JP5784773B2 - 組み込まれたpn接合を有するショットキダイオード - Google Patents
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- 239000004065 semiconductor Substances 0.000 claims description 59
- 239000000463 material Substances 0.000 claims description 32
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000010432 diamond Substances 0.000 claims description 4
- 239000002800 charge carrier Substances 0.000 description 11
- 230000000903 blocking effect Effects 0.000 description 10
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000002019 doping agent Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
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Description
図1は、第1導電型、ここではn型にドープされたドリフト層3’により分離されたソースコンタクト1’とドレインコンタクト2’とを有する公知の半導体デバイスを示す。ドリフト層は、ここでは1つの副層であり、即ち、高ドープの副層5’である。デバイスは、更に、ドリフト層の上に、ソースコンタクトに属し、ドリフト層に対してショットキコンタクトを形成し、ドリフト層の上で、ここではpである第2導電型のドーパントでドープされた半導体材料の追加の層の形態の領域7’により横方向に分離される複数の金属層6’を含む。追加の層7’は、好適には高ドープである。
本発明は、この問題を解決するものであり、本発明の第1の具体例にかかるデバイスは、図3に模式的に示される。図1、2の従来技術のデバイスに対応するこのデバイスの部分は、同じ参照符号により示されている。このデバイスの半導体材料はSiCである。このデバイスは、公知のデバイスと、ドリフト層3が2つの副層を有する点、即ち、ソースコンタクトに近い第1の低ドープの副層4と、ドレインコンタクトに近いより高ドープの第2の副層5を有し、少なくとも1つの追加の層7”は実質的により大きな横方向の拡がりを有し、これによりドリフト層との界面の面積が、隣接するそのような層7よりも大きくなる。
Claims (19)
- 第1導電型にドープされたドリフト層(3)と、
ドリフト層(3)の第1表面上のドレインコンタクト(2)と、
第2導電型にドープされたドレインコンタクト(2)に対向する、ドリフト層(3)の第2表面上の、複数の半導体材料の追加層(7、7’)と、
ソースコンタクト(1)と、を含み、
複数の半導体材料の追加層(7、7’)は、ドリフト層(3)の第2表面上に複数の半導体材料の同心円リングを形成するように配置され、複数の半導体材料の同心円リングの間でこれらを横方向に分離するドリフト層(3)の第2表面の領域は、ショットキコンタクト領域(6)を形成し、
ソースコンタクト(1)は、ショットキコンタクト領域(6)でドリフト層(3)と直接接触する半導体デバイス。 - ドリフト層(3)は、ソースコンタクト(1)に最も近い低ドープのサブレイヤ(4)と、ドレインコンタクト(2)に最も近い高ドープのサブレイヤ(5)とを含む請求項1に記載の半導体デバイス。
- 低ドープのサブレイヤ(4)は1015cm−3より低いドーピング濃度を有し、高ドープのサブレイヤ(5)は1016cm−3より高いドーピング濃度を有する請求項2に記載の半導体デバイス。
- ショットキコンタクト領域(6)は、ドリフト層(3)の中の対応するリセス(11)の底に配置されて、隣り合う複数の半導体材料の追加層(7、7’)の間を分離し、さらにショットキコンタクト領域(6)は、複数の半導体材料の追加層(7、7’)とドリフト層(3)の第2表面との間の界面に対して縦方向に離れて配置される請求項1〜3のいずれかに記載の半導体デバイス。
- ドリフト層(3)と複数の半導体材料の追加層(7、7’)とは、SiCから形成される請求項1〜4のいずれかに記載の半導体デバイス。
- 第1導電型はn型で、第2導電型はp型である請求項5に記載の半導体デバイス。
- ドリフト層(3)の第2表面に沿った横方向に、少なくとも7つ毎の複数の半導体材料の追加層(7、7’)が、隣接する複数の半導体材料の追加層(7、7’)より大きな横方向の長さを有する請求項1〜6のいずれかに記載の半導体デバイス。
- 複数の半導体材料の追加層(7、7’)の少なくとも1つは、隣接する複数の半導体材料の追加層(7、7’)の1つの横方向の長さの少なくとも1.5倍の大きさと等しい横方向の長さを有する請求項1〜7のいずれかに記載の半導体デバイス。
- 複数の半導体材料の追加層(7、7’)の少なくとも1つの横方向の長さは、5〜15マイクロメーターで、隣接する複数の半導体材料の追加層(7、7’)の1つの横方向の長さは、2〜4マイクロメーターである請求項8に記載の半導体デバイス。
- 隣接する複数の半導体材料の追加層(7、7’)の間の横方向の長さは、ドリフト層(3)の第2表面に沿って一定である請求項1〜9のいずれかに記載の半導体デバイス。
- 隣接する複数の半導体材料の追加層(7、7’)の間の横方向の長さは、ドリフト層(3)の膜厚と同じかそれより小さい請求項1〜10のいずれかに記載の半導体デバイス。
- ドリフト層(3)と複数の半導体材料の追加層(7、7’)は、ダイヤモンドで形成される請求項1〜4および6〜11のいずれかに記載の半導体デバイス。
- 第1導電型はp型で、第2導電型はn型である請求項12に記載の半導体デバイス。
- ドリフト層(3)の第2表面に沿った横方向に、少なくとも6つ毎の複数の半導体材料の追加層(7、7’)が、隣接する複数の半導体材料の追加層(7、7’)より大きな横方向の長さを有する請求項1〜13のいずれかに記載の半導体デバイス。
- ドリフト層(3)の第2表面に沿った横方向に、少なくとも5つ毎の複数の半導体材料の追加層(7、7’)が、隣接する複数の半導体材料の追加層(7、7’)より大きな横方向の長さを有する請求項1〜14のいずれかに記載の半導体デバイス。
- ドリフト層(3)の第2表面に沿った横方向に、少なくとも4つ毎の複数の半導体材料の追加層(7、7’)が、隣接する複数の半導体材料の追加層(7、7’)より大きな横方向の長さを有する請求項1〜15のいずれかに記載の半導体デバイス。
- 複数の半導体材料の追加層(7、7’)の少なくとも1つは、隣接する複数の半導体材料の追加層(7、7’)の1つの横方向の長さの少なくとも2倍の大きさと等しい横方向の長さを有する請求項1〜16のいずれかに記載の半導体デバイス。
