JP4542178B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP4542178B2 JP4542178B2 JP2008183496A JP2008183496A JP4542178B2 JP 4542178 B2 JP4542178 B2 JP 4542178B2 JP 2008183496 A JP2008183496 A JP 2008183496A JP 2008183496 A JP2008183496 A JP 2008183496A JP 4542178 B2 JP4542178 B2 JP 4542178B2
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- 239000004065 semiconductor Substances 0.000 title claims description 222
- 239000000758 substrate Substances 0.000 claims description 37
- 239000012535 impurity Substances 0.000 claims description 17
- 239000002344 surface layer Substances 0.000 claims description 10
- 108091006146 Channels Proteins 0.000 description 60
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- 239000011229 interlayer Substances 0.000 description 17
- 238000004519 manufacturing process Methods 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 230000015556 catabolic process Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 9
- 229910002601 GaN Inorganic materials 0.000 description 8
- 230000005684 electric field Effects 0.000 description 7
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
- 239000010931 gold Substances 0.000 description 4
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- 238000002230 thermal chemical vapour deposition Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
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- 102000004129 N-Type Calcium Channels Human genes 0.000 description 1
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 150000004767 nitrides Chemical class 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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- 230000005533 two-dimensional electron gas Effects 0.000 description 1
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Description
コンタクト領域の表面に絶縁ゲート電極部が設けられていると、ゲート絶縁膜がコンタクト領域とゲート電極を電気的に絶縁する。このため、コンタクト領域とゲート電極をオーバーラップさせることができる。これにより、ゲート電極の形成位置が多少ずれたとしても、ゲート電極をチャネル半導体領域に確実に対向させることができ、チャネル抵抗の増大を抑えることができる。
ドリフト半導体領域の表面の少なくとも一部にショットキー電極部が設けられていると、半導体装置がオフしたときに、p型半導体領域からn型のドリフト半導体領域に空乏層を効率的に伸ばすことができる。また、ドリフト半導体領域の表面にはショットキー電極部が設けられているので、半導体装置がオフしたときに、ドリフト半導体領域が完全に空乏化される前であっても、従来の半導体装置のように絶縁破壊といった問題が生じない。
本明細書で開示される半導体装置は、高い耐圧を確保しながらオン抵抗を低くすることができる。
コンタクト領域とゲート電極が、ゲート絶縁膜によって、より確実に絶縁される。
(特徴1)ソース領域(コンタクト領域)の表面にソース電極が設けられている。ソース電極は、層間絶縁膜によってゲート電極から分離されている。その層間絶縁膜と半導体基板の間に、ゲート絶縁膜が介在している。
(特徴2)アパーチャ領域は、III族窒化物半導体(窒化ガリウム)を主体とする。ゲート電極は、ニッケル、白金及び金から選択される少なくとも一種の金属元素を主体としている。
(特徴3)ゲート絶縁膜は、非プラズマ膜で形成されている。
図1に、縦型の半導体装置100の要部断面図を示す。半導体装置100は縦型のトランジスタであり、半導体基板28の表面にソース電極2が設けられており、半導体基板28の裏面にドレイン電極22が設けられている。ゲート電極10は、ソース電極2とドレイン電極22の導通経路の間に設けられており、ソース電極2とドレイン電極22の間で電流の導通状態と非導通状態を切換える。後述するが、ゲート電極は、絶縁ゲート電極部10aとショットキー電極部10bを有している。半導体装置100は、例えば車載用のインバータ回路に用いられる。半導体装置100は、高耐圧であるとともに低オン抵抗であるという特性が望まれる。以下、半導体装置100の形態を裏面側から詳細に説明する。
