JP2005526392A - 電界救済特性を有するトレンチ型mosfet - Google Patents
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- 239000004065 semiconductor Substances 0.000 claims description 2
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- 150000002500 ions Chemical class 0.000 description 6
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- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 6
- 229920005591 polysilicon Polymers 0.000 description 6
- 238000009826 distribution Methods 0.000 description 4
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- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
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- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
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- H01L29/063—Reduced surface field [RESURF] pn-junction structures
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66674—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/66712—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/66734—Vertical DMOS transistors, i.e. VDMOS transistors with a step of recessing the gate electrode, e.g. to form a trench gate electrode
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Abstract
【解決手段】 トレンチ型MOSFETにおいて、この絶縁破壊電圧を上昇させるためにベース領域よりも下方に、電界救済領域を設ける。
Description
a)絶縁破壊電圧を上昇させ、かつON抵抗値を低下させる。
b)高電界領域をトレンチの角部から引き離すことにより、装置の信頼性を高めることができる。
c)ベースダイオード領域が後退して、積層欠陥等の欠損部が、漏洩電流の通り道となりうる高導電性接触領域に到達するのを防止し、ドレイン・ソース遮断電流(Idss)の漏洩を減少させることができる。
d)絶縁破壊電圧とドレイン・ソース遮断電流(Idss)をエッチングの深さの変動に影響されないようにすることにより、トレンチと接合領域をエッチングする際の制約を小さくすることができる。
3 ベース領域
4 ソース領域
5 ゲート電極
6 トレンチ
7 絶縁中間層
8 高導電性接触領域
9 ソース接合部
10 ドレイン接合部
11 高導電性領域
12 電界救済領域
13 酸化物層
15 ゲート酸化膜
16 凹部
19 ウィンドー
20 エピタキシャル層
22 金型
23 ウィンドー
24 電界酸化膜層
25 ポリシリコン層
26 ウィンドー
28 ソース層
29 フォトレジスト層
30 酸化膜
32 フォトレジスト膜
34 ウィンドー
Claims (13)
- 基板と、
第1の導電型の共通導電領域と、
前記共通導電領域上に、第1の深さを有するように形成された第2の導電型のチャンネル領域と、
前記第1の深さよりも下方に延びるように形成され、各トレンチは、少なくとも1つの側壁上に位置するゲート絶縁層を含み、かつ導電性のゲート材料により充填されるようになっている複数のトレンチと、
前記チャンネル領域の上方に形成された、前記第1の導電型の複数の導電領域と、
前記共通導電領域内にあって前記第1の深さよりも下方において形成され、前記第2の導電型を有し、かつ少量のドーパントを含む複数の電界救済領域とを備えるMOSゲート装置。 - 前記第1の導電型の導電領域とオーミック接合をなす第1の接合部も備えていることを特徴とする請求項1記載のMOSゲート装置。
- 前記第1の導電型の導電領域は、ソース領域であることを特徴とする請求項1記載のMOSゲート装置。
- 前記チャンネル領域において前記各トレンチの間に位置し、かつ前記第1の接合部とオーミック接合をなす、前記第2の導電型の複数の高導電性領域も備えていることを特徴とする請求項1記載のMOSゲート装置。
- 前記各高導電性領域は、凹部の底部に形成され、前記第1の導電型の共通導電領域は、前記各凹部の側壁に隣接して位置していることを特徴とする請求項4記載のMOSゲート装置。
- 前記基板とオーミック接合をなす第2の接合部も備えていることを特徴とする請求項1記載のMOSゲート装置。
- 前記電界救済領域は、前記チャンネル領域から離間されていることを特徴とする請求項1記載のMOSゲート装置。
- 前記電界救済領域は、前記ベース領域と合体していることを特徴とする請求項1記載のMOSゲート装置。
- 前記複数の電界救済領域よりも深い位置に形成された、もう1つの組をなす複数の電界救済領域を、さらに備えていることを特徴とする請求項1記載のMOSゲート装置。
- 第1の導電型の共通導電領域上に形成された第2の導電型のチャンネル領域を含むMOSゲート装置の絶縁破壊電圧を上昇させる方法であって、前記チャンネル領域よりも下方において、前記共通導電領域内に、少量のドーパントを含み、前記チャンネル領域と同一の導電型を有する電界救済領域を形成する工程を含む方法。
- 前記電界救済領域を前記チャンネル領域から離間させる工程をも含むことを特徴とする請求項10記載の方法。
- 前記電界救済領域を前記チャンネル領域と合体させる工程をも含むことを特徴とする請求項10記載の方法。
- 前記MOSゲート装置は、それぞれがゲート構造を支持する、少なくとも2つの横方向に離間したトレンチを含むようになっており、前記電界救済領域を、これらトレンチの間の領域に位置させる工程をも含むことを特徴とする請求項10記載の方法。
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Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37817302P | 2002-05-14 | 2002-05-14 | |
US10/437,984 US7161208B2 (en) | 2002-05-14 | 2003-05-13 | Trench mosfet with field relief feature |
PCT/US2003/015117 WO2003098663A2 (en) | 2002-05-14 | 2003-05-14 | Trench mosfet with field relief feature |
