JP7061953B2 - 炭化珪素半導体装置および電力変換装置 - Google Patents
炭化珪素半導体装置および電力変換装置 Download PDFInfo
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- JP7061953B2 JP7061953B2 JP2018209347A JP2018209347A JP7061953B2 JP 7061953 B2 JP7061953 B2 JP 7061953B2 JP 2018209347 A JP2018209347 A JP 2018209347A JP 2018209347 A JP2018209347 A JP 2018209347A JP 7061953 B2 JP7061953 B2 JP 7061953B2
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- 239000004065 semiconductor Substances 0.000 title claims description 198
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 41
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 40
- 238000006243 chemical reaction Methods 0.000 title claims description 36
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- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 5
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- VLJQDHDVZJXNQL-UHFFFAOYSA-N 4-methyl-n-(oxomethylidene)benzenesulfonamide Chemical compound CC1=CC=C(S(=O)(=O)N=C=O)C=C1 VLJQDHDVZJXNQL-UHFFFAOYSA-N 0.000 description 2
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- 229910052759 nickel Inorganic materials 0.000 description 2
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- 229910021340 platinum monosilicide Inorganic materials 0.000 description 2
- 229910021332 silicide Inorganic materials 0.000 description 2
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 2
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- 238000010248 power generation Methods 0.000 description 1
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Description
(概要)
図1は、本実施の形態1におけるMOSFET91(炭化珪素半導体装置)の構成を概略的に示す部分断面図である。MOSFET91は、半導体基板10と、ドレイン電極30と、半導体層20と、ゲート絶縁膜41と、ゲート電極42と、ショットキー電極51と、ソースオーミック電極52と、抵抗体53と、ソース電極60とを有している。
MOSFET91(図1)の構成の詳細について、上記概要の記載と一部重複するところもあるが、以下に説明する。
なお、セル構造はメッシュ型に限定されるものではなく、例えばストライプ型であってもよい。図5は、メッシュ型に代わってストライプ型のセル構造を有する変形例の場合の、コンタクト領域C1Sにおける半導体層20(図1)の構成を概略的に示す上面図である。前述した本実施の形態においてはコンタクト領域C1(図1)が平面レイアウト(図2)において縦方向および横方向の各々において繰り返し配置される。変形例においては、コンタクト領域C1に代わるコンタクト領域C1Sが、平面レイアウト(図5)において、縦方向に延在しており、横方向において繰り返し配置される。本変形例によっても、上述した効果と同様の効果が得られる。
(概要)
