JP2021082725A - 半導体装置 - Google Patents
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Abstract
Description
図1は、本発明の実施の形態1に係る半導体装置であるIGBTの平面模式図である。また、図2は、当該半導体装置の一部の断面模式図であり、図1に示すA−A線に沿った断面を示している。ここではIGBTの例としてトレンチゲート型のIGBTを示すが、IGBTは平面ゲート型のIGBTでもよい。また、以下の説明では、第1導電型をn型、第2導電型をp型として説明するが、それとは逆に、第1導電型をp型、第2導電型をn型としてもよい。
式(A)において、Vp+nはIGBTのpコレクタ層4とnベース層1との間のpn接合(J1接合)の電圧降下であり、VNBはnベース層1の電圧降下であり、VMOSFETはIGBT内のMOFET部の電圧降下(nエミッタ層3およびnチャネルからなる経路の電圧降下)である。
図4は、実施の形態2に係る半導体装置であるIGBTの断面模式図である。実施の形態2に係る半導体装置は、図2の構成に対し、nベース層1とpベース層2の間に、nベース層1よりも不純物のピーク濃度が高い第1導電型の第5半導体領域であるキャリア蓄積層(CS層)14を設けたものである。キャリア蓄積層14以外の構成は、図2と同様であるため、ここではそれらの説明は省略する。
図6は、実施の形態3に係る半導体装置であるIGBTの断面模式図である。実施の形態3に係る半導体装置は、図2の構成に対し、nベース層1とpコレクタ層4との間に、nベース層1よりも不純物のピーク濃度が高い第1導電型の第6半導体領域であるバッファ層15を設けたものである。バッファ層15以外の構成は、図2と同様であるため、ここではそれらの説明は省略する。
上述したように、IGBTセル20の密度を小さくして、J2接合の面積が小さくすると、nベース層1の正孔の蓄積が増えて、VNBを小さくできる。言い換えれば、IGBTセル20のメサ部6の幅(2S)を小さくすることは、VNBを小さくするのに有効である。しかし、IGBTセル20のメサ部6の幅を狭め過ぎると、エミッタ電極10とnエミッタ層3の接触面積が小さくなり、その接触抵抗が増大してオン電圧を増大させる原因となる。実施の形態4では、IGBTセル20のメサ部6の幅の好ましい範囲について説明する。
図10は、実施の形態5に係る半導体装置である両面ゲート構造IGBTの断面模式図である。実施の形態5に係る半導体装置も、実施の形態1と同様に、nベース層1、pベース層2、nエミッタ層3およびpコレクタ層4が形成された半導体層100を用いて形成されている。
図11は、実施の形態6に係る半導体装置であるIGBTの断面模式図である。図2のIGBTにおいては、隣り合うIGBTセル20同士の間隔を一定としたが、その間隔は一定でなくてもよい。例えば、図11のIGBTは、隣り合うIGBTセル20同士の間にIGBTセル20が設けられた部分と、隣り合うIGBTセル20同士が直接並んだ部分とが存在する。ただし、IGBTセル20は周期的(規則的)な繰り返しパターンで配列されているものとする。
Claims (8)
- 第1主面および第2主面を有する半導体層と、
前記半導体層に形成された複数のIGBTセルと、
を備える半導体装置であって、
前記複数のIGBTセルのそれぞれは、
前記半導体層に形成された第1導電型の第1半導体領域と、
前記第1半導体領域の前記第1主面側の表層部に形成された第2導電型の第2半導体領域と、
前記第2半導体領域の表層部に形成された第1導電型の第3半導体領域と、
前記半導体層の前記第2主面側の表層部に形成された第2導電型の第4半導体領域と、
前記半導体層の前記第1主面上に形成されたゲート絶縁膜と、
前記ゲート絶縁膜を介して前記第1半導体領域、前記第2半導体領域および前記第3半導体領域に向かい合うように形成されたゲート電極と、
前記半導体層の前記第1主面上に形成され、前記第2半導体領域および前記第3半導体領域に接続した第1主電極と、
前記半導体層の前記第2主面上に形成され、前記第4半導体領域に接続した第2主電極と、
を備え、
前記複数のIGBTセルのピッチが、前記第2半導体領域と前記第4半導体領域との間の距離の40分の1以上20分の1以下である、
半導体装置。 - 第1主面および第2主面を有する半導体層と、
前記半導体層に形成された複数のIGBTセルと、
を備える半導体装置であって、
前記複数のIGBTセルのそれぞれは、
前記半導体層に形成された第1導電型の第1半導体領域と、
前記第1半導体領域の前記第1主面側の表層部に形成された第2導電型の第2半導体領域と、
前記第2半導体領域の表層部に形成された第1導電型の第3半導体領域と、
前記半導体層の前記第2主面側の表層部に形成された第2導電型の第4半導体領域と、
