JP2016529720A - 縦型パワートランジスタデバイス - Google Patents
縦型パワートランジスタデバイス Download PDFInfo
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- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
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- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
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Abstract
Description
本開示は、パワートランジスタデバイスに関し、詳細には、パワー金属酸化物半導体電界効果トランジスタ(MOSFET)に関する。
[背景技術]
パワー金属酸化物半導体電界効果トランジスタ(MOSFET)は、高出力用途において使用するのに適合するタイプのトランジスタである。一般に、パワーMOSFETデバイスは縦型構造を有し、ソース及びゲートコンタクトは、基板上に形成されたドリフト層によってドレインコンタクトから分離されるMOSFETデバイスの第1の表面上に位置する。縦型MOSFETは、縦型拡散MOSFET(VDMOSFET)又は二重拡散MOSFET(DMOSFET)と呼ばれることがある。その縦型構造に起因して、パワーMOSFETの定格電圧は、ドーピングとドリフト層の厚さの関数である。したがって、高電圧パワーMOSFETは、比較的小さな設置面積で達成することができる。
[発明の概要]
本開示は、基板と、基板上方のドリフト層と、ドリフト層上方の拡散層(spreading layer)とを含むトランジスタデバイスに関する。拡散層は、接合ゲート電界効果(JFET)領域によって分離された一対の接合インプラントを含む。各接合インプラントは、深ウェル領域と、ベース領域と、ソース領域とを含むことができる。トランジスタデバイスは、ゲート酸化物層、ゲートコンタクト、一対のソースコンタクト、及びドレインコンタクトを更に備えることができる。ゲート酸化物層は拡散層の一部上にあり、ゲート酸化物層は、各接合インプラントの各ソース領域と部分的に重なり合い、各ソース領域の間を延びる。ゲートコンタクトは、ゲート酸化物層の上面に位置する。各ソースコンタクトは、拡散層の一部上にあり、それにより、各ソースコンタクトは、各接合インプラントのソース領域と深ウェル領域の両方とそれぞれ部分的に重なり合う。ドレインコンタクトは、ドリフト層とは反対側の基板の表面上にある。
更なる実施形態によれば、拡散層は複数の層を含み、複数の層はそれぞれ、層のJFET領域からの距離に比例して徐々に減少する、異なるドーピング濃度を有する。
本明細書に組込まれ、かつ本明細書の一部を構成する添付図面は、本開示の幾つかの態様を示し、説明と共に、本開示の原理を説明するのに役立つ。
以下で述べる実施形態は、当業者が実施形態を実施することを可能にするために必要な情報を示し、実施形態を実施する上でのベストモードを示す。添付図面を考慮して以下の説明を読むと、当業者は、本開示の概念を理解することになり、また、本明細書で具体的に記載されていないこれらの概念の応用を認識することになる。これらの概念及び応用が本開示及び添付の特許請求の範囲の範囲内に入ることが理解されるべきである。
Claims (28)
- ゲートと、ソースと、ドレインと、漸変又は変動ドーピングプロファイルを有する拡散層と、ドリフト層とを備え、前記ゲート及び前記ソースが少なくともJFET領域によって前記ドレインから分離される、トランジスタデバイス。
- 前記JFET領域、前記拡散層、及び前記ドリフト層は炭化ケイ素を含む、請求項1に記載のトランジスタデバイス。
- 縦型配置の金属酸化物電界効果トランジスタ(MOSFET)である、請求項1に記載のトランジスタデバイス。
- 前記JFET領域が第1のドーピング濃度を有し、前記拡散層が、前記第1のドーピング濃度と異なる第2のドーピング濃度を有し、前記ドリフト層が、前記第1のドーピング濃度及び前記第2のドーピング濃度と異なる第3のドーピング濃度を有する、請求項1に記載のトランジスタデバイス。
- 前記拡散層は約2×1017cm−3〜約5×1016cm−3の範囲のドーピング濃度を有する、請求項4に記載のトランジスタデバイス。
- 前記JFET領域は約1×1016cm−3〜約2×1017cm−3の範囲のドーピング濃度を有する、請求項4に記載のトランジスタデバイス。
- (削除)
- 前記JFET領域の厚さは約0.75ミクロン〜約1ミクロンの範囲にある、請求項1に記載のトランジスタデバイス。
- 前記拡散層の厚さは約1.0ミクロン〜約2.5ミクロンの範囲にある、請求項1に記載のトランジスタデバイス。
- 前記ドリフト層の厚さは約3.5ミクロン〜約12ミクロンの範囲にある、請求項1に記載のトランジスタデバイス。
- 前記トランジスタデバイスの内部抵抗は約2.2mΩ/cm2未満である、請求項1に記載のトランジスタデバイス。
- 前記トランジスタデバイスは、OFF状態にある間に、前記ソースと前記ドレインとの間の少なくとも600Vの電圧を支持するように構成され、更に、前記トランジスタデバイスは約1.8mΩ/cm2未満の内部抵抗を有する、請求項1に記載のトランジスタデバイス。
- 前記トランジスタデバイスは、OFF状態にある間に、前記ソースと前記ドレインとの間の少なくとも1200Vの電圧を支持するように構成され、更に、前記トランジスタデバイスは約2.2mΩ/cm2未満の内部抵抗を有する、請求項1に記載のトランジスタデバイス。
- トランジスタデバイスであって、
基板と、
