JPWO2015115202A1 - 炭化珪素半導体装置 - Google Patents
炭化珪素半導体装置 Download PDFInfo
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- JPWO2015115202A1 JPWO2015115202A1 JP2015559867A JP2015559867A JPWO2015115202A1 JP WO2015115202 A1 JPWO2015115202 A1 JP WO2015115202A1 JP 2015559867 A JP2015559867 A JP 2015559867A JP 2015559867 A JP2015559867 A JP 2015559867A JP WO2015115202 A1 JPWO2015115202 A1 JP WO2015115202A1
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- layer
- silicon carbide
- doping concentration
- drift layer
- breakdown voltage
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- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 223
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 219
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 239000002344 surface layer Substances 0.000 claims description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 1
- 239000005052 trichlorosilane Substances 0.000 description 1
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Abstract
Description
<構成>
図1は、本発明の第1実施形態に関する炭化珪素半導体装置の構成を示す断面図である。また、図2は、本発明の第1実施形態に関するエピタキシャル基板の構造を示す断面図である。
次に、本実施形態のエピタキシャル基板100の製造方法について説明する。
このように、本実施形態によれば、炭化珪素半導体装置が、第1導電型の炭化珪素基板1と、炭化珪素基板1上に形成され、ドーパントがドーピングされた、膜厚がdである第1導電型の耐圧保持層とを備える。
<構成>
以下では、上記実施形態で説明した構成と同様の構成については同じ符号を付して図示し、その詳細な説明については適宜省略する。
このように、本実施形態によれば、炭化珪素半導体装置が、第1導電型の炭化珪素基板1と、炭化珪素基板1上に形成され、ドーパントがドーピングされた、膜厚がdである第1導電型の耐圧保持層とを備える。
<構成>
本実施形態は第1実施形態の変形例である。以下では、上記実施形態で説明した構成と同様の構成については同じ符号を付して図示し、その詳細な説明については適宜省略する。
このような構成であることにより、実現可能な手法によって、耐圧保持層のドーピング濃度分布を、オン抵抗低減のために理想的なドーピング濃度分布に近づけることができるため、ドリフト抵抗を最大25%程度低減することができる。また、炭化珪素基板1とドリフト層2との間の格子定数差によって生じる結晶欠陥の導入を抑制することができる。よって、キャリアの移動度の低下が生じることがなく、素子抵抗の上昇を抑えることができる。
<構成>
本実施形態は第1実施形態の変形例である。以下では、上記実施形態で説明した構成と同様の構成については同じ符号を付して図示し、その詳細な説明については適宜省略する。
このような構成であることにより、実現可能な手法によって、耐圧保持層のドーピング濃度分布を、オン抵抗低減のために理想的なドーピング濃度分布に近づけることができるため、ドリフト抵抗を最大25%程度低減することができる。また、炭化珪素基板1とドリフト層2との間の格子定数差によって生じる結晶欠陥の導入を抑制することができる。よって、キャリアの移動度の低下が生じることがなく、素子抵抗の上昇を抑えることができる。
