JPWO2014162969A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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Abstract
Description
<構成>
まず、第1実施形態に関する半導体装置の構成を説明する。図1は、活性領域に配置されるSBD内蔵MOSFETのユニットセルの断面模式図である。図2は、図1に示されたSBD内蔵MOSFETのユニットセルを上から見た図であり、図1の電極および絶縁膜等を透過し、半導体層が形成される領域のみを表現している。
続いて、本実施形態の半導体装置であるSBD内蔵MOSFETの製造方法について説明する。
次に、本実施形態における半導体装置であるSBD内蔵MOSFETの動作を、3つの状態に分けて簡単に説明する。
本実施形態によれば、半導体装置が、ドリフト層20と、第1ウェル領域としてのウェル領域30と、第2ウェル領域としての広域ウェル領域31と、第1離間領域22と、ソース領域40と、第1および第2ショットキー電極としてのショットキー電極75と、第1オーミック電極としてのオーミック電極70と、第2離間領域21と、第3離間領域23と、ゲート電極60と、第2絶縁膜としてのゲート絶縁膜50または層間絶縁膜55と、第1ソース電極としてのソース電極80とを備える。
<構成>
図9(a)は、活性領域の終端部分のうち、ゲート電極82に隣接する箇所の構造を説明する図であり、図3のa−a’の位置に相当する断面模式図である。また、図9(b)は、図9(a)の箇所の平面模式図であり、電極や絶縁膜等を透過し、半導体領域のみが表現されている。
本実施形態がもたらす効果は、第1実施形態と同様に、広域ウェル領域31Bとドリフト層20とからなるpnダイオードが動作することを抑制し、広域ウェル領域31Bに隣接する活性領域のドリフト層20にホールが注入される量を低減することである。よって、活性領域のドリフト層20における結晶欠陥の発生を抑制することができる。
<構成>
図11(a)は、活性領域の終端部分のうち、ゲート電極82に隣接する箇所の構造を説明する図であり、図3のa−a’の位置に相当する断面模式図である。また、図11(b)は、図11(a)の箇所の平面模式図であり、電極や絶縁膜等を透過し、半導体領域のみが表現されている。
本実施形態がもたらす効果は、第1実施形態と同様に、広域ウェル領域31の一部を欠損させることで形成したSBDから流れるユニポーラ電流が、広域ウェル領域31とドリフト層20とからなるpn接合にかかる順方向電圧を低減することにある。また、このpnダイオードが動作した際に、その電流が流れる経路となる、外周側の広域ウェル領域31内に配置されたオーミック電極70と第2ウェルコンタクト領域36との間の金属層と半導体層との接触抵抗を高め、この部分での電圧降下を増大させることで、pnダイオードに流れる電流をさらに低減することにある。
<構成>
図13は、活性領域の終端部分のうち、ゲート電極82に隣接する箇所の構造を説明する図であり、図3のa−a’の位置に相当する断面模式図である。
本実施形態によれば、ウェル領域30上に形成された第1絶縁膜としてのゲート絶縁膜50の膜厚よりも、広域ウェル領域31上に形成された第1絶縁膜としてのフィールド絶縁膜52Cの膜厚の方が厚い。
<構成>
本実施形態では、電流センスを内蔵するSBD内蔵MOSFETにおいて、第1実施形態の技術が適用された例を説明する。
本構成がもたらす効果は、センスセルにおいて、pn電流による結晶欠陥の発生を効果的に抑制することにある。この効果は、広域ウェル領域31のうちセンスセル近傍の一部を欠損させる形でSBDダイオードを形成し、そのショットキー電極75を、ソース電極80ではなくセンス電極81に接続することで、SBDダイオードを、よりセンスセルに近づけた配置とできることによって実現される。
<構成>
図18は、活性領域の終端部分のうち、ゲート電極82に隣接する箇所の構造を説明する図であり、図3のa−a’の位置に相当する断面模式図である。
本構成がもたらす効果は、第1実施形態と同様であり、それをさらに顕著にしたものと言える。これは、広域ウェル領域31の一部に形成された第3離間領域23のn型濃度を高めた高濃度領域100Dを形成することで、SBDから流れるユニポーラ電流の導通経路である、第3離間領域23の抵抗を減らし、より多くのユニポーラ電流を流すことによってもたらされる。
<構成>
図21(a)は、活性領域の終端部分のうち、ゲート電極82に隣接する箇所の構造を説明する図であり、図3のa−a’の位置に相当する断面模式図である。また、図21(b)は、図21(a)の箇所の平面模式図であり、電極や絶縁膜等を透過し、半導体領域のみが表現されている。
このような構成によれば、広域ウェル領域31の一部に形成されたSBDダイオードから流れるユニポーラ電流を増やし、隣接する活性領域における結晶欠陥の発生を抑制することができる。その効果を高めるべく、できるだけ多くのSBD電流を流すことを目的としている。
<構成>
