JP4771694B2 - トレンチゲート電力デバイス及びそのエッジ終端技術 - Google Patents
トレンチゲート電力デバイス及びそのエッジ終端技術 Download PDFInfo
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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
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- H01L29/76—Unipolar devices, e.g. field effect transistors
- 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
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
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- 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
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- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
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- Ceramic Engineering (AREA)
- Computer Hardware Design (AREA)
- Manufacturing & Machinery (AREA)
- Electrodes Of Semiconductors (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
- Semiconductor Integrated Circuits (AREA)
Description
(参考文献)
[1]米国特許第4754310号(Coe,1988).
[2]米国特許第5216275号(Chen,1993).
[3]米国特許第5438215号(Tihanyi,1995).
[4]Jun Zeng, C. Frank Wheatley, Rick Stocks, Chris Kocon, and Stan Benczkowski, "Optimization of the body-diode of power MOSFETs for high efficient synchronous rectification," ISPSD 2000, pp.145-148.
Claims (5)
- 電力MOSFETの製造方法であって、
第1極性のドーパントによるドーピングが高濃度になされた基板を準備するステップと、
前記基板の一方の面に、第2極性のドーピングが実質的に均一になされたエピタキシャル層を成長せしめるステップと、
前記エピタキシャル層に前記基板上方で終端する複数のトレンチを形成するステップと、
前記トレンチの側壁及び底部上に薄いゲート酸化膜を形成するステップと、
前記トレンチに第1極性のドーパントを注入するステップであり、当該第1極性のドーパントは前記トレンチの底部と前記側壁の低部位とを通過し、前記トレンチの底部と前記側壁の低部位に近い前記エピタキシャル層にドープされるステップと、
前記基板をアニール処理し、前記トレンチの底部及び側壁の低部位に近いエピタキシャル層にドープされた第1極性の前記ドーパントを前記アニール処理によって拡散せしめて、連続且つ結合された第1極性のドリフト領域を形成するステップであり、前記アニール処理は、前記ドリフト領域と前記エピタキシャル層との連続したPN接合が前記トレンチ間に形成され、前記PN接合の高さが前記トレンチ間の前記エピタキシャル層内において、前記トレンチ近くで最大高さを有し且つ前記トレンチ間で最小高さを有するようになされるステップと、
を順に含み、さらに、
前記トレンチを導電性材料で充填することによってゲート電極を形成するステップと、
前記複数のトレンチ間にある前記エピタキシャル層の表面領域に、第1極性のドーパントによる高濃度のドーピングがなされたソース領域を形成するステップと、
前記基板の他方の面にドレイン電極を形成するステップと、
を含むことを特徴とする製造方法。 - 前記トレンチをエッチングする共にダイのエッジにおいて垂直面及び水平棚を有する段差をエッチングして形成するステップと、
前記垂直面に近い上部表面にゲートランナ(350)を形成するステップと、
前記ソース領域と同じ極性のドーパントを前記ダイの前記エッジの前記水平棚において大量にドープしたチャンネル停止領域(338)を形成するステップと、
前記チャンネル停止領域に亘り且つ接触する金属接触層(380)を形成するステップと、
を更に有することを特徴とする請求項1に記載の方法。 - 電力MOSFETであって、
第1極性のドーパントによるドーピングが高濃度になされて一方の面にドレイン電極が形成された基板と、
前記基板の他方の面に設けられた、第2極性のドーピングが実質的に均一になされたエピタキシャル層と、
前記エピタキシャル層に設けられた、前記基板上方で終端する複数のトレンチと、
前記トレンチの側壁及び底部上に形成されたゲート酸化膜と、
前記トレンチ内に充填されてゲート電極を形成する導電性材料と、
前記複数のトレンチ間にある前記エピタキシャル層の表面領域に設けられ、第1極性のドーパントによる高濃度のドーピングがなされたソース領域と、
前記エピタキシャル層内に前記基板の他方の面から前記トレンチの底部より上の高さにまで伸張して形成され、前記トレンチのうちの隣接するトレンチ間で連続し且つ結合された、第1極性のドーパントを含むドリフト領域であり、前記ドリフト領域は前記エピタキシャル層内の前記トレンチ間に連続したPN接合を形成していて、前記PN接合の高さは前記トレンチ近くで最大高さを有し且つ前記トレンチ間で最小高さを有しているドリフト領域と、
第2極性のドーパントが実質的に均一にドーピングされたチャンネル領域であり、前記側壁に隣接する前記ドリフト領域の上部境界から前記ソース領域の下部境界にまで伸長するチャンネル領域と、
を含むことを特徴とする電力MOSFET。 - 前記トレンチ内におけるゲート材料を覆うBPSG層(60)と、
エッジ終端部と、をさらに含み、
前記エッジ終端部は、前記エピタキシャル層を覆ってフィールド酸化層(340)、ポリシリコン層(370)及び、BPSG層(360)を有する垂直面と、前記エピタキシャル層内にチャンネル停止領域を形成すべくダイの外側エッジ上において前記第1極性のドーパントによる高濃度のドーピングがなされた領域(338)及び、前記チャンネル停止領域に亘って接触するチャンネルストッパ金属層(380)を有し且つ前記ダイより低く凹部をなす外側水平面と、からなることを特徴とする請求項3に記載の電力MOSFET。 - 前記チャンネル領域におけるドーパント濃度が前記チャンネルの大部分に亘って実質的に均一であることを特徴とする請求項3に記載の電力MOSFET。
