JP6244763B2 - 炭化珪素半導体装置 - Google Patents
炭化珪素半導体装置 Download PDFInfo
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- JP6244763B2 JP6244763B2 JP2013189578A JP2013189578A JP6244763B2 JP 6244763 B2 JP6244763 B2 JP 6244763B2 JP 2013189578 A JP2013189578 A JP 2013189578A JP 2013189578 A JP2013189578 A JP 2013189578A JP 6244763 B2 JP6244763 B2 JP 6244763B2
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 116
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 115
- 239000004065 semiconductor Substances 0.000 title claims description 89
- 239000010410 layer Substances 0.000 claims description 122
- 210000000746 body region Anatomy 0.000 claims description 66
- 239000011229 interlayer Substances 0.000 claims description 34
- 239000012535 impurity Substances 0.000 description 18
- 230000004888 barrier function Effects 0.000 description 16
- 239000000758 substrate Substances 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- 238000005530 etching Methods 0.000 description 9
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- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000000969 carrier Substances 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 235000012239 silicon dioxide Nutrition 0.000 description 3
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
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- 230000005669 field effect Effects 0.000 description 2
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
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- 229910052801 chlorine Inorganic materials 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
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- 229910001873 dinitrogen Inorganic materials 0.000 description 1
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- 238000007429 general method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 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
- 238000005259 measurement Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- 229910052750 molybdenum Inorganic materials 0.000 description 1
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- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
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- 229910052709 silver Inorganic materials 0.000 description 1
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- 239000002356 single layer Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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Description
最初に本発明の実施形態を列記して説明する。
この構成によれば、複数の開口部よりも内側の領域と複数の開口部よりも外側の領域とが分断されることを防ぐことができる。
この構成によれば、炭化珪素半導体装置の製造しやすさを向上することができる。
以下、図面に基づいて本発明の実施の形態を説明する。なお、以下の図面において同一または相当する部分には同一の参照番号を付し、その説明は繰返さない。また、本明細書中の結晶学的記載においては、個別方位を[]、集合方位を<>、個別面を()、集合面を{}でそれぞれ示している。また、負の指数については、結晶学上、”−”(バー)を数字の上に付けることになっているが、本明細書中では、数字の前に負の符号を付けている。また角度の記載には、全方位角を360度とする系を用いている。