図25は、活性領域の終端部分のうち、ゲート電極82に隣接する箇所の構造を説明する図であり、図3のa−a’の位置に相当する平面模式図であり、電極や絶縁膜等を透過し、半導体領域のみが表現されている。同様に、図26は、活性領域の終端部分のうち、ゲート電極82が存在せず、チップ終端部分に隣接する箇所の構造を説明する図であり、図3のb−b’の位置に相当する断面模式図である。
本構成がもたらす効果は2つあり、そのうち1つ目の効果は、第1実施形態と同様であり、それをさらに顕著にしたものと言える。これは、第3離間領域23aの形状のうち、X方向の寸法を大きくすることで、第3離間領域23aの面積を増やし、より多くのユニポーラ電流を流すことによってもたらされる。2つ目の効果は、第3離間領域23aの面積を増やす場合に、Y方向を大きくしたときに生じるデメリットを避けることにある。
上記実施形態では、n型(第1導電型)不純物として窒素を用いたが、リンまたはヒ素であってもよい。
Claims (14)
- 第1導電型の半導体基板(10)上に形成された、第1導電型のドリフト層(20)と、
前記ドリフト層(20)表層において互いに離間して複数設けられた、第2導電型の第1ウェル領域(30)と、
前記ドリフト層(20)表層において複数の前記第1ウェル領域(30)全体を平面視上挟んで形成された、各前記第1ウェル領域(30)よりも形成面積が広い第2導電型の第2ウェル領域(31)と、
各前記第1ウェル領域(30)内において、各前記第1ウェル領域(30)表層から深さ方向に貫通して形成された第1導電型の第1離間領域(22)と、
各前記第1ウェル領域(30)表層において、平面視上前記第1離間領域(22)を挟んで形成された第1導電型のソース領域(40)と、
前記第1離間領域(22)上に設けられた第1ショットキー電極(75)と、
各前記第1ウェル領域(30)上において、平面視上前記第1ショットキー電極(75)を挟んで設けられた第1オーミック電極(70)と、
各前記第1ウェル領域(30)を互いに離間させる領域である第1導電型の第2離間領域(21)と、
前記第2ウェル領域(31)内において、前記第2ウェル領域(31)表層から深さ方向に貫通して形成された第1導電型の第3離間領域(23)と、
前記第3離間領域(23)上に設けられた第2ショットキー電極(75)と、
前記第1および第2ショットキー電極(75)と、前記第1オーミック電極(70)とが設けられた位置を除く前記第1および第2ウェル領域(30、31)上に亘って、第1絶縁膜(50)を介して設けられたゲート電極(60)と、
前記ゲート電極(60)を覆って形成された第2絶縁膜(55)と、
前記第1および第2ショットキー電極(75)と、前記第1オーミック電極(70)と、前記第2絶縁膜(55)とを覆って設けられた第1ソース電極(80)とを備えることを特徴とする、
半導体装置。 - 前記第2ウェル領域(31)上において、前記第1ウェル領域(30)に隣接する位置に設けられた第2オーミック電極(70)をさらに備え、
前記ゲート電極(60)が、前記第2オーミック電極(70)が設けられた位置も除いて設けられ、
前記第1ソース電極(80)が、前記第2オーミック電極(70)も覆って設けられていることを特徴とする、
請求項1に記載の半導体装置。 - 前記第3離間領域(23)が、前記第2オーミック電極(70)よりも前記第1ウェル領域(30)から遠ざかる位置に形成されていることを特徴とする、
請求項2に記載の半導体装置。 - 前記第2オーミック電極(70)が、前記第2ショットキー電極(75)を平面視上挟む位置に設けられていることを特徴とする、
請求項2に記載の半導体装置。 - 前記第1絶縁膜(50、52C)が、前記第1ウェル領域(30)上に形成された膜厚よりも、前記第2ウェル領域(31)上に形成された膜厚の方が厚いことを特徴とする、
請求項2から4のうちのいずれか1項に記載の半導体装置。 - 前記第2オーミック電極(70)における接触抵抗が、前記第1オーミック電極(70)における接触抵抗よりも高いことを特徴とする、
請求項2から5のうちのいずれか1項に記載の半導体装置。 - 前記第1ウェル領域(30)表層の、前記第1オーミック電極(70)が設けられた位置に形成された第2導電型の第1ウェルコンタクト領域(35)をさらに備えることを特徴とする、
請求項2から6のうちのいずれか1項に記載の半導体装置。 - 前記第2ウェル領域(31)表層の、前記第2オーミック電極(70)が設けられた位置に形成された第2導電型の第2ウェルコンタクト領域(36)とをさらに備え、
前記第2ウェルコンタクト領域(36)の不純物濃度が、前記第1ウェルコンタクト領域(35)の不純物濃度より低いことを特徴とする、
請求項7に記載の半導体装置。 - 複数の前記第1ウェル領域(30)のうちの少なくとも1つにおいて、当該第1ウェル領域(30)における前記第1離間領域(22)上に形成された前記第1ショットキー電極(75)、および、当該第1ウェル領域(30)上において前記第1ショットキー電極(75)を挟んで形成された前記第1オーミック電極(70)を覆って設けられた、前記第1ソース電極(80)とは異なる第2ソース電極(81)をさらに備えることを特徴とする、
請求項1から8のうちのいずれか1項に記載の半導体装置。 - 前記第3離間領域(23)内に部分的に形成された、第2導電型の補助領域(33a、33b、33c)をさらに備えることを特徴とする、
