JP2014116482A - 半導体装置 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 146
- 239000000758 substrate Substances 0.000 claims abstract description 46
- 239000013078 crystal Substances 0.000 claims description 42
- 230000007547 defect Effects 0.000 claims description 42
- 210000000746 body region Anatomy 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 9
- 239000000969 carrier Substances 0.000 description 10
- 238000011084 recovery Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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Abstract
【解決手段】半導体装置10は、ダイオード領域20とIGBT領域50とが形成されている半導体基板11を備える。半導体基板11のダイオード領域20は、半導体基板11の表面に臨む範囲の一部に形成されたn型の特定半導体領域22と、半導体基板11の表面に臨む範囲の他の部分に形成されるとともに特定半導体領域22の下側に亘って形成されているp型のアノード領域24と、アノード領域24の下側に形成されるn型のダイオードドリフト領域26とを有している。特定半導体領域22は、アノード領域24によってダイオードドリフト領域26と分離されており、トレンチゲート電極16と電気的に接続している。
【選択図】図2
Description
図1に示すように、本実施例の半導体装置10は、主にSiからなる半導体基板11と、半導体基板11の表裏面に形成されている絶縁層、電極、金属配線等(図示しない)によって構成されている。半導体基板11には、IGBT(Insulated Gate Bipolar Transistor)領域50とダイオード領域20が形成されている。本実施例では、半導体基板11の表面(図1の上面)全面に亘って表面電極(図示省略)が形成され、半導体基板11の裏面(図1の下面)全面に亘って裏面電極(図示省略)が形成されている。
次いで、図3、図4を参照して、第2実施例の半導体装置100について、第1実施例と異なる点を中心に説明する。本実施例の半導体装置100では、ダイオード領域120の構造が第1実施例とは異なる。本実施例では、図3に示すように、2個の特定半導体領域122が、それぞれ、ダミートレンチ42を挟んで対向しない位置に形成されている。
次いで、図5、図6を参照して、第3実施例の半導体装置200について、第1実施例と異なる点を中心に説明する。本実施例の半導体装置200は、まず、2本のゲートトレンチ12の間に、ダミートレンチが形成されていない点で第1実施例とは異なる。それに伴い、ダイオード領域220の構造も、第1実施例とは異なっている。即ち、図5に示すように、本実施例では、1個の特定半導体領域222が2本のゲートトレンチ12の間に形成されている。
11:半導体基板
12:ゲートトレンチ
14:ゲート絶縁膜
16:トレンチゲート電極
20:ダイオード領域
22:特定半導体領域
24:アノード領域
24a:第1アノード領域
24b:第2アノード領域
26:ダイオードドリフト領域
30:結晶欠陥領域
42:ダミートレンチ
44:ダミー絶縁膜
46:ダミー電極
50:IGBT領域
52:エミッタ領域
54:ボディ領域
56:IGBTドリフト領域
58:コレクタ領域
70:空乏層
100:半導体領域
120:ダイオード領域
122:特定半導体領域
200:半導体領域
220:ダイオード領域
222:特定半導体領域
Claims (4)
- ダイオード領域とIGBT領域とが形成されている半導体基板を備える半導体装置であって、
半導体基板のIGBT領域は、半導体基板の表面に臨む範囲に形成された第1導電型のエミッタ領域と、エミッタ領域の下側に形成される第2導電型のボディ領域と、ボディ領域の下側に形成される第1導電型のIGBTドリフト領域と、半導体基板の表面からIGBTドリフト領域にまで伸びるゲートトレンチと、エミッタ領域に接すると共にゲートトレンチの内壁を被覆するゲート絶縁膜と、そのゲート絶縁膜内に配置されたトレンチゲート電極とを有しており、
半導体基板のダイオード領域は、半導体基板の表面に臨む範囲の一部に形成された第1導電型の特定半導体領域と、半導体基板の表面に臨む範囲の他の部分に形成されるとともに特定半導体領域の下側に亘って形成されている第2導電型のアノード領域と、アノード領域の下側に形成される第1導電型のダイオードドリフト領域を有しており、
特定半導体領域は、アノード領域によってダイオードドリフト領域と分離されており、トレンチゲート電極と電気的に接続している、
ことを特徴とする半導体装置。 - ゲートトレンチと、ゲート絶縁膜と、トレンチゲート電極は、IGBT領域とダイオード領域とに亘って形成されており、
特定半導体領域は、ダイオード領域内のゲート絶縁膜と隣接しない範囲に形成されている、
ことを特徴とする請求項1に記載の半導体装置。 - アノード領域は、半導体基板の表面に臨む範囲の他の部分の少なくとも一部に形成される第1アノード領域と、第1アノード領域の下側に形成される第2アノード領域を有しており、
第1アノード領域の第2導電型の不純物濃度は、第2アノード領域の第2導電型の不純物濃度よりも高く、
特定半導体領域の下端部の位置は、第1アノード領域の下端部の位置よりも下方にある、
ことを特徴とする請求項1又は2に記載の半導体装置。 - ダイオードドリフト領域には、結晶欠陥領域が形成されており、
結晶欠陥領域における結晶欠陥密度は、ダイオードドリフト領域の結晶欠陥領域以外の領域における結晶欠陥密度よりも高い、
ことを特徴とする請求項1から3のいずれか一項に記載の半導体装置。
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JP2012270003A JP5700028B2 (ja) | 2012-12-11 | 2012-12-11 | 半導体装置 |
US14/091,954 US8921889B2 (en) | 2012-12-11 | 2013-11-27 | Semiconductor device |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6461956A (en) * | 1987-08-26 | 1989-03-08 | Siliconix Inc | Semiconductor device |
JP2009267116A (ja) * | 2008-04-25 | 2009-11-12 | Toyota Motor Corp | ダイオードとそのダイオードを備えている半導体装置 |
JP2011100762A (ja) * | 2009-11-04 | 2011-05-19 | Toyota Motor Corp | 半導体装置の製造方法 |
JP2011238975A (ja) * | 2011-08-29 | 2011-11-24 | Toyota Motor Corp | 半導体装置とその半導体装置を備えている給電装置の駆動方法 |
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JP4843253B2 (ja) * | 2005-05-23 | 2011-12-21 | 株式会社東芝 | 電力用半導体装置 |
US8507352B2 (en) * | 2008-12-10 | 2013-08-13 | Denso Corporation | Method of manufacturing semiconductor device including insulated gate bipolar transistor and diode |
JP2011129619A (ja) | 2009-12-16 | 2011-06-30 | Toyota Motor Corp | 半導体装置の製造方法 |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6461956A (en) * | 1987-08-26 | 1989-03-08 | Siliconix Inc | Semiconductor device |
JP2009267116A (ja) * | 2008-04-25 | 2009-11-12 | Toyota Motor Corp | ダイオードとそのダイオードを備えている半導体装置 |
JP2011100762A (ja) * | 2009-11-04 | 2011-05-19 | Toyota Motor Corp | 半導体装置の製造方法 |
JP2011238975A (ja) * | 2011-08-29 | 2011-11-24 | Toyota Motor Corp | 半導体装置とその半導体装置を備えている給電装置の駆動方法 |
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US20140159109A1 (en) | 2014-06-12 |
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