JP7271483B2 - 半導体装置、半導体装置の製造方法、インバータ回路、駆動装置、車両、及び、昇降機 - Google Patents
半導体装置、半導体装置の製造方法、インバータ回路、駆動装置、車両、及び、昇降機 Download PDFInfo
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- JP7271483B2 JP7271483B2 JP2020155005A JP2020155005A JP7271483B2 JP 7271483 B2 JP7271483 B2 JP 7271483B2 JP 2020155005 A JP2020155005 A JP 2020155005A JP 2020155005 A JP2020155005 A JP 2020155005A JP 7271483 B2 JP7271483 B2 JP 7271483B2
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Description
を含む炭化珪素層と、を備える。
第1の実施形態の半導体装置は、第1の電極と、第2の電極と、第1の電極と第2の電極との間に位置する炭化珪素層であって、n型の第1の炭化珪素領域と、第1の炭化珪素領域と第1の電極との間に位置し、第1の電極に接し、硫黄(S)、セレン(Se)、テルル(Te)、チタン(Ti)、ジルコニウム(Zr)、ハフニウム(Hf)、バナジウム(V)、ニオブ(Nb)、タンタル(Ta)、クロム(Cr)、モリブデン(Mo)、及びタングステン(W)から成る群から選ばれる元素を含み、4個のシリコン原子と結合する元素の1個の第1の原子を含む第2の炭化珪素領域と、を含む炭化珪素層と、を備える。
第2の実施形態の半導体装置は、炭化珪素層は、第2の炭化珪素領域を間に挟み、第1の電極に接する1対のp型の第3の炭化珪素領域を、を更に含む点で、第1の実施形態の半導体装置と異なる。以下、第1の実施形態と重複する内容については、一部記述を省略する。
第3の実施形態の半導体装置は、第1の電極と、第2の電極と、第1の電極と第2の電極との間に位置する炭化珪素層であって、n型の第1の炭化珪素領域と、第1の炭化珪素領域と第1の電極との間に位置し、第1の電極に接し、硫黄(S)、セレン(Se)、テルル(Te)、チタン(Ti)、ジルコニウム(Zr)、ハフニウム(Hf)、バナジウム(V)、ニオブ(Nb)、タンタル(Ta)、クロム(Cr)、モリブデン(Mo)、及びタングステン(W)から成る群から選ばれる元素を含み、4個のシリコン原子と結合する元素の1個の第1の原子を含む第2の炭化珪素領域と、第1の炭化珪素領域と第1の電極との間に位置するp型の第3の炭化珪素領域と、第3の炭化珪素領域と第1の電極との間に位置し、第1の電極に接し、第1の炭化珪素領域よりもn型不純物濃度の高いn型の第4の炭化珪素領域と、を含む炭化珪素層と、炭化珪素層の第1の電極の側に位置するゲート電極と、ゲート電極と第3の炭化珪素領域との間に位置するゲート絶縁層と、を備える。以下、第1の実施形態と重複する内容については、一部記述を省略する。
第3の実施形態の第1の変形例の半導体装置は、炭化珪素層が電流拡散領域を含む点で、第3の実施形態の半導体装置と異なる。
第3の実施形態の第2の変形例の半導体装置は、側面が第4の炭化珪素領域に接するシリサイド層を備える点で、第3の実施形態の半導体装置と異なる。
第4の実施形態の半導体装置は、第3の炭化珪素領域が第2の炭化珪素領域に接する点で、第3の実施形態の半導体装置と異なる。以下、第3の実施形態と重複する内容については、一部記述を省略する。
第5の実施形態の半導体装置は、第2の炭化珪素領域と第1の電極との界面が、第1の面よりも第2の面の側にある点で、第4の実施形態の半導体装置と異なる。以下、第4の実施形態と重複する内容については、一部記述を省略する。
第5の実施形態の変形例の半導体装置は、第4の炭化珪素領域のパターンが異なる点で、第5の実施形態の半導体装置と異なる。
第6の実施形態の半導体装置は、ゲートトレンチとソーストレンチを備える点で、第3の実施形態の半導体装置と異なる。以下、第3の実施形態と重複する内容については、一部記述を省略する。