図1は、本発明の第1の実施の形態に係る炭化珪素半導体装置1の構成を概略的に示す平面図である。図2は、図1のII−II線に沿った断面図である。図1および図2を参照して、本発明の一実施形態に係る炭化珪素半導体装置1は、炭化珪素層10と、ゲート絶縁膜15と、ソース電極16と、ゲート電極27と、ショットキー電極25と、絶縁層70と、ゲートパッド電極59と、ゲートランナ66と、ソースパッド電極65と、ドレイン電極20と、裏面保護電極50とを有する。
図7は、本発明の第2の実施の形態に係る炭化珪素半導体装置1Aの構成を概略的に示す平面図である。図1および図7を参照して、炭化珪素半導体装置1Aの構成は、基本的には、第1の実施の形態に係る炭化珪素半導体装置1と同様である。ショットキー電極の配置の点において、第2の実施の形態に係る炭化珪素半導体装置1Aは、第1の実施の形態に係る炭化珪素半導体装置1と相違する。以下、この点について詳細に説明する。
図11は、本発明の第3の実施の形態に係る炭化珪素半導体装置1Bの構成を概略的に示す平面図である。図1および図11を参照して、炭化珪素半導体装置1Bの構成は、基本的には、第1の実施の形態に係る炭化珪素半導体装置1と同様である。SBDの断面形状の点において第3の実施の形態に係る炭化珪素半導体装置1Bは、第1の実施の形態に係る炭化珪素半導体装置1と相違する。以下、この点について詳細に説明する。
複数のショットキー電極25(言い換えると複数の開口部30a)は、平面視において、ゲート電極27よりも内側に位置するとともに、ゲートパッド電極59の中央部80を囲むように配置される。中央部80は、図示しないワイヤが接続されるゲートパッド電極59の領域である。
Claims (7)
- 炭化珪素半導体装置であって、
第1の主面と、前記第1の主面に対して反対側に位置する第2の主面とを有する炭化珪素層と、
前記第1の主面を覆うゲート絶縁膜とを備え、
前記炭化珪素層は、
第1の導電型を有し、前記炭化珪素層の前記第1の主面を規定するドリフト層と、
前記ドリフト層に設けられて、前記第1の導電型とは異なる第2の導電型を有するボディ領域とを含み、
前記ゲート絶縁膜には、前記第1の主面を露出させるための第1のコンタクトホールが形成され、前記ボディ領域には、トランジスタ素子が形成されず、かつ、前記第1のコンタクトホールに対応した位置に、前記ドリフト層を露出させる少なくとも1つの開口部が設けられ、
前記炭化珪素半導体装置は、
前記第1のコンタクトホールおよび前記開口部を通じて、前記ドリフト層にショットキー接合されたショットキー電極と、
前記ゲート絶縁膜上に配置されたゲート電極と、
前記ゲート絶縁膜、前記ゲート電極および前記ショットキー電極を覆うように配置されて、前記ゲート電極を露出させるための第2のコンタクトホールが形成された絶縁層と、
平面視において前記ショットキー電極と重なるように、前記絶縁層上に配置されて、前記第2のコンタクトホールを通じて前記ゲート電極と電気的に接続されたゲートパッド電極とを備える、炭化珪素半導体装置。 - 前記開口部は、前記第1のコンタクトホールの内側に配置され、
前記ショットキー電極は、前記ドリフト層と前記ボディ領域との両方にショットキー接合される、請求項1に記載の炭化珪素半導体装置。 - 前記炭化珪素層は、
前記ボディ領域に配置されて、前記第1の導電型を有する第1の領域と、
前記ボディ領域に配置されて、前記第2の導電型を有する第2の領域とをさらに含み、
前記絶縁層は、
前記ゲート絶縁膜および前記ゲート電極を覆うように配置されて、前記ショットキー電極を露出させるための第3のコンタクトホールと、前記第1および第2の領域を露出させるための第4のコンタクトホールとが形成された第1の層間絶縁膜と、
前記第1の層間絶縁膜の上に配置される第2の層間絶縁膜とを含み、
前記炭化珪素半導体装置は、
前記第1の層間絶縁膜上に配置されて、前記第3のコンタクトホールを通じて前記ショットキー電極と電気的に接続されるとともに、前記第4のコンタクトホールを通じて前記第1および第2の領域に電気的に接続されるソースパッド電極とをさらに備える、請求項1または請求項2に記載の炭化珪素半導体装置。 - 前記少なくとも1つの開口部は、間隔によって互いに分離された、複数の開口部であり、
前記ゲート電極は、前記ゲートパッド電極の外周部において前記ゲートパッド電極と電気的に接続され、
平面視において、前記複数の開口部は、前記ゲート電極よりも内側に位置するとともに、前記ゲートパッド電極の中央部を囲むように並べられる、請求項1から請求項3のいずれか1項に記載の炭化珪素半導体装置。 - 前記複数の開口部の間の前記間隔の長さは、一定である、請求項4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の主面と、前記第1の主面に対して反対側に位置する第2の主面とを有する炭化珪素層と、
前記第1の主面を覆うゲート絶縁膜とを備え、
前記炭化珪素層は、
第1の導電型を有し、前記炭化珪素層の前記第1の主面を規定するドリフト層と、
前記ドリフト層に設けられて、前記第1の導電型とは異なる第2の導電型を有するボディ領域とを含み、
前記ゲート絶縁膜には、前記第1の主面を露出させるための第1のコンタクトホールが形成され、前記ボディ領域には、トランジスタ素子が形成されず、かつ、前記第1のコンタクトホールに対応した位置に、前記ボディ領域を貫通して前記ドリフト層に達する溝を有する開口部が設けられ、
前記炭化珪素半導体装置は、
前記第1のコンタクトホールおよび前記開口部を通じて、前記ドリフト層にショットキー接合されたショットキー電極と、
前記ゲート絶縁膜上に配置されたゲート電極と、
前記ゲート絶縁膜、前記ゲート電極および前記ショットキー電極を覆うように配置されて、前記ゲート電極を露出させるための第2のコンタクトホールが形成された絶縁層と、
平面視において前記ショットキー電極と重なるように、前記絶縁層上に配置されて、前記第2のコンタクトホールを通じて前記ゲート電極と電気的に接続されたゲートパッド電極とを備える、炭化珪素半導体装置。 - 前記第1の導電型は、n型であり、
前記第2の導電型は、p型である、請求項1から請求項6のいずれか1項に記載の炭化珪素半導体装置。
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