JP2017112193A - 半導体装置および半導体装置の製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 170
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 73
- 230000015556 catabolic process Effects 0.000 claims abstract description 65
- 239000000758 substrate Substances 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000012535 impurity Substances 0.000 claims description 79
- 229910052710 silicon Inorganic materials 0.000 claims description 16
- 239000010703 silicon Substances 0.000 claims description 16
- 239000002344 surface layer Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 5
- 239000012212 insulator Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 21
- 238000005468 ion implantation Methods 0.000 description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 230000005684 electric field Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 238000000206 photolithography Methods 0.000 description 6
- 230000008021 deposition Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
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Abstract
【解決手段】半導体装置は、n+型炭化珪素基板1に設けられた、主電流が流れる活性領域101と、活性領域101の周囲を囲む耐圧構造部102と、を備える。半導体装置は、耐圧構造部102に、第1p型領域4と第2p型領域5が設けられ、第1p型領域4は、複数の第3p型領域6を内包し、第2p型領域5は、複数の第4p型領域7を内包する。複数の第3p型領域6の互いの幅および複数の第4p型領域7の互いの幅は、活性領域101から離れるにつれ広くなる構造となっている。
【選択図】図1
Description
本発明にかかる半導体装置は、シリコンよりもバンドギャップが広い半導体(ワイドバンドギャップ半導体)を用いて構成される。実施の形態1においては、ワイドバンドギャップ半導体として例えば炭化珪素(SiC)を用いて作製された炭化珪素半導体装置について、ショットキーダイオード(SBD:Shottoky Barrier Diode)構造を例に説明する。
次に、実施の形態1にかかる炭化珪素半導体装置の製造方法について、例えば600V以上の耐圧クラスのSBD構造の高耐圧ダイオードを作製する場合を例に説明する。
図5は、実施の形態2にかかる炭化珪素半導体装置の構成を示す断面図である。図5に示すように、実施の形態2にかかる炭化珪素半導体装置において、複数の第4p型領域7の中で活性領域101から1個目、つまり活性領域101に最も近い第4p型領域7aの幅は、他の第4p型領域7の幅よりも広い。また、第4p型領域7aは、第1p型領域4と第2p型領域5の境界に形成されている。
次に、実施の形態2にかかる炭化珪素半導体装置の製造方法について説明する。実施の形態2にかかる炭化珪素半導体装置が、実施の形態1と異なる構成は、第4p型領域7aの幅と位置である。このため、複数の第4p型領域7を形成する際のイオン注入用マスクを第4p型領域7aに対応したマスクにすることにより、実施の形態2にかかる炭化珪素半導体装置を製造することができる。
図6は、実施の形態3にかかる炭化珪素半導体装置の構成を示す断面図である。図6に示すように、実施の形態3では、第1p型領域4の中で第3p型領域6と重なっている部分4aの厚さは、第1p型領域4の他の部分よりも厚い。また、第2p型領域5の中で第4p型領域7と重なっている部分5aの厚さは、第2p型領域5の他の部分よりも厚い。つまり、第1p型領域4の中で第3p型領域6と重なっている部分4aは、第1p型領域4の他の部分よりも深い。また、第2p型領域5の中で第4p型領域7と重なっている部分5aは、第2p型領域5の他の部分よりも深い。
次に、実施の形態3にかかる炭化珪素半導体装置の製造方法について説明する。まず、実施の形態1と同様に、n型炭化珪素エピタキシャル層2を形成する工程から、複数の第3p型領域6、複数の第4p型領域7を形成する工程までを順に行う。