第7の実施形態の半導体装置は、硫黄領域が、ソーストレンチの底部に設けられる点で、第6の実施形態の半導体装置と異なる。以下、第6の実施形態と重複する内容については、一部記述を省略する。
第8の実施形態の半導体装置は、ソーストレンチが2個設けられ、硫黄領域と第1の電極が第1の面で接する点で、第6の実施形態の半導体装置と異なる。以下、第6の実施形態と重複する内容については、一部記述を省略する。
第9の実施形態の半導体装置は、2個のソーストレンチの間に、更に別のトレンチが設けられる点で、第8の実施形態の半導体装置と異なる。以下、第8の実施形態と重複する内容については、一部記述を省略する。
硫黄領域57は、中間トレンチ82と第2のソーストレンチ80bとの間に挟まれる。硫黄領域57は、pウェルコンタクト領域62とp領域66との間に挟まれる。硫黄領域57は、pウェルコンタクト領域62及びp領域66に接する。
第10の実施形態のインバータ回路及び駆動装置は、第3の実施形態の半導体装置を備えるインバータ回路及び駆動装置である。
第11の実施形態の車両は、第3の実施形態の半導体装置を備える車両である。
第12の実施形態の車両は、第3の実施形態の半導体装置を備える車両である。
第13の実施形態の昇降機は、第3の実施形態の半導体装置を備える昇降機である。
12 アノード電極(第1の電極)
14 カソード電極(第2の電極)
18 ドリフト領域(第1の炭化珪素領域)
20 硫黄領域(第2の炭化珪素領域)
22 酸化膜
23 炭素膜
24 積層膜(導電膜)
26 p型領域(第3の炭化珪素領域)
42 ソース電極(第1の電極)
42X 第1の部分
42Y 第2の部分
44 ドレイン電極(第2の電極)
46 ゲート絶縁層
50 ゲート電極
56 ドリフト領域(第1の炭化珪素領域)
57 硫黄領域(第2の炭化珪素領域)
58 pウェル領域(第3の炭化珪素領域)
60 ソース領域(第4の炭化珪素領域)
100 SBD(半導体装置)
150 インバータ回路
200 JBSダイオード(半導体装置)
300 MOSFET(半導体装置)
400 MOSFET(半導体装置)
500 MOSFET(半導体装置)
600 MOSFET(半導体装置)
700 MOSFET(半導体装置)
800 MOSFET(半導体装置)
900 MOSFET(半導体装置)
1000 駆動装置
1100 車両
1200 車両
1300 昇降機
Claims (24)
- 第1の電極と、
第2の電極と、
前記第1の電極と前記第2の電極との間に位置する炭化珪素層であって、
n型の第1の炭化珪素領域と、
前記第1の炭化珪素領域と前記第1の電極との間に位置し、前記第1の電極に接し、硫黄(S)、セレン(Se)、テルル(Te)、チタン(Ti)、ジルコニウム(Zr)、ハフニウム(Hf)、バナジウム(V)、ニオブ(Nb)、タンタル(Ta)、クロム(Cr)、モリブデン(Mo)、及びタングステン(W)から成る群から選ばれる元素を含み、4個のシリコン原子と結合する前記元素の1個の第1の原子を含む第2の炭化珪素領域と、
を含む炭化珪素層と、
を備える半導体装置。 - 前記第2の炭化珪素領域の前記元素の最大濃度は1×1017cm-3以上1×1022cm-3以下である請求項1記載の半導体装置。
- 前記第1の電極と前記第2の炭化珪素領域との中の前記元素の濃度分布が第1のピークを有し、前記第1の電極と前記第2の炭化珪素領域との間の界面と前記第1のピークとの間の距離が50nm以下である請求項1又は請求項2記載の半導体装置。
- 前記第1の電極と前記第2の炭化珪素領域との中の前記元素の濃度分布が、前記第1のピークと前記第1の炭化珪素領域との間に、第2のピークを有する請求項3記載の半導体装置。
- 前記第1の電極は、金属シリサイドを含む請求項1ないし請求項4いずれか一項記載の半導体装置。
- 前記炭化珪素層は、前記第2の炭化珪素領域を間に挟み、前記第1の電極に接する1対のp型の第3の炭化珪素領域を、を更に含む請求項1ないし請求項5いずれか一項記載の半導体装置。
- 前記第2の炭化珪素領域の中に含まれる前記元素の中で、4個のシリコン原子と結合する前記元素の1個の第1の原子の割合が、4個の炭素原子と結合する前記元素の1個の第2の原子の割合よりも高い請求項1ないし請求項6いずれか一項記載の半導体装置。
- 第1の電極と、
第2の電極と、
前記第1の電極と前記第2の電極との間に位置する炭化珪素層であって、
