JP5670308B2 - 炭化ケイ素半導体デバイスのためのエッジ終端構造及びその製造方法 - Google Patents
炭化ケイ素半導体デバイスのためのエッジ終端構造及びその製造方法 Download PDFInfo
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 119
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 118
- 239000004065 semiconductor Substances 0.000 title claims description 31
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- 230000005684 electric field Effects 0.000 description 14
- 229910052710 silicon Inorganic materials 0.000 description 14
- 239000010703 silicon Substances 0.000 description 14
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/861—Diodes
- H01L29/872—Schottky diodes
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
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- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
- H01L29/1608—Silicon carbide
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- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0603—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions
- H01L29/0607—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration
- H01L29/0611—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices
- H01L29/0615—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE]
- H01L29/0619—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE] with a supplementary region doped oppositely to or in rectifying contact with the semiconductor containing or contacting region, e.g. guard rings with PN or Schottky junction
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Description
図2は、オフセットフィールドプレートを有するMFGR構造を示す図である。図2に示すように、n型半導体層10は、その中に形成された主要接合12と、一連のフローティングガードリング14を有する。酸化膜層16が、半導体層10上に設けられ、開口部がこの酸化膜層16中に設けられている。オフセットフィールドプレート18が、この開口部中に設けられて、フローティングガードリング14に接触させられ、酸化膜層16上に延在している。
エッジ終端構造の製造方法について、本明細書中で説明しており、これらの製造方法も提供される。
図3は、本発明の特定の実施形態を示す炭化ケイ素半導体デバイスの断面図である。図3に示すように、炭化ケイ素半導体デバイス20において、低濃度にドーピングしたn型炭化ケイ素層などの炭化ケイ素層30は、その中に、例えば、p型炭化ケイ素の主要接合32、及びp型炭化ケイ素フローティングガードリングなど、複数のフローティングガードリング34を備えている。酸化膜層などの絶縁層26が、炭化ケイ素層30上に設けられる。この絶縁層26は、堆積させられた酸化膜又は成長された酸化膜とすることができ、当業者に知られている技術を利用して製造することができる。本発明の特定の実施形態においては、この絶縁層26は、SiO2などの酸化膜、Si3N4などの窒化膜、酸化膜−窒化膜−酸化膜構造及び/又は酸窒化膜、あるいはポリイミド層などの有機膜とすることができる。
Claims (19)
- 炭化ケイ素半導体デバイスのためのエッジ終端構造であって、
炭化ケイ素ベースの半導体接合を少なくとも部分的に取り囲み、炭化ケイ素層中において複数の間隔をもって配置された同心円のフローティングガードリングと、
該フローティングガードリング上に設けられた絶縁層と、
前記フローティングガードリング間で、前記絶縁層に隣接して設けられた炭化ケイ素表面電荷補償領域と
を備え、
前記表面電荷補償領域は、1×10 12 から7×10 12 cm −2 のドーズ電荷を有し、前記炭化ケイ素層中に0.1μmから2.0μmの距離だけ延び、
前記炭化ケイ素層がn型炭化ケイ素層であって前記フローティングガードリング及び前記表面電荷補償領域がp型炭化ケイ素であるか、または前記炭化ケイ素層がp型炭化ケイ素層であって前記フローティングガードリング及び前記表面電荷補償領域がn型炭化ケイ素であるエッジ終端構造。 - 前記フローティングガードリングは、前記炭化ケイ素層中に第1の距離だけ延びており、前記表面電荷補償領域は、前記炭化ケイ素層中に第2の距離だけ延びており、前記第2の距離は、前記第1の距離より短い請求項1に記載のエッジ終端構造。
- 前記表面電荷補償領域は、前記フローティングガードリングより低濃度にドーピングされている請求項2に記載のエッジ終端構造。
- 前記表面電荷補償領域は、隣接するフローティングガードリング間に延在しているが、2つの隣接するフローティングガードリング間に完全には延在していない請求項3に記載のエッジ終端構造。
- 前記表面電荷補償領域は、隣接するフローティングガードリング間に完全に延在している請求項3に記載のエッジ終端構造。
- 前記表面電荷補償領域は、前記炭化ケイ素層中に注入領域を備えている請求項5に記載のエッジ終端構造。
- 前記表面電荷補償領域は、複数の表面電荷補償領域を備えている請求項6に記載のエッジ終端構造。
- 前記表面電荷補償領域は、前記炭化ケイ素層上に設けられた第2の炭化ケイ素層を備えている請求項1に記載のエッジ終端構造。
- 前記表面電荷補償領域は、前記絶縁層に隣接する前記表面電荷補償領域の表面が、前記絶縁層の表面電荷によって部分的に空乏化し、逆バイアスが前記デバイスに印加されたときに完全に空乏化するようなドーパント濃度を有する請求項1に記載のエッジ終端構造。
- 前記表面電荷補償領域は、2つの隣接するフローティングガードリングの間に完全には延在せず、前記表面電荷補償領域と前記2つの隣接するフローティングガードリングのうちの一方との間に0.1μmから2.0μmのギャップが設けられている請求項1に記載のエッジ終端構造。
- 前記フローティングガードリングは、前記炭化ケイ素層中に0.1μmから2.0μmだけ延びている請求項1に記載のエッジ終端構造。