前記基板上のドリフト層と、
前記ドリフト層上の拡散層であって、JFET領域によって分離された一対の接合インプラントを含む、拡散層と、
前記拡散層の表面上のゲート及びソースと、
前記ドリフト層とは反対側の前記基板上のドレインと
を備える、トランジスタデバイス。 - 前記ゲートと前記拡散層との間にゲート酸化物を更に備える、請求項14に記載のトランジスタデバイス。
- 前記一対の接合インプラントの各々が、深ウェル領域、ベース領域、及びソース領域を備える、請求項14に記載のトランジスタデバイス。
- 前記ゲートは、該ゲートが前記一対の接合インプラントの各ソース領域に部分的と重なり合い、各ソース領域の間を延びるように、前記拡散層の一部上に位置する、請求項16に記載のトランジスタデバイス。
- 前記ソースは2つのセクションに分割され、前記ソースの各セクションは、前記拡散層の一部上にあり、それにより、前記ソースの各セクションは、前記一対の接合インプラントのそれぞれの接合インプラントの前記ソース領域及び前記深ウェル領域の両方とそれぞれ部分的に重なり合う、請求項17に記載のトランジスタデバイス。
- 縦型配置の金属酸化物電界効果トランジスタ(MOSFET)である、請求項14に記載のトランジスタデバイス。
- 前記ドリフト層及び前記拡散層は炭化ケイ素を含む、請求項14に記載のトランジスタデバイス。
- 前記JFET領域の幅は約3ミクロン以下である、請求項14に記載のトランジスタデバイス。
- 前記トランジスタデバイスの内部抵抗は約2.2mΩ/cm2未満である、請求項21に記載のトランジスタデバイス。
- 前記トランジスタデバイスは、OFF状態にある間に、前記ソースと前記ドレインとの間の少なくとも600Vの電圧を支持するように構成され、更に、前記トランジスタデバイスは約1.8mΩ/cm2未満の内部抵抗を有する、請求項14に記載のトランジスタデバイス。
- 前記トランジスタデバイスは、OFF状態にある間に、前記ソースと前記ドレインとの間の少なくとも1200Vの電圧を支持するように構成され、更に、前記トランジスタデバイスは約2.2mΩ/cm2未満の内部抵抗を有する、請求項14に記載のトランジスタデバイス。
- 前記ドリフト層の厚さは約3.5ミクロン〜約12ミクロンの範囲にある、請求項14に記載のトランジスタデバイス。
- 前記拡散層の厚さは約1.0ミクロン〜約2.5ミクロンの範囲にある、請求項14に記載のトランジスタデバイス。
- 前記JFET領域の厚さは約0.75ミクロン〜約1.0ミクロンの範囲にある、請求項14に記載のトランジスタデバイス。
- 前記一対の接合インプラントの各接合インプラントの厚さは約1.0ミクロン〜約2.0ミクロンの範囲にある、請求項14に記載のトランジスタデバイス。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/962,295 US9331197B2 (en) | 2013-08-08 | 2013-08-08 | Vertical power transistor device |
US13/962,295 | 2013-08-08 | ||
PCT/US2014/049941 WO2015021154A1 (en) | 2013-08-08 | 2014-08-06 | Vertical power transistor device |
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JP2018041765A Division JP6644823B2 (ja) | 2013-08-08 | 2018-03-08 | 縦型パワートランジスタデバイス |
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JP2016529720A true JP2016529720A (ja) | 2016-09-23 |
JP2016529720A5 JP2016529720A5 (ja) | 2017-05-25 |
JP6306704B2 JP6306704B2 (ja) | 2018-04-04 |
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- 2014-08-06 CN CN201480044619.0A patent/CN105431948A/zh active Pending
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USRE49913E1 (en) | 2024-04-09 |
CN105431948A (zh) | 2016-03-23 |
US9741842B2 (en) | 2017-08-22 |
JP2018125544A (ja) | 2018-08-09 |
TWI536575B (zh) | 2016-06-01 |
USRE48380E1 (en) | 2021-01-05 |
EP3031083B1 (en) | 2021-04-14 |
JP6644823B2 (ja) | 2020-02-12 |
WO2015021154A1 (en) | 2015-02-12 |
US9331197B2 (en) | 2016-05-03 |
US20150041886A1 (en) | 2015-02-12 |
EP3031083A1 (en) | 2016-06-15 |
US20160211360A1 (en) | 2016-07-21 |
JP6306704B2 (ja) | 2018-04-04 |
TW201515225A (zh) | 2015-04-16 |
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