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JP2005526392A true JP2005526392A (ja) | 2005-09-02 |
JP4201764B2 JP4201764B2 (ja) | 2008-12-24 |
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US (1) | US7161208B2 (ja) |
EP (1) | EP1504474A4 (ja) |
JP (1) | JP4201764B2 (ja) |
AU (1) | AU2003251298A1 (ja) |
WO (1) | WO2003098663A2 (ja) |
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JP2005236267A (ja) * | 2004-01-23 | 2005-09-02 | Toshiba Corp | 半導体装置 |
JP2007005657A (ja) * | 2005-06-24 | 2007-01-11 | Nec Electronics Corp | 半導体装置及び半導体装置の製造方法 |
JP2008108962A (ja) * | 2006-10-26 | 2008-05-08 | Toshiba Corp | 半導体装置 |
JP2012039082A (ja) * | 2010-07-12 | 2012-02-23 | Denso Corp | 半導体装置およびその製造方法 |
JP2013084899A (ja) * | 2011-08-24 | 2013-05-09 | Rohm Co Ltd | 半導体装置およびその製造方法 |
JP2017112161A (ja) * | 2015-12-15 | 2017-06-22 | 三菱電機株式会社 | 半導体装置 |
JP2021129057A (ja) * | 2020-02-14 | 2021-09-02 | 豊田合成株式会社 | 半導体素子の製造方法 |
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US6916745B2 (en) | 2003-05-20 | 2005-07-12 | Fairchild Semiconductor Corporation | Structure and method for forming a trench MOSFET having self-aligned features |
JP2004335990A (ja) * | 2003-03-10 | 2004-11-25 | Fuji Electric Device Technology Co Ltd | Mis型半導体装置 |
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GB0417749D0 (en) * | 2004-08-10 | 2004-09-08 | Eco Semiconductors Ltd | Improved bipolar MOSFET devices and methods for their use |
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JP2008098530A (ja) * | 2006-10-13 | 2008-04-24 | Toshiba Corp | 半導体装置の製造方法 |
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2003
- 2003-05-13 US US10/437,984 patent/US7161208B2/en not_active Expired - Lifetime
- 2003-05-14 WO PCT/US2003/015117 patent/WO2003098663A2/en active Application Filing
- 2003-05-14 AU AU2003251298A patent/AU2003251298A1/en not_active Abandoned
- 2003-05-14 EP EP03753029A patent/EP1504474A4/en not_active Ceased
- 2003-05-14 JP JP2004506063A patent/JP4201764B2/ja not_active Expired - Lifetime
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JP2005236267A (ja) * | 2004-01-23 | 2005-09-02 | Toshiba Corp | 半導体装置 |
JP4564362B2 (ja) * | 2004-01-23 | 2010-10-20 | 株式会社東芝 | 半導体装置 |
JP2007005657A (ja) * | 2005-06-24 | 2007-01-11 | Nec Electronics Corp | 半導体装置及び半導体装置の製造方法 |
JP2008108962A (ja) * | 2006-10-26 | 2008-05-08 | Toshiba Corp | 半導体装置 |
JP2012039082A (ja) * | 2010-07-12 | 2012-02-23 | Denso Corp | 半導体装置およびその製造方法 |
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JP2013084899A (ja) * | 2011-08-24 | 2013-05-09 | Rohm Co Ltd | 半導体装置およびその製造方法 |
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JP2017112161A (ja) * | 2015-12-15 | 2017-06-22 | 三菱電機株式会社 | 半導体装置 |
JP2021129057A (ja) * | 2020-02-14 | 2021-09-02 | 豊田合成株式会社 | 半導体素子の製造方法 |
JP7238828B2 (ja) | 2020-02-14 | 2023-03-14 | 豊田合成株式会社 | 半導体素子の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
WO2003098663A2 (en) | 2003-11-27 |
WO2003098663A3 (en) | 2004-12-09 |
US7161208B2 (en) | 2007-01-09 |
JP4201764B2 (ja) | 2008-12-24 |
AU2003251298A1 (en) | 2003-12-02 |
EP1504474A4 (en) | 2006-12-06 |
US20030213993A1 (en) | 2003-11-20 |
EP1504474A2 (en) | 2005-02-09 |
AU2003251298A8 (en) | 2003-12-02 |
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