<構成>
本実施形態は第1実施形態又は第2実施形態の変形例である。以下では、上記実施形態で説明した構成と同様の構成については同じ符号を付して図示し、その詳細な説明については適宜省略する。
このような構成であることにより、実現可能な手法によって、耐圧保持層のドーピング濃度分布を、オン抵抗低減のために理想的なドーピング濃度分布に近づけることができるため、ドリフト抵抗を最大25%程度低減することができる。また、炭化珪素基板1とドリフト層2との間の格子定数差によって生じる結晶欠陥の導入を抑制することができる。よって、キャリアの移動度の低下が生じることがなく、素子抵抗の上昇を抑えることができる。
<構成>
本実施形態は第2実施形態又は第3実施形態の変形例である。以下では、上記実施形態で説明した構成と同様の構成については同じ符号を付して図示し、その詳細な説明については適宜省略する。
このような構成であることにより、実現可能な手法によって、耐圧保持層のドーピング濃度分布を、オン抵抗低減のために理想的なドーピング濃度分布に近づけることができるため、ドリフト抵抗を最大25%程度低減することができる。また、炭化珪素基板1とドリフト層2との間の格子定数差によって生じる結晶欠陥の導入を抑制することができる。よって、キャリアの移動度の低下が生じることがなく、素子抵抗の上昇を抑えることができる。
<構成>
本実施形態は第2実施形態又は第3実施形態の変形例である。以下では、上記実施形態で説明した構成と同様の構成については同じ符号を付して図示し、その詳細な説明については適宜省略する。
このような構成であることにより、実現可能な手法によって、耐圧保持層のドーピング濃度分布を、オン抵抗低減のために理想的なドーピング濃度分布に近づけることができるため、ドリフト抵抗を最大25%程度低減することができる。また、炭化珪素基板1とドリフト層2との間の格子定数差によって生じる結晶欠陥の導入を抑制することができる。よって、キャリアの移動度の低下が生じることがなく、素子抵抗の上昇を抑えることができる。
本技術の別の態様に関する炭化珪素半導体装置は、第1導電型の炭化珪素基板と、前記炭化珪素基板上に形成され、ドーパントがドーピングされた第1導電型のドリフト層と、前記ドリフト層の表層において、互いに離間して複数形成された第2導電型のボディ領域とを備え、前記ドリフト層の表層における、複数の前記ボディ領域に挟まれた領域をJFET領域とし、前記JFET領域は、膜厚方向であるx軸と垂直な平面方向の2方向であるy方向及びz方向に離散して形成され、前記ドリフト層の表面がボディ領域の下面であり、定格耐圧をV[V]とした場合に、前記ドリフト層の表面における前記ドーピング濃度をドーピング濃度N F [cm −3 ]が、
本技術の別の態様に関する炭化珪素半導体装置は、第1導電型の炭化珪素基板と、前記炭化珪素基板上に形成され、ドーパントがドーピングされた第1導電型のドリフト層と、前記ドリフト層の表層において、互いに離間して複数形成された第2導電型のボディ領域とを備え、前記ドリフト層の表層における、複数の前記ボディ領域に挟まれた領域をJFET領域とし、前記JFET領域は、膜厚方向であるx軸と垂直な平面方向の2方向であるy方向及びz方向に離散して形成され、前記ドリフト層の表面が前記ボディ領域の下面であり、定格耐圧をV[V]とした場合に、前記ドリフト層の表面におけるドーピング濃度NF[cm−3]が、
Claims (16)
- 第1導電型の炭化珪素基板(1)と、
前記炭化珪素基板(1)上に形成され、ドーパントがドーピングされた第1導電型のドリフト層(2)とを備え、
前記ドリフト層(2)は、前記ドーパントのドーピング濃度が4×1015cm−3以上2×1017cm−3以下の値となる地点から前記ドリフト層(2)の表面に亘る、膜厚がdである耐圧保持層を有し、
前記耐圧保持層の前記ドーパントのドーピング濃度は、前記耐圧保持層の前記ドリフト層(2)の表面へ向かう膜厚方向において連続的に低下する、
炭化珪素半導体装置。 - 第1導電型の炭化珪素基板(1)と、
前記炭化珪素基板(1)上に形成され、ドーパントがドーピングされた第1導電型のドリフト層(2)と、
前記ドリフト層(2)の表層において、互いに離間して複数形成された第2導電型のボディ領域(14)とを備え、
前記ドリフト層(2)の表層における、複数の前記ボディ領域に挟まれた領域をJFET領域(35)とし、
前記JFET領域(35)と前記ボディ領域(14)とは周期的に形成され、
