JP5757223B2 - 炭化珪素半導体装置およびその製造方法 - Google Patents
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 64
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 64
- 239000004065 semiconductor Substances 0.000 title claims description 43
- 238000004519 manufacturing process Methods 0.000 title claims description 24
- 239000000758 substrate Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 30
- 238000005530 etching Methods 0.000 claims description 24
- 239000012535 impurity Substances 0.000 claims description 18
- 239000013078 crystal Substances 0.000 claims description 15
- 239000010410 layer Substances 0.000 description 18
- 239000007789 gas Substances 0.000 description 15
- 239000011229 interlayer Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 125000001309 chloro group Chemical group Cl* 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 125000005843 halogen group Chemical group 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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Description
図1に示すように、本実施の形態のスイッチング装置101(炭化珪素半導体装置)は、エピタキシャル基板SC(炭化珪素基板)と、ゲート絶縁膜20と、ゲート電極21と、層間絶縁膜30と、ソース電極31(第1の電極)と、ソース配線32と、ドレイン電極41(第2の電極)とを含む。
図5に示すように、スイッチング装置101はMOS部MSとJFET部JTとを有する。MOS部MSは、露出部13aがなす側壁面SLをチャネル面とするキャリアの流れをゲート電極21の電位によって制御可能なMOS構造である。JFET部JTは、充填部14Jbをチャネルとするキャリアの流れを埋込ゲート部13bの電位によって制御可能なJFET構造である。本実施の形態においては露出部13aと埋込ゲート部13bとの間の充填部14JaもJFET部JTのチャネルとして機能し得る。これらMOS部MSおよびJFET部JTは、図6に示すカスコード回路と等価な構造をなしている。これによりスイッチング装置101は、図5中の矢印に示すような電流の流れをゲート電極21の電位によって高速スイッチング可能であり、かつ低いオン抵抗を有する。
図7を参照して、n型の炭化珪素のエピタキシャル成長によって、n型の単結晶基板11の面PS上にドリフト層12が形成される。これにより、n型を有し、裏面P1と裏面P1と反対の面とを有する第1の領域10が準備される。次に第1の領域10の裏面P1と反対の面上に、p型の炭化珪素のエピタキシャル成長によって第2の領域13が形成される。炭化珪素のエピタキシャル成長は、たとえば化学気相成長(Chemical Vapor Deposition:CVD)によって行い得る。
図18を参照して、本実施の形態のスイッチング装置102(炭化珪素半導体装置)はエピタキシャル基板SCv(炭化珪素基板)を有する。エピタキシャル基板SCvにおいて、第3の領域14の接続部14Wは、充填部14Ja、14Jbの不純物濃度に比して大きい不純物濃度を有する低抵抗層16を含む。
Claims (8)
- 第1の面および前記第1の面と反対の第2の面を有する炭化珪素基板を有する炭化珪素半導体装置であって、
第1の導電型を有し、前記炭化珪素基板に含まれ、前記第1の面をなす第1の領域と、
前記第1の導電型と異なる第2の導電型を有し、前記炭化珪素基板に含まれ、前記第1の領域上に設けられた第2の領域とを備え、前記第2の領域は、前記第2の面をなす第1の部分と前記第2の面から離れている第2の部分とを含み、前記第2の領域には前記第1の領域を露出する複数の貫通孔が設けられており、さらに
前記第1の導電型を有し、前記炭化珪素基板に含まれ、前記第2の面において前記第2の領域の前記第1の部分と接する接触部と、前記第2の面をなし前記接触部から前記第2の領域の前記複数の貫通孔の各々へと延びる接続部と、前記第2の領域の前記複数の貫通孔の各々を充填する充填部とを含む第3の領域と、
