JP6690198B2 - 炭化珪素半導体装置の製造方法 - Google Patents
炭化珪素半導体装置の製造方法 Download PDFInfo
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- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 224
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 212
- 239000004065 semiconductor Substances 0.000 title claims description 177
- 238000004519 manufacturing process Methods 0.000 title claims description 26
- 238000000034 method Methods 0.000 title claims description 26
- 239000000758 substrate Substances 0.000 claims description 63
- 239000012535 impurity Substances 0.000 claims description 53
- 230000006798 recombination Effects 0.000 claims description 39
- 230000007547 defect Effects 0.000 claims description 26
- 238000010894 electron beam technology Methods 0.000 claims description 16
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 174
- 238000005215 recombination Methods 0.000 description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- 229910052710 silicon Inorganic materials 0.000 description 12
- 239000010703 silicon Substances 0.000 description 12
- 230000001939 inductive effect Effects 0.000 description 9
- 229910004298 SiO 2 Inorganic materials 0.000 description 8
- 239000013078 crystal Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 239000011229 interlayer Substances 0.000 description 7
- 238000005468 ion implantation Methods 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000002344 surface layer Substances 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 5
- 238000003763 carbonization Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 230000005669 field effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 238000007429 general method Methods 0.000 description 2
- 230000001976 improved effect Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229910003465 moissanite Inorganic materials 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- ZOCHARZZJNPSEU-UHFFFAOYSA-N diboron Chemical compound B#B ZOCHARZZJNPSEU-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L21/0445—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising crystalline silicon carbide
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- H01L21/0455—Making n or p doped regions or layers, e.g. using diffusion
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
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- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
Description
実施の形態1にかかる半導体装置の構造について、プレーナゲート型MOSFETを例に説明する。図1Aは、実施の形態1にかかる半導体装置のボディーダイオードの順方向通電時の状態を示す断面図である。図1Bは、図1Aの半導体と絶縁膜との界面のバンド構造を示す特性図である。図1Aには、ドレイン電極11に対して正の電圧Vsdをソース電極9に印加し、p型ベース領域3とドリフト領域(n-型ドリフト層2)との間のpn接合12を順方向にバイアスしてボディーダイオード13の順方向通電時で、かつゲート電極7を負バイアス(ゲート電圧Vgs<0V)とした状態を示す。図1Bには、n-型ドリフト層2および第2p型ベース領域3bを構成する4H−SiC(炭化珪素の四層周期六方晶)と、ゲート絶縁膜6を構成する二酸化珪素(SiO2)と、の界面10aに形成されるエネルギー帯のバンド構造を示す。
次に、実施の形態2にかかる半導体装置の構造について説明する。図2は、実施の形態2にかかる半導体装置のボディーダイオードの順方向通電時の状態を示す断面図である。実施の形態2にかかる半導体装置が実施の形態1にかかる半導体装置と異なる点は、第1p+型ベース領域(p型ベース領域3のドレイン側の部分)33aを第2p型ベース領域(p型ベース領域3のソース側の部分)33bよりも、基体おもて面に平行な方向に、n-型ドリフト層2の、隣り合うp型ベース領域3間に挟まれた部分2a内に突出させた点である。すなわち、ゲート電極7の直下(ドレイン側)において、隣り合う第1p+型ベース領域33a間の幅(チャネル長Lと同方向の幅)w1は、隣り合う第2p型ベース領域33bの間の幅w2よりも狭い(w1<w2)。