前記ドリフト層(2)は、前記ドーパントのドーピング濃度が所定の値となる地点から前記ドリフト層(2)の表面に亘る、膜厚がdである耐圧保持層を有し、
前記耐圧保持層の前記ドーパントのドーピング濃度は、
前記耐圧保持層の前記ドーパントのドーピング濃度が所定の値となる地点から前記耐圧保持層の膜厚方向における中間点よりも前記ドリフト層(2)の表面側に位置する変調点までは、前記耐圧保持層の前記ドリフト層(2)の表面へ向かう膜厚方向において連続的に低下し、
前記変調点から前記ドリフト層(2)の表面までは、前記耐圧保持層の前記ドリフト層(2)の表面へ向かう膜厚方向において連続的に増加する、
炭化珪素半導体装置。 - 前記所定の値が、3×1015cm−3以上1×1017cm−3以下である、
請求項5に記載の炭化珪素半導体装置。 - 前記膜厚方向をx軸方向とし、前記ドリフト層(2)の表面をx=0、前記ドーパントのドーピング濃度が3×1015cm−3以上1×1017cm−3以下の値となる地点をx=d、前記ドリフト層(2)の表面から前記変調点までの膜厚方向の距離をdmin、前記JFET領域(35)の配置ピッチをLfp、隣接する前記ボディ領域(14)間に形成される前記JFET領域(35)の幅をLj、濃度分布を規定する負の値λとした場合、前記耐圧保持層の濃度分布g(x)は、0≦x<dminの場合に、
請求項6に記載の炭化珪素半導体装置。 - 前記JFET領域(35)は、前記膜厚方向であるx軸と垂直な平面方向の2方向であるy方向及びz方向に離散して形成され、
前記x軸方向において、前記ドリフト層(2)の表面をx=0、前記ドーパントのドーピング濃度が3×1015cm−3以上1×1017cm−3以下の値となる地点をx=dとし、前記ドリフト層(2)の表面から前記変調点までの膜厚方向の距離をdmin、前記JFET領域(35)の配置ピッチをLfp2、隣接する前記ボディ領域(14)間に形成される前記JFET領域(35)の幅をLj2、濃度分布を規定する負の値λとした場合、前記耐圧保持層の濃度分布g(x)は、0≦x<dminの場合に、
請求項6に記載の炭化珪素半導体装置。 - 前記濃度分布を規定する負の値λは、−1×10−37m5C2/V2F2以上−1×10−39m5C2/V2F2以下である、
請求項7又は請求項8に記載の炭化珪素半導体装置。 - 前記変調点から前記ドリフト層(2)の表面までの距離は、前記耐圧保持層の膜厚の1/3以下である、
請求項5に記載の炭化珪素半導体装置。 - 前記耐圧保持層は、複数の線形濃度分布層(2a〜b、2c〜e、2f〜i)が前記膜厚方向に重なって形成されている、
請求項1から請求項8及び請求項10から請求項12のうちのいずれか1項に記載の炭化珪素半導体装置。 - 前記ドーパントが、窒素である、
請求項1から請求項8及び請求項10から請求項12のうちのいずれか1項に記載の炭化珪素半導体装置。 - 請求項1から請求項8及び請求項10から請求項12のうちのいずれか1項に記載の炭化珪素半導体装置を製造する炭化珪素半導体装置の製造方法であって、
珪素原子供給ガス及び炭素原子供給ガスの供給量を一定にしたまま、ドーパントガスの供給量を暫時低減あるいは増加してエピタキシャル成長させることで、前記ドリフト層(2)を形成する、
炭化珪素半導体装置の製造方法。 - 請求項1から請求項8及び請求項10から請求項12のうちのいずれか1項に記載の炭化珪素半導体装置を製造する炭化珪素半導体装置の製造方法であって、
ドーパントガスの供給量を一定にしたまま、珪素原子供給ガス及び炭素原子供給ガスのうちの少なくとも一方の供給量を暫時増加あるいは低減してエピタキシャル成長させることで、前記ドリフト層(2)を形成する、
炭化珪素半導体装置の製造方法。
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2015
- 2015-01-16 WO PCT/JP2015/051015 patent/WO2015115202A1/ja active Application Filing
- 2015-01-16 US US15/111,642 patent/US9722017B2/en active Active
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JP6058170B2 (ja) | 2017-01-11 |
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