JP2023026604A - 半導体装置 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 74
- 239000000758 substrate Substances 0.000 claims abstract description 48
- 210000000746 body region Anatomy 0.000 claims abstract description 42
- 239000012535 impurity Substances 0.000 claims description 27
- 230000015556 catabolic process Effects 0.000 abstract description 14
- 238000009413 insulation Methods 0.000 abstract 2
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 58
- 230000005684 electric field Effects 0.000 description 37
- 230000000694 effects Effects 0.000 description 17
- 238000009826 distribution Methods 0.000 description 13
- 230000005669 field effect Effects 0.000 description 11
- 238000000605 extraction Methods 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
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Abstract
Description
RESURF効果を簡単に説明する。ドリフト領域に対して縦方向にPN接合が形成されるように、ボディ領域と同じ導電型の半導体領域をドリフト領域下に形成し、ボディ領域と接続する。ボディ領域とドリフト領域に逆方向の電圧を加えるとボディ領域とドリフト領域との間に空乏層が広がる。この時、前記半導体領域とドリフト領域との間にも第2の空乏層が広がる。
このため、耐圧を維持しながら、ドリフト領域の抵抗値を小さくすることができ、結果としてトランジスタのオン抵抗を小さくすることができる。
えた際に、N型ドレイン領域8から深さ方向に空乏層が広がるように、N型ドリフト領域6の不純物濃度に対して十分小さくする必要がある。N+/P接合における耐圧(BV(V))とP型半導体層の不純物濃度(NA(cm-3))の関係はポアソンの式より導出でき、式(2)で与えられる。
位は0V)の等電位線を示す。図3のN型MOSトランジスタと異なり、基板電位はドレイン電位と等しくなっているため、SOI基板によるP型ドリフト領域36に対するRESURF効果が無くなって、P型ドリフト領域36における等電位線はN型ボディ領域35側に寄ってくるため、この部分での電界が集中してしまう。
1,101…P型(半導体)基板
2…絶縁層
3…(P型の)SOI層
4…P型埋め込み領域
5,105…(P型)ボディ領域
6…N型ドリフト領域
7…絶縁層
8…N型ドレイン領域
9…N型ソース領域
10…P型(給電)領域
11…ゲート酸化膜
12…ゲート電極(第1のフィールドプレート)
13…絶縁層
14,15,53,54…コンタクト
16…配線層(ソース電極,第2のフィールドプレート)
17…配線層(ドレイン電極)
18…P型埋め込み領域4(第1のフィールドプレート12の端部)近傍の領域
19…P型埋め込み領域4の端部近傍の領域
30…P型LDMOS電界効果トランジスタ
34…N型埋め込み領域
35…(N型)ボディ領域
36…P型ドリフト領域
38…P型ドレイン領域
39…P型ソース領域
40…N(給電)領域
51…第1の配線層(第2のフィールドプレート)
52,56…(第2の配線層の)ドレイン電極
55…第2の配線層(第2のフィールドプレート)
60…ダイオード
61…N型カソード領域
62…P型アノード領域
63…(シリコン)酸化膜
64…第1のフィールドプレート(ゲート電極,ポリシリコン)
65…絶縁層
66…(アノード領域引出し)コンタクト
67…(カソード領域引出し)コンタクト
68…(接続)コンタクト
69…アノード電極(第2のフィールドプレート)
70…カソード電極
102…P型エピタキシャル層
103…P+埋め込み領域
104…高濃度P+層
105…P型ボディ領域
106…ドリフト領域
107…ドレイン領域
108…ソース領域
109…ボディ領域給電領域
110…ゲート酸化膜
111…ゲート電極
112…絶縁層
113…ソース領域・ボディ領域引き出しコンタクト
114…ドレイン領域引出しコンタクト
115…ソース電極
116…ドレイン電極
117…ゲートフィールドプレート
118…絶縁層
119…SOI層
120…P+埋め込み領域103の端部近傍(電界が大きくなる領域)
Claims (8)
- 半導体基板の主面に形成された第1導電型のボディ領域と、
前記ボディ領域の表面に形成された第1導電型のアノード領域と、
前記ボディ領域と接するように形成された第2導電型のドリフト領域と、
前記ドリフト領域上に形成された第2導電型のカソード領域と、
前記ボディ領域に接し、前記ドリフト領域の下方に形成された第1導電型の埋め込み領域と、
前記アノード領域と前記ドリフト領域との間の前記ボディ領域及び前記アノード領域側の前記ドリフト領域上に、絶縁膜を介して形成された第1のフィールドプレートと、
前記第1のフィールドプレートは前記カソード領域方向に延在し、前記ドリフト領域上に第1の絶縁膜を介して形成され、
前記アノード領域に接し、前記第1のフィールドプレート上に第2の絶縁膜を介して形成された、第2のフィールドプレートと、を備え、
前記埋め込み領域と前記カソード領域との距離は、前記第1のフィールドプレートと前記カソード領域との距離よりも短く、
前記第2のフィールドプレートと前記カソード領域との距離よりも長いことを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第2のフィールドプレートは、前記カソード領域までの距離が異なる複数の配線層からなり、
前記複数の配線層において、上層にある配線層の前記カソード領域との距離は、下層にある配線層の前記カソード領域との距離よりも短く、
最上層の配線層の前記カソード領域との距離は、前記埋め込み領域の前記カソード領域との距離よりも短く、
最下層の配線層の前記カソード領域との距離は、前記第1のフィールドプレートの前記カソード領域との距離よりも短いことを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記ドリフト領域の最大不純物濃度は1e16/cm3以上であり、
前記埋め込み領域の最大不純物濃度は、前記埋め込み領域上の前記ドリフト領域の最大不純物濃度に対し1/3倍以上、1倍以下であることを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記半導体基板は、埋め込み絶縁層を介して形成されたSOI層を有し、
前記ボディ領域、前記アノード領域、前記ドリフト領域、前記カソード領域、前記埋め込み領域は、前記SOI層に形成されていることを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記第1のフィールドプレートは、前記ボディ領域と電気的に接続されていることを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記ボディ領域及び前記カソード領域間において、前記ドリフト領域が前記半導体基板の主面に沿って延在することを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記半導体基板の電圧は、前記カソード領域の電圧と等しいことを特徴とする半導体装置。 - 請求項1に記載の半導体装置であって、
前記半導体基板の電圧は、前記カソード領域の電圧と前記アノード領域の電圧との中間の電位にあることを特徴とする半導体装置。
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JP6229646B2 (ja) * | 2013-12-20 | 2017-11-15 | 株式会社デンソー | 半導体装置 |
US9722063B1 (en) * | 2016-04-11 | 2017-08-01 | Power Integrations, Inc. | Protective insulator for HFET devices |
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JP2002270830A (ja) * | 2001-03-12 | 2002-09-20 | Fuji Electric Co Ltd | 半導体装置 |
US20140284701A1 (en) * | 2012-07-31 | 2014-09-25 | Azure Silicon LLC | Power device integration on a common substrate |
JP2015095531A (ja) * | 2013-11-12 | 2015-05-18 | 日立オートモティブシステムズ株式会社 | 半導体装置 |
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