次に、実施の形態3にかかる半導体装置の構造について説明する。図3は、実施の形態3にかかる半導体装置のボディーダイオードの順方向通電時の状態を示す断面図である。実施の形態3にかかる半導体装置は、実施の形態1にかかる半導体装置をトレンチゲート型MOSFETに適用した構成を備える。すなわち、図3に示す実施の形態3にかかる炭化珪素半導体装置は、炭化珪素基体(半導体チップ)10のおもて面(Si面)側にトレンチゲート型のMOSゲート構造を備えたSiC−MOSFETである。
2 n-型ドリフト層
2a n-型ドリフト層の、隣り合うp型ベース領域間に挟まれた部分
3 p型ベース領域
3a,3b,33a,33b,43 p型ベース領域
4,44 n+型ソース領域
5,45 p+型コンタクト領域
6,46 ゲート絶縁膜
7,47 ゲート電極
8,48 層間絶縁膜
9,49 ソース電極
10 炭化珪素基体
11 ドレイン電極
12 p型ベース領域とドリフト領域との間のpn接合
13 ボディーダイオード
21 電子
22 ホール
23 ホールの蓄積層
51 トレンチ
51a トレンチの底面
51b トレンチの側壁
EC0,EV0 炭化珪素の元々のエネルギー準位
EC1,EV1 炭化珪素の実効的なのエネルギー準位
Eg0 炭化珪素の元々のバンドギャップ
Eg1 炭化珪素の見かけ上のバンドギャップ
If 順方向電流
L チャネル長
hν 光子の発光エネルギー
w1,w2 隣り合うp型ベース領域間の幅
ΔEV0 炭化珪素/絶縁膜界面の価電子帯バンドオフセット
Claims (8)
- 炭化珪素からなる第1導電型の半導体基板のおもて面に、前記半導体基板よりも不純物濃度の低い炭化珪素からなる第1導電型の半導体層を形成する第1工程と、
前記半導体層の、前記半導体基板側に対して反対側に、第2導電型の第1半導体領域を選択的に形成する第2工程と、
前記第1半導体領域の内部に、第1導電型の第2半導体領域を選択的に形成する第3工程と、
前記第1半導体領域の、前記第2半導体領域と前記半導体層との間の領域に接してゲート絶縁膜を形成する第4工程と、
前記ゲート絶縁膜を挟んで前記第1半導体領域の反対側にゲート電極を形成する第5工程と、
前記第1半導体領域と前記第2半導体領域に接する第1電極を形成する第6工程と、
前記半導体基板の裏面に第2電極を形成する第7工程と、
を含み、
前記半導体層に再結合中心となる少なくとも1つのエネルギー準位を形成して、前記半導体層を構成する炭化珪素の前記再結合中心に基づく見かけ上のバンドギャップを、前記半導体層を構成する炭化珪素と、前記ゲート絶縁膜を構成する絶縁膜と、の価電子帯間のエネルギーギャップよりも狭くすることを特徴とする炭化珪素半導体装置の製造方法。 - 前記第1工程では、
エピタキシャル成長により前記半導体層を形成し、
前記エピタキシャル成長中に前記半導体層にボロンを導入して、当該半導体層を構成する炭化珪素の価電子帯の上端のエネルギー準位よりも高い位置に前記再結合中心となる不純物準位を形成することを特徴とする請求項1に記載の炭化珪素半導体装置の製造方法。 - 前記第6工程の後、電子線照射により前記半導体層に欠陥を導入して、当該半導体層を構成する炭化珪素の伝導帯の下端のエネルギー準位よりも低い位置に前記再結合中心となる欠陥準位を形成する工程をさらに含むことを特徴とする請求項1または2に記載の炭化珪素半導体装置の製造方法。
- 前記電子線照射の照射量を1×1015/cm2以上1×1018/cm2以下とすることを特徴とする請求項3に記載の炭化珪素半導体装置の製造方法。
- 前記半導体層を構成する炭化珪素の前記再結合中心に基づく見かけ上のバンドギャップを2.61eVとすることを特徴とする請求項4に記載の炭化珪素半導体装置の製造方法。
- 前記電子線照射の後に300℃以上400℃以下の熱処理を行うことを特徴とする請求項3〜5のいずれか一つに記載の炭化珪素半導体装置の製造方法。
- 前記第4工程および前記第5工程で、前記ゲート絶縁膜および前記ゲート電極をプレーナゲート構造に形成することを特徴とする請求項1〜6のいずれか一つに記載の炭化珪素半導体装置の製造方法。
- 前記第4工程および前記第5工程で、前記第2半導体領域および前記第1半導体領域を貫通して前記半導体層に達するトレンチの内部に、前記ゲート絶縁膜を介して前記ゲート電極を設けたトレンチゲート構造に形成することを特徴とする請求項1〜6のいずれか一つに記載の炭化珪素半導体装置の製造方法。
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CN105814694B (zh) * | 2014-10-03 | 2019-03-08 | 富士电机株式会社 | 半导体装置以及半导体装置的制造方法 |
US10147813B2 (en) * | 2016-03-04 | 2018-12-04 | United Silicon Carbide, Inc. | Tunneling field effect transistor |
JP6911453B2 (ja) * | 2017-03-28 | 2021-07-28 | 富士電機株式会社 | 半導体装置およびその製造方法 |
CN109427886A (zh) * | 2017-08-25 | 2019-03-05 | 比亚迪股份有限公司 | Mosfet及制备方法、电子设备、车辆 |
US10693002B2 (en) * | 2017-09-07 | 2020-06-23 | Fuji Electric Co., Ltd. | Semiconductor device |
DE102018200676A1 (de) * | 2018-01-17 | 2019-07-18 | Robert Bosch Gmbh | Leistungselektronisches Bauelement |
CN110148629B (zh) * | 2019-03-18 | 2020-11-27 | 电子科技大学 | 一种沟槽型碳化硅mosfet器件及其制备方法 |
US11728422B2 (en) * | 2019-11-14 | 2023-08-15 | Stmicroelectronics S.R.L. | Power MOSFET device having improved safe-operating area and on resistance, manufacturing process thereof and operating method thereof |
IT202000015076A1 (it) | 2020-06-23 | 2021-12-23 | St Microelectronics Srl | Dispositivo elettronico in 4h-sic con prestazioni di corto circuito migliorate, e relativo metodo di fabbricazione |
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JP5818099B2 (ja) | 2012-04-27 | 2015-11-18 | 国立研究開発法人産業技術総合研究所 | 半導体装置 |
JP2014131008A (ja) * | 2012-11-29 | 2014-07-10 | Fuji Electric Co Ltd | ワイドバンドギャップ半導体装置 |
JP6291981B2 (ja) * | 2013-04-08 | 2018-03-14 | 富士電機株式会社 | 半導体装置の製造方法 |
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