図6は、本実施の形態2におけるMOSFET92(炭化珪素半導体装置)の構成を概略的に示す部分断面図である。図7は、コンタクト領域C2(図6)における半導体層20(図6)の構成を概略的に示す上面図である。MOSFET92は、半導体基板10と、ドレイン電極30と、半導体層20と、ゲート絶縁膜41と、ゲート電極42と、ショットキー電極51と、ソースオーミック電極52と、ソース電極60とを有している。
MOSFET92(図6)の構成の詳細について、上記概要の記載と一部重複するところもあるが、以下に説明する。
なお、セル構造はメッシュ型に限定されるものではなく、例えばストライプ型であってもよい。図8は、メッシュ型に代わってストライプ型のセル構造を有する変形例の場合の、コンタクト領域C2Sにおける半導体層20(図6)の構成を概略的に示す上面図である。前述した本実施の形態においてはコンタクト領域C2(図6)が平面レイアウト(図7)において縦方向および横方向の各々において繰り返し配置される。変形例においては、コンタクト領域C2に代わるコンタクト領域C2Sが、平面レイアウト(図8)において、縦方向に延在しており、横方向において繰り返し配置される。本変形例においては、図8に示されているように、半導体層20の上面において、ウェル領域22の縁は、縦方向(第1の方向)に沿う縁部を有している。ウェル領域22がウェルコンタクト領域24に接する部分と、ウェル領域22がソース領域23に接する部分とが、上記縁部に沿って繰り返されている。本変形例によっても、本実施の形態による効果と同様の効果が得られる。
本実施の形態3におけるMOSFET(炭化珪素半導体装置)は、コンタクト領域C2(図7:実施の形態2)のレイアウトとは異なるレイアウトを有するコンタクト領域を有している。これ以外の構成については、上述した実施の形態2(図6および図7)の構成とほぼ同じであるため、以下、本実施の形態におけるコンタクト領域の構成について説明する。
なお、セル構造はメッシュ型に限定されるものではなく、例えばストライプ型であってもよい。図10は、メッシュ型に代わってストライプ型のセル構造を有する変形例の場合の、コンタクト領域C3Sにおける半導体層20(図6)の構成を概略的に示す上面図である。前述した本実施の形態においてはコンタクト領域C2が平面レイアウト(図7)において縦方向および横方向の各々において繰り返し配置される。変形例においては、コンタクト領域C3に代わるコンタクト領域C3Sが、平面レイアウト(図10)において、縦方向に延在しており、横方向において繰り返し配置される。本変形例においては、図10に示されているように、半導体層20の上面において、ソース領域23の縁は、縦方向(第1の方向)に沿う縁部を有している。縁部に沿って、ソース領域23がウェルコンタクト領域24に接する部分と、ソース領域23がウェル領域22に接する部分とが繰り返されている。本変形例によっても、本実施の形態による効果と同様の効果が得られる。
本実施の形態は、上述した実施の形態1~3に係るMOSFET(炭化珪素半導体装置)を電力変換装置に適用したものである。実施の形態1~3に係るMOSFETの適用は特定の電力変換装置に限定されるものではないが、以下、実施の形態4として、三相のインバータに実施の形態1~3に係るMOSFETを適用した場合について説明する。
Claims (13)
- 炭化珪素半導体装置であって、
第1の基板面および前記第1の基板面と反対の第2の基板面を有し、第1の導電型を有する半導体基板と、
前記半導体基板の前記第1の基板面上に設けられたドレイン電極と、
前記半導体基板の前記第2の基板面上の第1の面と、前記第1の面と反対の第2の面とを有し、少なくとも部分的に炭化珪素から作られた半導体層と、
を備え、前記半導体層は、
前記半導体基板の前記第2の基板面上に設けられ、前記半導体層の前記第2の面を部分的に成し、前記第1の導電型を有するドリフト層と、
前記ドリフト層上に設けられ、前記半導体層の前記第2の面を部分的に成し、前記第1の導電型と異なる第2の導電型を有するウェル領域と、
前記ウェル領域上に設けられ、前記ウェル領域によって前記ドリフト層から隔てられ、前記半導体層の前記第2の面を部分的に成し、前記第1の導電型を有するソース領域と、
前記ウェル領域に接し、前記半導体層の前記第2の面を部分的に成し、前記第2の導電型を有し、前記ウェル領域の前記第2の面での不純物濃度に比して高い前記第2の面での不純物濃度を有するウェルコンタクト領域と、
を含み、前記炭化珪素半導体装置はさらに、
前記ソース領域と前記ドリフト層との間で前記ウェル領域を覆うゲート絶縁膜と、
前記ゲート絶縁膜上に設けられたゲート電極と、
前記ドリフト層に接するショットキー電極と、
前記半導体層の前記第2の面上において前記ソース領域に接するソースオーミック電極と、
前記半導体層の前記第2の面上において前記ウェルコンタクト領域に接し、前記ソースオーミック電極に比して高い単位面積当たりの抵抗を有する抵抗体と、