- 複数の半導体材料の追加層(7、7’)の少なくとも1つは、隣接する複数の半導体材料の追加層(7、7’)の1つの横方向の長さの少なくとも2〜4倍の大きさと等しい横方向の長さを有する請求項1〜17のいずれかに記載の半導体デバイス。
- 複数の半導体材料の追加層(7、7’)の少なくとも1つは、隣接する複数の半導体材料の追加層(7、7’)の1つの横方向の長さの少なくとも3〜4倍の大きさと等しい横方向の長さを有する請求項1〜18のいずれかに記載の半導体デバイス。
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US8232558B2 (en) * | 2008-05-21 | 2012-07-31 | Cree, Inc. | Junction barrier Schottky diodes with current surge capability |
JP5047133B2 (ja) * | 2008-11-19 | 2012-10-10 | 昭和電工株式会社 | 半導体装置の製造方法 |
JP5175872B2 (ja) | 2010-01-21 | 2013-04-03 | 株式会社東芝 | 半導体整流装置 |
CN102754213B (zh) * | 2010-02-23 | 2015-08-05 | 菅原良孝 | 半导体装置 |
US9117739B2 (en) | 2010-03-08 | 2015-08-25 | Cree, Inc. | Semiconductor devices with heterojunction barrier regions and methods of fabricating same |
JP5172916B2 (ja) | 2010-09-08 | 2013-03-27 | 株式会社東芝 | 半導体整流装置 |
JP5306392B2 (ja) | 2011-03-03 | 2013-10-02 | 株式会社東芝 | 半導体整流装置 |
JP5377548B2 (ja) | 2011-03-03 | 2013-12-25 | 株式会社東芝 | 半導体整流装置 |
US8680587B2 (en) | 2011-09-11 | 2014-03-25 | Cree, Inc. | Schottky diode |
US8952481B2 (en) | 2012-11-20 | 2015-02-10 | Cree, Inc. | Super surge diodes |
JP6203074B2 (ja) | 2014-02-17 | 2017-09-27 | 株式会社東芝 | 半導体装置およびその製造方法 |
US11171248B2 (en) | 2019-02-12 | 2021-11-09 | Semiconductor Components Industries, Llc | Schottky rectifier with surge-current ruggedness |
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JP4892787B2 (ja) * | 2001-04-09 | 2012-03-07 | 株式会社デンソー | ショットキーダイオード及びその製造方法 |
SE0101848D0 (sv) * | 2001-05-25 | 2001-05-25 | Abb Research Ltd | A method concerning a junction barrier Schottky diode, such a diode and use thereof |
US6524900B2 (en) | 2001-07-25 | 2003-02-25 | Abb Research, Ltd | Method concerning a junction barrier Schottky diode, such a diode and use thereof |
FR2832547A1 (fr) * | 2001-11-21 | 2003-05-23 | St Microelectronics Sa | Procede de realisation d'une diode schottky sur substrat de carbure de silicium |
DE10259373B4 (de) | 2002-12-18 | 2012-03-22 | Infineon Technologies Ag | Überstromfeste Schottkydiode mit niedrigem Sperrstrom |
US20050012143A1 (en) * | 2003-06-24 | 2005-01-20 | Hideaki Tanaka | Semiconductor device and method of manufacturing the same |
JP2005026408A (ja) * | 2003-07-01 | 2005-01-27 | Matsushita Electric Ind Co Ltd | 半導体素子およびその製造方法 |
US20060131686A1 (en) * | 2004-12-20 | 2006-06-22 | Silicon-Base Technology Corp. | LOCOS-based junction-pinched schottky rectifier and its manufacturing methods |
US7341932B2 (en) * | 2005-09-30 | 2008-03-11 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Schottky barrier diode and method thereof |
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US7728403B2 (en) | 2010-06-01 |
US20070278609A1 (en) | 2007-12-06 |
EP2492965B1 (en) | 2020-04-29 |
EP2492965A3 (en) | 2013-01-23 |
EP2492965A2 (en) | 2012-08-29 |
EP2033226A1 (en) | 2009-03-11 |
JP5736112B2 (ja) | 2015-06-17 |
JP2014143428A (ja) | 2014-08-07 |
JP2009539247A (ja) | 2009-11-12 |
EP2033226B1 (en) | 2012-07-11 |
WO2007139487A1 (en) | 2007-12-06 |
EP2033226A4 (en) | 2010-04-21 |
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