JP7442932B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7442932B2 JP7442932B2 JP2020039544A JP2020039544A JP7442932B2 JP 7442932 B2 JP7442932 B2 JP 7442932B2 JP 2020039544 A JP2020039544 A JP 2020039544A JP 2020039544 A JP2020039544 A JP 2020039544A JP 7442932 B2 JP7442932 B2 JP 7442932B2
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- 239000004065 semiconductor Substances 0.000 title claims description 77
- 239000010410 layer Substances 0.000 claims description 164
- 239000012535 impurity Substances 0.000 claims description 26
- 239000011229 interlayer Substances 0.000 claims description 5
- 239000000758 substrate Substances 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005468 ion implantation Methods 0.000 description 4
- 230000003213 activating effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
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Description
図12は、関連技術による半導体装置であるIGBTの構成の一例を示す断面図である。図12に示すように、関連技術による半導体装置は、第1主面および第2主面を有する半導体基板1と、半導体基板1の第1主面に設けられた層間絶縁膜11およびエミッタ電極13と、半導体基板1の第2主面に設けられたコレクタ電極5とを備えている。
図5は、実施の形態2による半導体装置であるIGBTの構成の一例を示す断面図である。図5に示すように、実施の形態2による半導体装置は、ダミートレンチ15、ダミーゲート絶縁膜16、およびダミーゲート電極17を備えることを特徴としている。その他の構成は、実施の形態1による半導体装置と同様であるため、ここでは詳細な説明を省略する。
図6は、実施の形態3による半導体装置であるIGBTの構成の一例を示す断面図である。図6に示すように、実施の形態3による半導体装置は、電力半導体領域であるIGBT領域とダイオード領域とを有し、ダイオード領域ではダイオードトレンチ18、アノード層19、およびカソード層20を備えることを特徴としている。IGBT領域の構成は、実施の形態2による半導体装置の構成と同様であるため、ここでは説明を省略する。なお、図6の例では、IGBT領域の構成は、実施の形態2による半導体装置の構成と同様である場合を示しているが、これに限るものではない。IGBT領域は、実施の形態1による半導体装置の構成と同様であってもよい。
図7は、実施の形態4による半導体装置であるIGBTの構成の一例を示す断面図である。図7に示すように、実施の形態4による半導体装置は、アクティブトレンチ8内にアクティブゲート絶縁膜9を介してアクティブゲート電極10およびシールド電極21が埋め込まれていることを特徴としている。その他の構成は、実施の形態3と同様であるため、ここでは説明を省略する。なお、図7の例では、実施の形態3による半導体装置に実施の形態4の特徴を適用する場合を示しているが、これに限るものではない。実施の形態4の特徴は、実施の形態1または実施の形態2による半導体装置に適用してもよい。
図8は、実施の形態5による半導体装置であるIGBTの構成の一例を示す平面図である。図8に示すように、実施の形態5による半導体装置は、平面視において、エミッタ層7および第2導電型のコンタクト層22は、線状に配置されたアクティブトレンチ8に対して直交して延在し、かつ交互に配置されている。また、コンタクトホール12は、アクティブトレンチ8に対して平行に配置されている。その他の構成は、実施の形態1~4のいずれかと同様であるため、ここでは説明を省略する。
実施の形態1~5で説明した半導体装置に限らず、本開示は様々な展開が可能である。例えば、素子構造としては、IGBTだけでなく、MOSFET(Metal Oxide Semiconductor Field Effect Transistor)、RC-IGBTなどのパワーデバイスに適用することが可能である。また、耐圧クラスおよび基板の種別に限定することなく適用することが可能である。ここで、基板の種別としては、例えばFZ(Floating Zone)基板、MCZ(Magnetic Czochralski)基板、およびエピ基板等が挙げられる。
Claims (7)
- 第1導電型のドリフト層と、
前記ドリフト層の第1主面側に設けられた前記第1導電型のキャリアストア層と、
前記キャリアストア層の前記第1主面側に設けられた第2導電型のベース層と、
前記ベース層の前記第1主面側に設けられた前記第1導電型のエミッタ層と、
前記エミッタ層、前記ベース層、および前記キャリアストア層を貫通して前記ドリフト層に達するように設けられたトレンチと、
前記トレンチの内壁に設けられたゲート絶縁膜と、
前記トレンチ内に前記ゲート絶縁膜を介して埋め込まれたゲート電極と、
前記ドリフト層の第2主面側に設けられた前記第2導電型のコレクタ層と、
を備え、
前記ベース層における不純物のピーク濃度は1.0E17cm-3以上かつ2.0E17cm-3以下であり、
前記ゲート絶縁膜の厚さは、40nm以上60nm以下である、半導体装置。 - 前記ベース層の厚さは、前記エミッタ層と前記ベース層との境界から前記ベース層と前記キャリアストア層との境界までの距離で定義された1.5μm以下である、請求項1に記載の半導体装置。
- 前記ベース層における不純物の最低濃度は、前記ドリフト層における不純物濃度の1.5倍以上である、請求項1または2に記載の半導体装置。
- 前記エミッタ層、前記ベース層、および前記キャリアストア層を貫通して前記ドリフト層に達するように設けられた複数のダミートレンチと、
各前記ダミートレンチの内壁に設けられたダミーゲート絶縁膜と、
各前記ダミートレンチ内に前記ダミーゲート絶縁膜を介して埋め込まれたダミーゲート電極と、
前記ダミートレンチ間のメサ領域の上部に設けられた層間絶縁膜と、
をさらに備え、
前記メサ領域の電位はフローティングである、請求項1から3のいずれか1項に記載の半導体装置。 - 電力半導体領域とダイオード領域とを有し、
前記電力半導体領域は、少なくとも前記ドリフト層、前記キャリアストア層、前記ベース層、前記エミッタ層、前記トレンチ、前記ゲート絶縁膜、および前記コレクタ層を有し、
前記ダイオード領域は、
前記ドリフト層の前記第1主面側に設けられた前記第2導電型のアノード層と、
前記アノード層を貫通して前記ドリフト層に達するように設けられたダイオードトレンチと、
前記ドリフト層の前記第2主面側に設けられた前記第1導電型のカソード層と、
を有し、
前記カソード層の端部と前記エミッタ層の端部との距離は0以上である、請求項1から4のいずれか1項に記載の半導体装置。 - 前記トレンチ内には、前記ゲート絶縁膜を介して前記ゲート電極およびシールド電極が埋め込まれ、
前記ゲート電極は、断面視において、底部が前記キャリアストア層に相当する位置に存在し、
前記シールド電極は、断面視において、上部が前記キャリアストア層に相当する位置に存在し、底部が前記ドリフト層に相当する位置に存在する、請求項1から5のいずれか1項に記載の半導体装置。 - 平面視において、前記エミッタ層および前記第2導電型のコンタクト層は、線状に配置された前記トレンチに対して直交して延在し、かつ交互に配置され、
前記エミッタ層の延在方向に対して直交する方向の幅は、1.0μm以下である、請求項1から6のいずれか1項に記載の半導体装置。
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