前記第1半導体領域と前記第2半導体領域の間に配設され、前記第1半導体領域よりも不純物のピーク濃度が高い第1導電型の第5半導体領域と、
前記半導体層の前記第1主面上に形成されたゲート絶縁膜と、
前記ゲート絶縁膜を介して前記第1半導体領域、前記第2半導体領域および前記第3半導体領域に向かい合うように形成されたゲート電極と、
前記半導体層の前記第1主面上に形成され、前記第2半導体領域および前記第3半導体領域に接続した第1主電極と、
前記半導体層の前記第2主面上に形成され、前記第4半導体領域に接続した第2主電極と、
を備え、
前記複数のIGBTセルのピッチが、前記第2半導体領域と前記第4半導体領域との間の距離の50分の1以上20分の1以下である、
半導体装置。 - 前記IGBTセル同士の間に配設され、IGBTとして動作しないダミーセルをさらに備える、
請求項1または請求項2に記載の半導体装置。 - 前記半導体層は、前記第3半導体領域および前記第2半導体領域を貫通して、前記第1半導体領域に達するトレンチを備え、
前記ゲート絶縁膜は、前記トレンチの内面に形成されており、
前記ゲート電極は、前記トレンチに埋め込まれている、
請求項1から請求項3のいずれか一項に記載の半導体装置。 - 前記複数のIGBTセルのそれぞれにおいて、
前記トレンチに挟まれた前記半導体層のメサ部の幅が、0.4μm以上1μm以下である、
請求項4に記載の半導体装置。 - 前記複数のIGBTセルは、周期的な繰り返しパターンで配列しており、
前記複数のIGBTセルのピッチは、前記繰り返しパターンのピッチを2WC、1つの前記繰り返しパターン内に含まれるIGBTセルの数をCNとすると、2WC/CNとして定義される
請求項1から請求項5のいずれか一項に記載の半導体装置。 - 前記第1半導体領域と前記第4半導体領域との間に配設され、前記第1半導体領域よりも不純物のピーク濃度が高い第1導電型の第6半導体領域をさらに備える、
請求項1から請求項6のいずれか一項に記載の半導体装置。 - 前記第1半導体領域と前記第2主電極との間の導通と非導通とを切り替えることが可能な第2のゲート電極をさらに備える、
請求項1から請求項7のいずれか一項に記載の半導体装置。
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DE102020128882.4A DE102020128882A1 (de) | 2019-11-20 | 2020-11-03 | Halbleitervorrichtung |
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Citations (6)
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JPH11274484A (ja) * | 1998-03-23 | 1999-10-08 | Toshiba Corp | 半導体装置およびその製造方法 |
JP2000200906A (ja) * | 1999-01-07 | 2000-07-18 | Mitsubishi Electric Corp | 電力用半導体装置およびその製造方法 |
WO2002058160A1 (fr) * | 2001-01-19 | 2002-07-25 | Mitsubishi Denki Kabushiki Kaisha | Dispositif a semi-conducteur |
WO2013073623A1 (ja) * | 2011-11-15 | 2013-05-23 | 富士電機株式会社 | 半導体装置および半導体装置の製造方法 |
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JP2000200906A (ja) * | 1999-01-07 | 2000-07-18 | Mitsubishi Electric Corp | 電力用半導体装置およびその製造方法 |
WO2002058160A1 (fr) * | 2001-01-19 | 2002-07-25 | Mitsubishi Denki Kabushiki Kaisha | Dispositif a semi-conducteur |
WO2013073623A1 (ja) * | 2011-11-15 | 2013-05-23 | 富士電機株式会社 | 半導体装置および半導体装置の製造方法 |
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DE102020128882A1 (de) | 2021-05-20 |
US20210151562A1 (en) | 2021-05-20 |
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