランジスタは、第2導電形の第4領域、第2導電形の第5領域及び前記第4領域と前記第5領域との間に設けられた第1導電形の第6領域を有する。
前記第1領域、前記第2領域及び前記第3領域は、前記第1結晶面に沿って配置される。
前記第4領域、前記第5領域及び前記第6領域は、前記第2結晶面に沿って配置される。
なお、図面は模式的または概念的なものであり、各部分の厚みと幅との関係、部分間の大きさの比率などは、必ずしも現実のものと同一とは限らない。また、同じ部分を表す場合であっても、図面により互いの寸法や比率が異なって表される場合もある。
また、本願明細書と各図において、既出の図に関して前述したものと同様の要素には同一の符号を付して詳細な説明は適宜省略する。
また、以下の説明において、導電形であるn形及びp形を示すn及びpの表記に付された+及び−の符号は、各導電形における不純物濃度の相対的な高低を表す。
また、以下の説明において、結晶面について例示する面方位には、その結晶面に対して8度以内の面を含むものとする。
図1(a)及び(b)は、第1の実施形態に係る半導体装置の構成を例示する模式図である。
図1(a)には、半導体装置110の模式的斜視図が表され、図1(b)には、トランジスタ領域の配置が模式的に表されている。なお、図1(a)に表された破線は、SiCウェーハ101の表面101aを削除(エッチング等)する前の状態を表している。
図1(a)に表したように、第1の実施形態に係る半導体装置110は、炭化珪素領域100に設けられた第1電界効果トランジスタ(第1トランジスタ)Tr1と、炭化珪素領域100に設けられた第2電界効果トランジスタ(第2トランジスタ)Tr2と、を備える。
図2は、ゲート電圧Vg[V]とキャリア移動度μFE[cm2/Vs]との関係を例示する図である。
図2では、4H-SiC基板の(0001)面(Si面)に沿って形成したnチャネル型MOSFET(以下、n−FET(Si)と言う。)、(000−1)面(C面)に沿って形成したnチャネル型MOSFET(以下、n−FET(C)と言う。)、(0001)面(Si面)に沿って形成したpチャネル型MOSFET(以下、p−FET(Si)と言う。)及び(000−1)面(C面)に沿って形成したpチャネル型MOSFET(以下、p−FET(C)と言う。)の、それぞれについて、キャリア移動度のゲート電圧依存性を示している。
また、n−FETを(000−1)面(C面)に沿って設け、p−FETを(0001)面(Si面)に沿って設けることによっても同様である。
図3(b)にはCMOSインバータの回路図が表され、図3(b)にはCMOSインバータを入出力特性が表されている。
図3(b)では、図3(a)に表した回路のCMOSインバータのn−FET及びp−FETを(0001)面(Si面)に沿って設けた参考例に係るCMOSインバータ190の入出力特性と、n−FETを(000−1)面(C面)に沿って設け、p−FETを(0001)面(Si面)に沿って設けたCMOSインバータ111の入出力特性と、が示されている。
図4(a)〜(c)は、半導体装置の製造方法を例示する模式図である。
なお、図4(a)〜(c)に表された破線は、SiCウェーハ101の表面101aを削除(エッチング等)する前の状態を表している。
先ず、図4(a)に表したように、SiCウェーハ101を用意する。SiCウェーハ101のSiCの結晶多形は4Hである。SiCウェーハ101の表面101aは(000−1)面である。
図5(a)には、半導体装置120の模式的斜視図が表され、図5(b)には、トランジスタ領域の配置が模式的に表されている。なお、図5(a)に表された破線は、SiCウェーハ101の表面101aを削除(エッチング等)する前の状態を表している。
図5(a)に表したように、第2の実施形態に係る半導体装置120は、第1の実施形態に係る半導体装置110と比べてSiCウェーハ101の表面101aの結晶面の方位が相違する。
図6(a)及び(b)は、第3の実施形態に係る半導体装置の構成を例示する模式図である。
図6(a)には、半導体装置130の模式的斜視図が表され、図6(b)には、トランジスタ領域の配置が模式的に表されている。なお、図6(a)に表された破線は、SiCウェーハ101の表面101aを削除(エッチング等)する前の状態を表している。
図6(a)に表したように、第2の実施形態に係る半導体装置130は、第1の実施形態に係る半導体装置110及び第2の実施形態に係る半導体装置120と比べてSiCウェーハ101の表面101aの結晶面の方位が相違する。
図7(a)〜(c)は、半導体装置の製造方法を例示する模式図である。