ゲート電極10に正の電圧が印加されていないときは、埋込み領域20からチャネル半導体領域8に向けて空乏層が形成されている。電子が、ソース領域18からチャネル半導体領域8を超えてアパーチャ領域12に移動することができない。そのため、ゲート電極10に正の電圧が印加されていないときは、半導体装置100がオフしている。半導体装置100は、ノーマリーオフ型の半導体装置である。
まず、図2に示すように、半導体基板28を完成させる。半導体基板28は、公知の方法を採用して製造することができるので説明を省略する。次に、図3に示すように、開口4aを有するゲート絶縁膜4を、半導体基板28の表面に形成する。ゲート絶縁膜4は、熱CVD法で形成される。そのため、ゲート絶縁膜4を形成するときに、半導体基板28の表面がプラズマ膜で覆われることはない。次に、図4に示すように、スパッタ法を利用して、半導体基板28の露出している表面とゲート絶縁膜4の表面に、ゲート電極10を蒸着する。その後、図5に示すように、ゲート電極10の所定部分をエッチングする。このときに、ゲート絶縁膜4はエッチングしない。
図8に、半導体装置200の要部断面図を示している。半導体装置200は、半導体装置100の変形例である。
半導体装置200は、横型のトランジスタである。p型半導体領域220の表面に、チャネル半導体領域208とドリフト半導体領域212が設けられている。チャネル半導体領域208の厚みT208は、ドリフト半導体領域212の厚みT212よりも薄い。そのため、ゲート電極210に電圧が印加されていないときに、チャネル半導体領域208は、p型半導体領域220から伸びる空乏層により空乏化される。そのため、電子が、ソース領域218からドリフト半導体領域212に移動することができない。
図9に、半導体装置300の要部断面図を示している。半導体装置300は、半導体装置200の変形例である。
半導体装置300も横型のトランジスタである。半導体装置300では、半導体基板328の厚みが均一である。但し、p型半導体領域320の厚みが異なる。範囲328aではp型半導体領域320が厚く、範囲328bではp型半導体領域320が薄い。その結果、チャネル半導体領域308の厚みT308よりも、ドリフト半導体領域321の厚みT321の方が厚い。半導体装置300では、p型半導体領域320の厚みを変化させているので、半導体基板328の厚みを均一にしたまま、ドリフト半導体領域321の厚みT321をチャネル半導体領域308の厚みT308よりも厚くすることができる。
4,204,304,404:ゲート絶縁膜
8,208,308,408:チャネル半導体領域
10,210,310,410:ゲート電極
10a,210a,310a:絶縁ゲート電極部
10b,210b,310b:ショットキーゲート電極部
12,212,312,412:ドリフト半導体領域
18,218,318,418:ソース領域(コンタクト領域)
20,220,320,420:p型半導体領域
22,222,322,422:ドレイン電極(主電極)
28,228,328,428:半導体基板
100,200,300,400:半導体装置
Claims (2)
- 一対の主電極間に設けられたゲート電極を有する半導体装置であって、
半導体基板の表層部に設けられており、一方の主電極に電気的に接続するコンタクト領域と、
前記コンタクト領域に隣接する半導体基板の表層部に設けられており、第1の厚みを有するチャネル半導体領域と、
前記チャネル半導体領域の裏面の少なくとも一部に接しており、p型不純物を含むp型半導体領域と、
半導体基板の表層部に設けられており、前記チャネル半導体領域と前記p型半導体領域の両者に隣接しており、前記第1の厚みよりも厚い第2の厚みを有するとともに、少なくとも一部にn型不純物を含むドリフト半導体領域と、
半導体基板の表面に設けられており、前記コンタクト領域から前記チャネル半導体領域を超えて前記ドリフト半導体領域にまで延びているゲート電極を備えており、
前記ゲート電極は、絶縁ゲート電極部とショットキー電極部を有し、前記絶縁ゲート電極部がゲート絶縁膜を介して前記コンタクト領域の表面に対向しており、前記ショットキー電極部が前記ドリフト半導体領域の表面に直接的に接触していることを特徴とする半導体装置。 - 前記絶縁ゲート電極部が、前記コンタクト領域と前記チャネル半導体領域の接合面を超えて前記ドリフト半導体領域に向けて延びていることを特徴とする請求項1に記載の半導体装置。
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JP2013201190A (ja) * | 2012-03-23 | 2013-10-03 | Toshiba Corp | 接合形電界効果トランジスタ及びその製造方法 |
JP6754308B2 (ja) * | 2017-02-06 | 2020-09-09 | 株式会社豊田中央研究所 | 半導体装置 |
KR20210061198A (ko) | 2019-11-19 | 2021-05-27 | 삼성전자주식회사 | 반도체 구조체, 이를 포함하는 트랜지스터 및 트랜지스터의 제조방법 |
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US5396087A (en) * | 1992-12-14 | 1995-03-07 | North Carolina State University | Insulated gate bipolar transistor with reduced susceptibility to parasitic latch-up |
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US6396085B1 (en) | 2000-04-25 | 2002-05-28 | The Furukawa Electric Co., Ltd | GaN-type semiconductor vertical field effect transistor |
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