2 n型炭化珪素エピタキシャル層
3 p+型領域
4 第1p型領域
5 第2p型領域
6 複数の第3p型領域
7 複数の第4p型領域
7a 1個目の第4p型領域
8 ショットキー電極
9 裏面電極
101 活性領域
102 耐圧構造部
Claims (11)
- シリコンよりもバンドギャップの広い半導体からなる第1導電型の半導体基板と、
前記半導体基板のおもて面に設けられ、シリコンよりもバンドギャップの広い半導体からなり、前記半導体基板より低不純物濃度の第1導電型の半導体堆積膜と、
前記半導体堆積膜の、前記半導体基板のおもて面と反対側の表面層に設けられた金属半導体接合、または金属半導体接合と絶縁体半導体接合の複合構造を含む活性領域と、
前記活性領域の周囲を囲む、前記半導体堆積膜の前記表面層に設けられた耐圧構造部と、
前記活性領域を少なくとも部分的に囲む第1の第2導電型領域と、
前記第1の第2導電型領域を囲む、前記耐圧構造部に設けられた第2の第2導電型領域と、
前記第2の第2導電型領域に内包され、所定間隔を離して設けられ、前記所定間隔は前記活性領域より離れるに従い広くなる、前記第2の第2導電型領域よりも高不純物濃度で、前記第1の第2導電型領域よりも低不純物濃度の複数の幅の等しい第3の第2導電型領域と、
前記第2の第2導電型領域を囲む、前記耐圧構造部に設けられた、前記第2の第2導電型領域よりも低不純物濃度の第4の第2導電型領域と、
前記第4の第2導電型領域に内包され、所定間隔を離して設けられ、前記所定間隔は前記活性領域より離れるに従い広くなる、前記第4の第2導電型領域よりも高不純物濃度で、前記第1の第2導電型領域よりも低不純物濃度の複数の幅の等しい第5の第2導電型領域と、
を備えることを特徴とする半導体装置。 - 前記複数の第3の第2導電型領域は、前記複数の第5の第2導電型領域よりも高不純物濃度であることを特徴とする請求項1に記載の半導体装置。
- 前記複数の第3の第2導電型領域の個数は、前記複数の第5の第2導電型領域の個数よりも少ない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。
- 前記複数の第3の第2導電型領域の前記活性領域からn個目とn+1個目の間隔は、前記複数の第5の第2導電型領域の前記活性領域からn個目とn+1個目の間隔よりも狭いことを特徴とする請求項1〜3のいずれか一つに記載の半導体装置。
- 前記複数の第5の第2導電型領域の前記活性領域から1個目の第5の第2導電型領域の幅は、他の第5の第2導電型領域の幅よりも広いことを特徴とする請求項1〜4のいずれか一つに記載の半導体装置。
- 前記複数の第5の第2導電型領域の前記活性領域から1個目の第5の第2導電型領域は、前記第2の第2導電型領域と前記第4の第2導電型領域の境界にあることを特徴とする請求項1〜5のいずれか一つに記載の半導体装置。
- 前記複数の第5の第2導電型領域は、前記第2の第2導電型領域よりも高不純物濃度であることを特徴とする請求項1〜6のいずれか一つに記載の半導体装置。
- 前記第2の第2導電型領域の前記第3の第2導電型領域が設けられた部分は、前記第2の第2導電型領域の他の部分よりも深いことを特徴とする請求項1〜7のいずれか一つに記載の半導体装置。
- 前記第4の第2導電型領域の前記第5の第2導電型領域が設けられた部分は、前記第4の第2導電型領域の他の部分よりも深いことを特徴とする請求項1〜8のいずれか一つに記載の半導体装置。
- 前記シリコンよりもバンドギャップが広い半導体は、炭化珪素であることを特徴とする請求項1〜9のいずれか一つに記載の半導体装置。
- シリコンよりもバンドギャップの広い半導体からなる第1導電型の半導体基板と、
前記半導体基板のおもて面に設けられ、シリコンよりもバンドギャップの広い半導体からなり、前記半導体基板より低不純物濃度の第1導電型の半導体堆積膜と、
前記半導体堆積膜の、前記半導体基板のおもて面と反対側の表面層に設けられた金属半導体接合、または金属半導体接合と絶縁体半導体接合の複合構造を含む活性領域と、
前記活性領域の周囲を囲む、前記半導体堆積膜の前記表面層に設けられた耐圧構造部と、を備える半導体装置の製造方法であって、
前記活性領域を少なくとも部分的に囲む第1の第2導電型領域を形成する工程と、
前記耐圧構造部に、前記第1の第2導電型領域を囲む第2の第2導電型領域と、前記第2の第2導電型領域に内包され、前記活性領域より離れるに従い広くなる間隔を離して、前記第2の第2導電型領域よりも高不純物濃度で、前記第1の第2導電型領域よりも低不純物濃度の複数の幅の等しい第3の第2導電型領域を形成する工程と、
前記耐圧構造部に、前記第2の第2導電型領域を囲む第4の第2導電型領域と、前記第4の第2導電型領域に内包され、前記活性領域より離れるに従い広くなる間隔を離して、前記第4の第2導電型領域よりも高不純物濃度で、前記第1の第2導電型領域よりも低不純物濃度の複数の幅の等しい第5の第2導電型領域を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。
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