請求項1から9のうちのいずれか1項に記載の半導体装置。 - 前記第3離間領域(23)の第1導電型の不純物濃度が、前記ドリフト層(20)における第1導電型の不純物濃度よりも高いことを特徴とする、
請求項1から10のうちのいずれか1項に記載の半導体装置。 - 前記ドリフト層(20)が、炭化珪素からなることを特徴とする、
請求項1から11のうちのいずれか1項に記載の半導体装置。 - 前記第2オーミック電極(70)の平面位置と前記第3離間領域(23)の平面位置との間の前記ドリフト層(20)表面における距離が、前記ドリフト層(20)の膜厚分よりも短いことを特徴とする、
請求項2から8のうちのいずれか1項に記載の半導体装置。 - 前記第3離間領域(23a)の、前記第2ウェル領域(31)が前記第1ウェル領域(30)を挟む方向の寸法が、前記第3離間領域(23a)の、前記第2ウェル領域(31)が前記第1ウェル領域(30)を挟む方向と垂直な方向の寸法よりも大きいことを特徴とする、
請求項1から13のうちのいずれか1項に記載の半導体装置。
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JPH04364079A (ja) | 1991-06-11 | 1992-12-16 | Fuji Electric Co Ltd | 半導体装置 |
JP3491049B2 (ja) | 1995-10-11 | 2004-01-26 | 富士電機ホールディングス株式会社 | 整流素子およびその駆動方法 |
JP2002373989A (ja) | 2001-06-13 | 2002-12-26 | Toshiba Corp | 半導体装置 |
JP2003017701A (ja) | 2001-07-04 | 2003-01-17 | Denso Corp | 半導体装置 |
JP4066946B2 (ja) | 2003-12-18 | 2008-03-26 | 日産自動車株式会社 | 半導体装置 |
US7952139B2 (en) * | 2005-02-11 | 2011-05-31 | Alpha & Omega Semiconductor Ltd. | Enhancing Schottky breakdown voltage (BV) without affecting an integrated MOSFET-Schottky device layout |
JP4900662B2 (ja) | 2006-03-02 | 2012-03-21 | 独立行政法人産業技術総合研究所 | ショットキーダイオードを内蔵した炭化ケイ素mos電界効果トランジスタおよびその製造方法 |
US8217419B2 (en) | 2007-06-15 | 2012-07-10 | Rohm Co., Ltd. | Semiconductor device |
DE102007052202B3 (de) * | 2007-10-30 | 2008-11-13 | Infineon Technologies Austria Ag | Halbleiterbauelement und Verfahren zur Herstellung desselben |
KR101269795B1 (ko) * | 2008-12-25 | 2013-05-30 | 미쓰비시덴키 가부시키가이샤 | 전력용 반도체 장치 |
DE112009005069B4 (de) * | 2009-07-15 | 2016-09-01 | Mitsubishi Electric Corporation | Leistungshalbleitervorrichtung und verfahren zum herstellen einer leistungshalbleitervorrichtung |
US20110156810A1 (en) | 2009-12-30 | 2011-06-30 | Intersil Americas Inc. | Integrated dmos and schottky |
WO2012001837A1 (ja) * | 2010-06-30 | 2012-01-05 | 三菱電機株式会社 | 電力用半導体装置 |
US8735968B2 (en) * | 2010-12-28 | 2014-05-27 | Monolithic Power Systems, Inc. | Integrated MOSFET devices with Schottky diodes and associated methods of manufacturing |
JP2012234848A (ja) | 2011-04-28 | 2012-11-29 | Sanken Electric Co Ltd | 半導体装置 |
JP5919121B2 (ja) * | 2011-07-27 | 2016-05-18 | 株式会社豊田中央研究所 | ダイオードおよび半導体装置 |
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DE112014001838T5 (de) | 2015-12-17 |
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