なお、図7(a)〜(c)に表された破線は、SiCウェーハ101の表面101aを削除(エッチング等)する前の状態を表している。先ず、図7(a)に表したように、SiCウェーハ101を用意する。SiCウェーハ101のSiCの結晶多形は4Hである。SiCウェーハ101の表面101aは(0001)面である。
図8は、第4の実施形態に係る半導体装置の構成を例示する模式的模式図である。
図9(a)及び(b)は、第4の実施形態に係る半導体装置を例示する模式的断面図である。
図9(a)には、図8に示すAA面での断面図が表され、図9(b)には、図8に示すBB面での断面図が表されている。
図8に表したように、第4の実施形態に係る半導体装置140は、第1の実施形態に係る半導体装置110と比べて第1結晶面100aと第2結晶面100bとが互いに平行する点で相違する。
先ず、図8に表したように、SiCウェーハ101を用意する。SiCウェーハ101のSiCの結晶多形は4Hである。SiCウェーハ101の表面101aは(11−20)面または(1−100)面である。SiCウェーハ101にはn形の不純物が導入されている。
Claims (13)
- 第1結晶面と、前記第1結晶面の面方位とは異なる面方位の第2結晶面と、を有する炭化珪素領域の前記第1結晶面に沿って配置された第1導電形の第1領域と、前記第1結晶面に沿って配置された第1導電形の第2領域と、前記第1領域と前記第2領域との間に設けられ前記第1結晶面に沿って配置された第2導電形の第3領域と、を有する第1トランジスタと、
前記炭化珪素領域の前記第2結晶面に沿って配置された第2導電形の第4領域と、前記第2結晶面に沿って配置された第2導電形の第5領域と、前記第4領域と前記第5領域との間に設けられ前記第2結晶面に沿って配置された第1導電形の第6領域と、を有する第2トランジスタと、
を備えた半導体装置。 - 前記第1結晶面は、前記第2結晶面と直交する請求項1記載の半導体装置。
- 前記第1結晶面は、(000−1)面である請求項1または2に記載の半導体装置。
- 前記第1導電形は、n形であり、
前記第2導電形は、p形である請求項3記載の半導体装置。 - 前記第1結晶面は、(0001)面である請求項1または2に記載の半導体装置。
- 前記第1導電形は、n形であり、
前記第2導電形は、p形である請求項5記載の半導体装置。 - 前記第1導電形は、p形であり、
前記第2導電形は、n形である請求項5記載の半導体装置。 - 前記第2結晶面は、(11−20)面である請求項1〜7のいずれか1つに記載の半導体装置。
- 前記第1結晶面は、前記第2結晶面と平行である請求項1記載の半導体装置。
- 前記第1結晶面は、(000−1)面であり、
前記第2結晶面は、(0001)面であり、
前記第1導電形は、n形であり、
前記第2導電形は、p形である請求項9記載の半導体装置。 - 前記第1トランジスタは、
前記第3領域の上に設けられた第1絶縁膜と、
前記第1絶縁膜の上に設けられた第1電極と、
を含み、
前記第2トランジスタは、
前記第6領域の上に設けられた第2絶縁膜と、
前記第2絶縁膜の上に設けられた第2電極と、
を含む請求項1〜10のいずれか1つに記載の半導体装置。 - 前記第2領域は、前記第5領域と導通する請求項1〜11のいずれか1つに記載の半導体装置。
- 前記炭化珪素領域の結晶多形は、4Hである請求項1〜12のいずれか1つに記載の半導体装置。
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US9601580B2 (en) | 2014-03-19 | 2017-03-21 | Kabushiki Kaisha Toshiba | Semiconductor device |
JP2019012780A (ja) * | 2017-06-30 | 2019-01-24 | 株式会社日立製作所 | 炭化ケイ素半導体装置およびその製造方法 |
WO2023210837A1 (ja) * | 2022-04-28 | 2023-11-02 | 国立研究開発法人産業技術総合研究所 | 半導体装置 |
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US10419197B2 (en) * | 2017-04-27 | 2019-09-17 | Qualcomm Incorporated | Sharing of long-term evolution (LTE) uplink spectrum |
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