JP5815882B2 - 半導体装置 - Google Patents
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- JP5815882B2 JP5815882B2 JP2014534155A JP2014534155A JP5815882B2 JP 5815882 B2 JP5815882 B2 JP 5815882B2 JP 2014534155 A JP2014534155 A JP 2014534155A JP 2014534155 A JP2014534155 A JP 2014534155A JP 5815882 B2 JP5815882 B2 JP 5815882B2
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 17
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 16
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Description
まず、この発明の実施の形態1における半導体装置の構成を説明する。図1は、この発明の実施の形態1に係る半導体装置を示す断面図であり、SBD(Schottky Barrier Diode)内蔵MOSFETのユニットセルの断面模式図である。図2は、本実施の形態の前記半導体装置の一部を上から見た図であり、図1の電極や絶縁膜などを透過し、半導体領域のみを表現している。本実施の形態においては、半導体装置の一例として、炭化珪素(SiC)半導体装置であり、第1導電型をn型、第2導電型をp型としたnチャネル炭化珪素MOSFETについて説明する。
図5は、本発明の実施の形態2における半導体装置の第一離間領域22内にある第1の領域の不純物濃度プロファイルの一例を示す図である。実施の形態2は、第1の領域内のn型不純物濃度NNdを、表面から浅い領域より深い領域で高くしたことを特徴とする。それ以外については、実施の形態1と同様である。
図10は、本発明の実施の形態3における半導体装置の断面図である。図10において、太い破線で囲まれ第一離間領域22と等しい領域が第1の領域である。本実施の形態3では、さらに、第一離間領域22の直下にあり太い点線で囲まれる領域を第2の領域と呼び、ウェル領域30の直下にあり太い一点鎖線で囲まれる領域を第3の領域と呼ぶ。本実施の形態3は、第一離間領域22の第1の領域の不純物濃度のみならず第一の領域の下部の第2の領域及びウェル領域30の直下の第3の領域のn型(第1導電型)不純物濃度を、ドリフト層20の第1の不純物濃度に対して高めたことを特徴とする。それ以外については、実施の形態1または2と同様である。
図14は、本発明の実施の形態4における半導体装置の断面図である。本実施の形態は、第一離間領域22の表面からウェル領域30より浅い一定の深さ領域を第1の領域とし、ドリフト層20の第1の不純物濃度に対して高めたことを特徴とする。それ以外については、実施の形態1、2または3と同様である。
図16は、本発明の実施の形態5における半導体装置の断面図である。実施の形態5は、第一離間領域22の不純物濃度をドリフト層20の第1の不純物濃度に対して高くして第1の領域とし、かつ第二離間領域21の不純物濃度をドリフト層20の第1の不純物濃度に対して高く設定していることを特徴とする。それ以外については、実施の形態1〜4と同様である。
図17は、本発明の実施の形態6における半導体装置の断面図である。実施の形態6は、図17に断面図を示すように、実施の形態1で存在した第1の領域を含む第一離間領域22を第二離間領域21に包含させ、第二離間領域21上にショットキー電極75を形成することを特徴とする。本実施の形態では、第一離間領域22が第二離間領域21に包含される。言いかえれば、実施の形態1〜5においては、1つのユニットセル内において、断面視で2つのウェル領域30を第一離間領域22が離間していたが、本実施の形態においては、隣接するユニットセルに跨って、断面視で2つのウェル領域30を第二離間領域21に包含された第一離間領域22が離間する。それ以外については、実施の形態1〜5と同様である。
図18は、本発明の実施の形態7における半導体装置の断面図である。本実施の形態7は、半導体装置がトレンチ型MOSFETであることを特徴とし、それ以外については実施の形態1〜4と同様である。
Claims (17)
- 第1導電型の第1の不純物濃度を有するドリフト層と、