- 前記フローティングガードリングは、0.1μmから10μmの間隔を有する請求項1に記載のエッジ終端構造。
- 前記フローティングガードリングは、前記デバイスの前記半導体接合から2μmから1mmの距離だけ延びている請求項1に記載のエッジ終端構造。
- 前記フローティングガードリングは、1×1018cm−3から1×1020cm−3のドーパント濃度を有している請求項1に記載のエッジ終端構造。
- 炭化ケイ素半導体デバイスのためのエッジ終端構造の製造方法であって、
炭化ケイ素ベースの半導体接合の少なくとも一部分を取り囲み、炭化ケイ素層中において複数の間隔をもって配置された同心円のフローティングガードリングを形成するステップと、
前記フローティングガードリング上に絶縁層を形成するステップと、
前記フローティングガードリング間で、前記絶縁層と隣接して炭化ケイ素表面電荷補償領域を形成するステップと
を有し、
前記表面電荷補償領域は、1×10 12 から7×10 12 cm −2 のドーズ電荷を有し、前記炭化ケイ素層中に0.1μmから2.0μmの距離だけ延び、
前記炭化ケイ素層がn型炭化ケイ素層であって前記フローティングガードリング及び前記表面電荷補償領域がp型炭化ケイ素であるか、または前記炭化ケイ素層がp型炭化ケイ素層であって前記フローティングガードリング及び前記表面電荷補償領域がn型炭化ケイ素であるエッジ終端構造の製造方法。 - 炭化ケイ素半導体デバイスのためのエッジ終端構造であって、
炭化ケイ素ベースの半導体接合の少なくとも一部分を取り囲み、炭化ケイ素層中において複数の間隔をもって配置された同心円のフローティングガードリングと、
前記フローティングガードリング上に設けられた絶縁層と、
前記フローティングガードリングの領域中において、前記絶縁層と前記炭化ケイ素層の間の境界面における電荷の効果を中和する手段と
を備え、
前記中和する手段は、1×10 12 から7×10 12 cm −2 のドーズ電荷を有し、前記炭化ケイ素層中に0.1μmから2.0μmの距離だけ延び、
前記炭化ケイ素層がn型炭化ケイ素層であって前記フローティングガードリング及び前記中和する手段がp型炭化ケイ素であるか、または前記炭化ケイ素層がp型炭化ケイ素層であって前記フローティングガードリング及び前記中和する手段がn型炭化ケイ素であるエッジ終端構造。 - 前記中和する手段は、ブロッキング電圧が前記デバイスに印加されないときに隣接するフローティングガードリングを接続し、前記ブロッキング電圧が前記デバイスに印加されたときに隣接するフローティングガードリングを分離する手段を備えている請求項16に記載のエッジ終端構造。
- 前記中和する手段は、隣接するフローティングガードリング間の表面電荷補償領域を備えている請求項17に記載のエッジ終端構造。
- 前記表面電荷補償領域中の電荷量は、該表面電荷補償領域が、前記デバイスのブロッキング電圧より低い電圧において空乏化する程度に少ない請求項18に記載のエッジ終端構造。
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US7364978B2 (en) * | 2003-04-25 | 2008-04-29 | Sumitomo Electric Industries, Ltd. | Method of fabricating semiconductor device |
US8901699B2 (en) * | 2005-05-11 | 2014-12-02 | Cree, Inc. | Silicon carbide junction barrier Schottky diodes with suppressed minority carrier injection |
CN101258608B (zh) * | 2005-09-08 | 2010-05-19 | 三菱电机株式会社 | 半导体装置以及半导体装置的制造方法 |
US8432012B2 (en) | 2006-08-01 | 2013-04-30 | Cree, Inc. | Semiconductor devices including schottky diodes having overlapping doped regions and methods of fabricating same |
US7728402B2 (en) * | 2006-08-01 | 2010-06-01 | Cree, Inc. | Semiconductor devices including schottky diodes with controlled breakdown |
EP2052414B1 (en) | 2006-08-17 | 2016-03-30 | Cree, Inc. | High power insulated gate bipolar transistors |
US7955929B2 (en) * | 2007-01-10 | 2011-06-07 | Freescale Semiconductor, Inc. | Method of forming a semiconductor device having an active area and a termination area |
US8835987B2 (en) * | 2007-02-27 | 2014-09-16 | Cree, Inc. | Insulated gate bipolar transistors including current suppressing layers |
US8866150B2 (en) * | 2007-05-31 | 2014-10-21 | Cree, Inc. | Silicon carbide power devices including P-type epitaxial layers and direct ohmic contacts |
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JP2012084910A (ja) | 2012-04-26 |
JP2006516815A (ja) | 2006-07-06 |
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TWI336522B (en) | 2011-01-21 |
JP5122810B2 (ja) | 2013-01-16 |
JP5695996B2 (ja) | 2015-04-08 |
US7842549B2 (en) | 2010-11-30 |
CA2512580A1 (en) | 2004-08-05 |
EP2261987B1 (en) | 2019-09-18 |
TW200505018A (en) | 2005-02-01 |
JP2011243999A (ja) | 2011-12-01 |
WO2004066392A1 (en) | 2004-08-05 |
US20090035926A1 (en) | 2009-02-05 |
US20060054895A1 (en) | 2006-03-16 |
EP2261987A2 (en) | 2010-12-15 |
EP1584110B1 (en) | 2018-02-21 |
KR20050109924A (ko) | 2005-11-22 |
EP2261987A3 (en) | 2014-01-15 |
US20040135153A1 (en) | 2004-07-15 |
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