前記第1の導電型を有し、前記炭化珪素基板に含まれ、前記第2の領域の前記第1の部分上に設けられ、前記第2の領域の前記第1の部分によって前記第1の領域および前記第3の領域の各々から隔てられ、前記第2の面をなす第4の領域と、
前記第2の領域の前記第1の部分のうち前記第3の領域の前記接触部と前記第4の領域との間の部分の上に設けられたゲート絶縁膜と、
前記ゲート絶縁膜上に設けられたゲート電極と、
前記ゲート電極と電気的に絶縁され、かつ前記第2の領域の前記第1の部分および前記第4の領域の各々に接する第1の電極と、
前記第1の領域がなす前記第1の面に接する第2の電極とを備える、炭化珪素半導体装置。 - 前記第1の領域は、前記第3の領域の不純物濃度に比して小さい不純物濃度を有するドリフト層を含む、請求項1に記載の炭化珪素半導体装置。
- 前記第1の領域は、前記第2の電極と接しかつ前記第3の領域の不純物濃度に比して大きい不純物濃度を有するベース層を含む、請求項1または2に記載の炭化珪素半導体装置。
- 前記第2の面は、前記第2の領域の前記前記第1の部分がなす側壁面を含む逆メサ形状を有する、請求項1〜3のいずれか1項に記載の炭化珪素半導体装置。
- 前記第1の部分がなす前記第2の面は、六方晶系の結晶構造における{0−33−8}面および{0−11−4}面のいずれか一方を含む、請求項1〜4のいずれか1項に記載の炭化珪素半導体装置。
- 前記第3の領域の前記接続部は、前記第3の領域の前記充填部の不純物濃度に比して大きい不純物濃度を有する低抵抗層を含む、請求項1〜5のいずれか1項に記載の炭化珪素半導体装置。
- 第1の導電型を有し、第1の面と前記第1の面と反対の面とを有する第1の領域を準備する工程と、
前記第1の領域の前記第1の面と反対の面上に、前記第1の導電型と異なる第2の導電型を有する第2の領域を形成する工程を備え、前記第2の領域は、第1の部分および第2の部分を含み、前記第2の領域には前記第1の領域を露出する複数の貫通孔が設けられており、さらに
前記第1の導電型を有し、前記複数の貫通孔の各々を充填するように前記第2の領域を覆う第3の領域を形成する工程と、
前記第2の領域の前記第2の部分が前記第3の領域によって覆われた状態が保たれつつ前記第2の領域の前記第1の部分が露出されるように、かつ前記第2の領域および前記第3の領域がなす表面が、前記第2の領域の前記第1の部分がなす側壁面を含む逆メサ形状をなすように、前記第2の領域および前記第3の領域を部分的にエッチングする工程と、
前記エッチングする工程の後に、前記第2の領域の前記第1の部分上に、前記第1の導電型を有し、前記第2の領域の前記第1の部分によって前記第1の領域および前記第3の領域の各々から隔てられた第4の領域を形成する工程と、
前記逆メサ形状の前記側壁面をなす前記第2の領域の前記第1の部分の上にゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜上にゲート電極を形成する工程と、
前記ゲート電極と電気的に絶縁され、かつ前記第2の領域の前記第1の部分および前記第4の領域の各々に接する第1の電極を形成する工程と、
前記第1の領域の前記第1の面上に第2の電極を形成する工程とを備える、炭化珪素半導体装置の製造方法。 - 前記エッチングする工程は熱エッチングによって行われる、請求項7に記載の炭化珪素半導体装置の製造方法。
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Application Number | Priority Date | Filing Date | Title |
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JP2011264332A JP5757223B2 (ja) | 2011-12-02 | 2011-12-02 | 炭化珪素半導体装置およびその製造方法 |
PCT/JP2012/076299 WO2013080679A1 (ja) | 2011-12-02 | 2012-10-11 | 炭化珪素半導体装置およびその製造方法 |
CN201280053367.9A CN103907193A (zh) | 2011-12-02 | 2012-10-11 | 碳化硅半导体器件及其制造方法 |
US13/667,850 US20130140583A1 (en) | 2011-12-02 | 2012-11-02 | Silicon carbide semiconductor device and method for manufacturing the same |
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JP4029595B2 (ja) * | 2001-10-15 | 2008-01-09 | 株式会社デンソー | SiC半導体装置の製造方法 |
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