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Application Number | Priority Date | Filing Date | Title |
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US10/138,913 | 2002-05-03 | ||
US10/138,913 US6784505B2 (en) | 2002-05-03 | 2002-05-03 | Low voltage high density trench-gated power device with uniformly doped channel and its edge termination technique |
PCT/US2003/011235 WO2003094200A2 (en) | 2002-05-03 | 2003-04-10 | Low voltage high density trench-gated power device with uniformly doped channel and its edge termination technique |
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JP2005524975A JP2005524975A (ja) | 2005-08-18 |
JP4771694B2 true JP4771694B2 (ja) | 2011-09-14 |
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US (4) | US6784505B2 (ja) |
JP (1) | JP4771694B2 (ja) |
CN (3) | CN100547808C (ja) |
AU (1) | AU2003228499A1 (ja) |
DE (1) | DE10392617T5 (ja) |
TW (1) | TWI225285B (ja) |
WO (1) | WO2003094200A2 (ja) |
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US6784505B2 (en) * | 2002-05-03 | 2004-08-31 | Fairchild Semiconductor Corporation | Low voltage high density trench-gated power device with uniformly doped channel and its edge termination technique |
US7557395B2 (en) * | 2002-09-30 | 2009-07-07 | International Rectifier Corporation | Trench MOSFET technology for DC-DC converter applications |
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US8093651B2 (en) * | 2005-02-11 | 2012-01-10 | Alpha & Omega Semiconductor Limited | MOS device with integrated schottky diode in active region contact trench |
US7948029B2 (en) | 2005-02-11 | 2011-05-24 | Alpha And Omega Semiconductor Incorporated | MOS device with varying trench depth |
US7737522B2 (en) * | 2005-02-11 | 2010-06-15 | Alpha & Omega Semiconductor, Ltd. | Trench junction barrier controlled Schottky device with top and bottom doped regions for enhancing forward current in a vertical direction |
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US8362547B2 (en) | 2005-02-11 | 2013-01-29 | Alpha & Omega Semiconductor Limited | MOS device with Schottky barrier controlling layer |
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CN100454519C (zh) * | 2005-10-11 | 2009-01-21 | 尔必达存储器株式会社 | 半导体器件及其制造方法 |
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CN101071826A (zh) | 2007-11-14 |
US6784505B2 (en) | 2004-08-31 |
CN1650437A (zh) | 2005-08-03 |
TWI225285B (en) | 2004-12-11 |
JP2005524975A (ja) | 2005-08-18 |
US20080023759A1 (en) | 2008-01-31 |
US20040171198A1 (en) | 2004-09-02 |
CN101673768B (zh) | 2013-02-06 |
WO2003094200A2 (en) | 2003-11-13 |
DE10392617T5 (de) | 2005-07-21 |
US20050272208A1 (en) | 2005-12-08 |
AU2003228499A1 (en) | 2003-11-17 |
AU2003228499A8 (en) | 2003-11-17 |
CN100565932C (zh) | 2009-12-02 |
US7633102B2 (en) | 2009-12-15 |
US20030205758A1 (en) | 2003-11-06 |
US6946348B2 (en) | 2005-09-20 |
TW200306646A (en) | 2003-11-16 |
CN101673768A (zh) | 2010-03-17 |
CN100547808C (zh) | 2009-10-07 |
WO2003094200A3 (en) | 2004-05-27 |
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