n型の第1の炭化珪素領域と、
前記第1の炭化珪素領域と前記第1の電極との間に位置し、前記第1の電極に接し、硫黄(S)、セレン(Se)、テルル(Te)、チタン(Ti)、ジルコニウム(Zr)、ハフニウム(Hf)、バナジウム(V)、ニオブ(Nb)、タンタル(Ta)、クロム(Cr)、モリブデン(Mo)、及びタングステン(W)から成る群から選ばれる元素を含み、4個のシリコン原子と結合する前記元素の1個の第1の原子を含む第2の炭化珪素領域と、
前記第1の炭化珪素領域と前記第1の電極との間に位置するp型の第3の炭化珪素領域と、
前記第3の炭化珪素領域と前記第1の電極との間に位置し、前記第1の電極に接し、前記第1の炭化珪素領域よりもn型不純物濃度の高いn型の第4の炭化珪素領域と、
を含む炭化珪素層と、
前記炭化珪素層の前記第1の電極の側に位置するゲート電極と、
前記ゲート電極と前記第3の炭化珪素領域との間に位置するゲート絶縁層と、
を備える半導体装置。 - 前記第2の炭化珪素領域の前記元素の最大濃度は1×1017cm-3以上1×1022cm-3以下である請求項8記載の半導体装置。
- 前記第1の電極と前記第2の炭化珪素領域との中の前記元素の濃度分布が第1のピークを有し、前記第1の電極と前記第2の炭化珪素領域との間の界面と前記第1のピークとの間の距離が50nm以下である請求項8又は請求項9記載の半導体装置。
- 前記第1の電極と前記第2の炭化珪素領域との中の前記元素の濃度分布が、前記第1のピークと前記第1の炭化珪素領域との間に、第2のピークを有する請求項10記載の半導体装置。
- 前記第1の電極は、金属シリサイドを含む請求項8ないし請求項11いずれか一項記載の半導体装置。
- 前記第1の電極の前記第2の炭化珪素領域に接する第1の部分と、前記第1の電極の前記第4の炭化珪素領域に接する第2の部分は、同一の材料である請求項8ないし請求項12いずれか一項記載の半導体装置。
- 前記第2の炭化珪素領域の中に含まれる前記元素の中で、4個のシリコン原子と結合する前記元素の1個の第1の原子の割合が、4個の炭素原子と結合する前記元素の1個の第2の原子の割合よりも高い請求項8ないし請求項13いずれか一項記載の半導体装置。
- 請求項1ないし請求項14いずれか一項記載の半導体装置を備えるインバータ回路。
- 請求項1ないし請求項14いずれか一項記載の半導体装置を備える駆動装置。
- 請求項1ないし請求項14いずれか一項記載の半導体装置を備える車両。
- 請求項1ないし請求項14いずれか一項記載の半導体装置を備える昇降機。
- n型の第1の炭化珪素領域を有する炭化珪素層に、硫黄(S)、セレン(Se)、テルル(Te)、チタン(Ti)、ジルコニウム(Zr)、ハフニウム(Hf)、バナジウム(V)、ニオブ(Nb)、タンタル(Ta)、クロム(Cr)、モリブデン(Mo)、及びタングステン(W)から成る群から選ばれる元素を注入する第1のイオン注入を行い、
前記炭化珪素層に、シリコン(Si)を注入する第2のイオン注入を行い、
前記炭化珪素層の上に導電膜を形成し、
第1の熱処理を行う半導体装置の製造方法。 - 前記導電膜を形成する前に、前記炭化珪素層に、炭素(C)を注入する第3のイオン注入を行う請求項19記載の半導体装置の製造方法。
- 前記第1のイオン注入、前記第2のイオン注入、及び前記第3のイオン注入の後、前記導電膜を形成する前に、前記第1の熱処理よりも温度の高い第2の熱処理を、更に行う請求項20記載の半導体装置の製造方法。
- 前記第1のイオン注入、前記第2のイオン注入、及び前記第3のイオン注入の後、前記第2の熱処理の前に、前記炭化珪素層の上に炭素膜を形成する請求項21記載の半導体装置の製造方法。
- 前記第1のイオン注入、前記第2のイオン注入、及び前記第3のイオン注入の前に、前記炭化珪素層の上に酸化膜を形成し、
前記第1のイオン注入、前記第2のイオン注入、及び前記第3のイオン注入の後、前記導電膜を形成する前に、前記酸化膜を除去する請求項20ないし請求項22いずれか一項記載の半導体装置の製造方法。 - 前記第1の熱処理の温度は300℃以上700℃以下である請求項19ないし請求項23いずれか一項記載の半導体装置の製造方法。
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