前記ドリフト層の表層側に、互いに離間するように設けられた第2導電型の第2の不純物濃度を有する複数のウェル領域と、
前記ドリフト層の表面上に設けられ、ソースオーミック電極と電気的に接続されるショットキー電極と、
隣り合う前記ウェル領域の間で、かつ前記ショットキー電極の下部に設けられ、前記第1の不純物濃度より高く、前記第2の不純物濃度より低い第1導電型の不純物濃度を有する第1の領域と
を備えた半導体装置。 - 第1導電型の第1の不純物濃度を有するドリフト層と、
前記ドリフト層の表層側に、互いに離間するように設けられた第2導電型の第2の不純物濃度を有する複数のウェル領域と、
前記ドリフト層の表面上に設けられ、ソースオーミック電極と電気的に接続されるショットキー電極と、
隣り合う前記ウェル領域の間で、かつ前記ショットキー電極の下部に第1の領域と
を備え、
前記第1の領域内のある深さにおける第1導電型の不純物濃度が、同じ深さにおける前記ウェル領域内の前記第2の不純物濃度より低く、かつ前記第1の不純物濃度より高いこと
を特徴とする半導体装置。 - 前記第1の領域内の第1導電型の不純物濃度が、前記ショットキー電極と前記ドリフト層の接合界面に向かい減衰する濃度プロファイルであること
を特徴とする請求項1または2に記載の半導体装置。 - 前記第1の領域が、表面より深い領域から、前記ウェル領域の底部と等しい深さまで形成されていること
を特徴とする請求項1から3のいずれか1項に記載の半導体装置。 - 前記第1の領域が、表面から、前記ウェル領域の底部と等しい深さまでか、前記ウェル領域の底部より浅い深さまで形成されていること
を特徴とする請求項1から3のいずれか1項に記載の半導体装置。 - 前記第1の領域の下部に形成された第1導電型の第2の領域を備え、
前記第2の領域の第1導電型の不純物濃度が、前記第1の不純物濃度より高いこと
を特徴とする請求項1から5のいずれか1項に記載の半導体装置。 - 前記ウェル領域の少なくとも一部の直下に、第1導電型の第3の領域を備え、
前記第3の領域の第1導電型の不純物濃度が、前記第1の不純物濃度より高いこと
を特徴とする請求項1から6のいずれか1項に記載の半導体装置。 - 前記第1の領域を含み、前記ショットキー電極が表面の少なくとも一部に形成された、
隣り合う前記ウェル領域間の第1導電型の第一離間領域と、
前記半導体装置がオン状態の時にオン電流が流れる経路にある、隣り合う前記ウェル領域間の第1導電型の第二離間領域と
を備えた請求項1から7のいずれか1項に記載の半導体装置。 - 前記第二離間領域の第1導電型の不純物濃度が、前記第1の不純物濃度より高いこと
を特徴とする請求項8に記載の半導体装置。 - 前記第1の領域の第1導電型の不純物濃度と、前記第二離間領域の第1導電型の不純物濃度が等しいこと
を特徴とする請求項8に記載の半導体装置。 - 前記第二離間領域に、前記第一離間領域が含まれること
を特徴とする請求項8に記載の半導体装置。 - 前記ソースオーミック電極と前記ショットキー電極が連続して形成されていること
を特徴とする請求項1から11のいずれか1項に記載の半導体装置。 - 前記ウェル領域内に形成された第1導電型のソース領域と、
前記ウェル領域内に形成され、前記ソース領域と隣接する第2導電型のウェルコンタクト領域と
を備え、
前記ソースオーミック電極は、前記ソース領域の表面と前記ウェルコンタクト領域の表面の、少なくとも一部に形成されたこと
を特徴とする請求項1から12のいずれか1項に記載の半導体装置。 - 前記ウェル領域と前記ソース領域の一部との表面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、前記ウェル領域と前記ソース領域の端部と対向するように形成されたゲート電極と、
前記ドリフト層が表面に形成される半導体基板と、
前記半導体基板の裏面にドレイン電極と
を備えた請求項13に記載の半導体装置。 - 前記半導体装置がnチャネル炭化珪素MOSFETであること
を特徴とする請求項1から14のいずれか1項に記載の半導体装置。 - 前記ソースオーミック電極と前記ショットキー電極は別材料で構成されていること
を特徴とする請求項1から15のいずれか1項に記載の半導体装置。 - 前記ソースオーミック電極はシリサイドを有し、
前記ショットキー電極はTi、Mo、Niのいずれかを有すること
を特徴とする請求項1から16のいずれか1項に記載の半導体装置。
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