前記ショットキー電極と、前記ソースオーミック電極と、前記抵抗体との各々に電気的に接続されたソース電極と、
を備えた炭化珪素半導体装置。 - 前記抵抗体はポリシリコンから作られている、請求項1に記載の炭化珪素半導体装置。
- 前記ソース電極はアルミニウム原子を含有している、請求項2に記載の炭化珪素半導体装置。
- 前記ソースオーミック電極は前記ウェルコンタクト領域から離れている、請求項1から3のいずれか1項に記載の炭化珪素半導体装置。
- 炭化珪素半導体装置であって、
第1の基板面および前記第1の基板面と反対の第2の基板面を有し、第1の導電型を有する半導体基板と、
前記半導体基板の前記第1の基板面上に設けられたドレイン電極と、
前記半導体基板の前記第2の基板面上の第1の面と、前記第1の面と反対の第2の面とを有し、少なくとも部分的に炭化珪素から作られた半導体層と、
を備え、前記半導体層は、
前記半導体基板の前記第2の基板面上に設けられ、前記半導体層の前記第2の面を部分的に成し、前記第1の導電型を有するドリフト層と、
前記ドリフト層上に設けられ、前記半導体層の前記第2の面を部分的に成し、前記第1の導電型と異なる第2の導電型を有するウェル領域と、
前記ウェル領域上に設けられ、前記ウェル領域によって前記ドリフト層から隔てられ、前記半導体層の前記第2の面を部分的に成し、前記第1の導電型を有するソース領域と、
前記ウェル領域に接し、前記半導体層の前記第2の面を部分的に成し、前記第2の導電型を有し、前記ウェル領域の前記第2の面での不純物濃度に比して高い前記第2の面での不純物濃度を有するウェルコンタクト領域と、
を含み、前記半導体層の前記第2の面において前記ウェル領域の縁は、前記ウェルコンタクト領域に接する部分と、前記ソース領域に接する部分とを有しており、前記炭化珪素半導体装置はさらに、
前記ソース領域と前記ドリフト層との間で前記ウェル領域を覆うゲート絶縁膜と、
前記ゲート絶縁膜上に設けられたゲート電極と、
前記ドリフト層に接するショットキー電極と、
前記半導体層の前記第2の面上において少なくとも前記ソース領域に接するソースオーミック電極と、
前記ショットキー電極と、前記ソースオーミック電極との各々に電気的に接続されたソース電極と、
を備え、
前記ウェル領域は、前記ショットキー電極が接する前記ドリフト層側の縁と対向する側の縁において、前記ウェルコンタクト領域および前記ソース領域に接する部分を有している、炭化珪素半導体装置。 - 前記ソースオーミック電極は前記ウェルコンタクト領域に接している、請求項5に記載の炭化珪素半導体装置。
- 前記半導体層の前記第2の面において、前記ソース領域は、前記ウェルコンタクト領域を貫通して前記ウェル領域に達する突出部を有している、請求項5または6に記載の炭化珪素半導体装置。
- 前記半導体層の前記第2の面において、前記ウェル領域の縁は、第1の方向に沿う第1の縁部と、前記第1の方向と交差する第2の方向に沿う第2の縁部とを有しており、前記第1の縁部および前記第2の縁部の各々が、前記ウェルコンタクト領域に接する部分と、前記ソース領域に接する部分とを有している、請求項7に記載の炭化珪素半導体装置。
- 前記半導体層の前記第2の面において、前記ウェル領域の縁は、第1の方向に沿う縁部を有しており、前記ウェル領域が前記ウェルコンタクト領域に接する部分と、前記ウェル領域が前記ソース領域に接する部分とが、前記縁部に沿って繰り返されている、請求項7に記載の炭化珪素半導体装置。
- 前記半導体層の前記第2の面において、前記ウェル領域は、前記ウェルコンタクト領域を貫通して前記ソース領域に達する突出部を有している、請求項5または6に記載の炭化珪素半導体装置。
- 前記半導体層の前記第2の面において、前記ソース領域の縁は、第1の方向に沿う第1の縁部と、前記第1の方向と交差する第2の方向に沿う第2の縁部とを有しており、前記第1の縁部および前記第2の縁部の各々が、前記ウェルコンタクト領域に接する部分と、前記ウェル領域に接する部分とを有している、請求項10に記載の炭化珪素半導体装置。
- 前記半導体層の前記第2の面において、前記ソース領域の縁は、第1の方向に沿う縁部を有しており、前記縁部に沿って、前記ソース領域が前記ウェルコンタクト領域に接する部分と、前記ソース領域が前記ウェル領域に接する部分とが繰り返されている、請求項10に記載の炭化珪素半導体装置。
- 請求項1から12のいずれか1項に記載の炭化珪素半導体装置を有し、入力される電力を変換して出力する主変換回路と、
前記半導体装置を駆動する駆動信号を前記半導体装置に出力する駆動回路と、
前記駆動回路を制御する制御信号を前記駆動回路に出力する制御回路と、
を備えた電力変換装置。
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