JP7023882B2 - 半導体装置の製造方法、基板の製造方法、半導体装置、基板、及び、基板の製造装置 - Google Patents
半導体装置の製造方法、基板の製造方法、半導体装置、基板、及び、基板の製造装置 Download PDFInfo
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- JP7023882B2 JP7023882B2 JP2019018140A JP2019018140A JP7023882B2 JP 7023882 B2 JP7023882 B2 JP 7023882B2 JP 2019018140 A JP2019018140 A JP 2019018140A JP 2019018140 A JP2019018140 A JP 2019018140A JP 7023882 B2 JP7023882 B2 JP 7023882B2
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Description
図面は模式的または概念的なものであり、各部分の厚さと幅との関係、部分間の大きさの比率などは、必ずしも現実のものと同一とは限らない。同じ部分を表す場合であっても、図面により互いの寸法や比率が異なって表される場合もある。
本願明細書と各図において、既出の図に関して前述したものと同様の要素には同一の符号を付して詳細な説明は適宜省略する。
図1は、第1実施形態に係る半導体装置の製造方法を例示するフローチャート図である。
図1に示すように、実施形態に係る半導体装置の製造方法は、第1工程(ステップS110)、第2工程(ステップS120)及び第3工程(ステップS130)を含む。実施形態に係る製造方法は、他の工程(他のステップ)をさらに含んでも良い。
図2(a)~図2(e)、及び、図3(a)~図3(d)は、第1実施形態に係る半導体装置の製造方法を例示する模式図である。
図2(a)、図2(c)、図3(a)及び図3(c)は、平面図である。図2(b)、図2(d)、図2(e)、図3(b)及び図3(d)は、断面図である。図2(b)は、図2(a)に対応する断面図である。図2(d)は、図2(c)に対応する断面図である。図3(b)は、図3(a)に対応する断面図である。図3(d)は、図3(c)に対応する断面図である。
図4(a)~図4(d)は、積層欠陥72の拡張を例示する顕微鏡写真像である。図4(a)に示すように、エネルギー線75の照射の初期段階では、基底面転位71x(基体10sの基底面転位71が伝搬して生じた転位)が観察される。図4(b)に示すように、照射の時間が長くなると、積層欠陥72は、Y軸方向に拡張し、台形状になる。辺72aは、例えば、CコアのPD(partial dislocation)に対応する。辺72bは、SiコアのPDに対応する。
図5(a)~図5(d)は、第1工程の後に得られる積層欠陥72の状態を例示する模式的平面図である。図5(e)は、結晶方位を例示している。上記の角度θ(図3(d)参照)が例えば、10度以下と小さい場合、Z軸方向に沿ってみたときに、積層欠陥72の三角形の頂角は30度と見なして良い。
第2実施形態は、基板の製造方法に係る。
この製造方法は、第1工程(図1のステップS110)、及び、第2工程(図1のステップS120)を含む。既に説明したように、第1工程においては、第1半導体層10に紫外線及び電子線よりなる群から選択された少なくとも1つ(例えばエネルギー線75)を照射する。照射により、積層欠陥72を拡張させる。第1半導体層10は、炭化珪素を含む基体の上に設けられる。第1半導体層10は、炭化珪素と、N、P及びAsよりなる群から選択された少なくとも1つを含む第1元素と、を含む。
第3実施形態は、半導体装置に係る。
図6に示すように、実施形態に係る半導体装置120は、第1半導体層10、第2半導体層20及び第3半導体層30を含む。
図7に示すように、実施形態に係る半導体装置121においては、基体10sAがp形である。半導体装置121におけるこれ以外の構成は、半導体装置120の構成と同じである。半導体装置121は、例えば、IGBT(Insulated Gate Bipolar Transistor)である。
図8に示すように、実施形態に係る半導体装置131は、第1半導体層10、第2半導体層20、第3半導体層30、第1電極51及び第2電極52を含む。半導体装置131は、pn接合ダイオードである。
第4実施形態は、基板に係る。基板は、例えば、SiCを含む基板である。図6~図8に例示した、基体10s(または基体10sA)、第1半導体層10及び第2半導体層20は、実施形態に係る基板210(または基板211)に含まれる。
第5実施形態は、基板の製造装置に係る。基板の製造装置は、半導体装置の製造装置でも良い。
図9に示すように、実施形態に係る基板の製造装置510は、処理室81、ステージ82及び照射部83を含む。
Claims (19)
- 炭化珪素を含む基体の上に設けられ、炭化珪素と、N、P及びAsよりなる群から選択された少なくとも1つを含む第1元素と、を含む第1半導体層の積層欠陥を拡張させる第1工程と、
第1工程後に、拡張した前記積層欠陥を縮小させないで、前記第1半導体層の上に炭化珪素と前記第1元素とを含む第2半導体層を形成する第2工程と、
前記第2半導体層の上に、炭化珪素と、B、Al及びGaよりなる群から選択された少なくとも1つを含む第2元素と、を含む第3半導体層を形成する第3工程と、
を備えた半導体装置の製造方法。 - 前記第1工程は、前記第1半導体層に、紫外線及び電子線よりなる群から選択された少なくとも1つを照射することを含む、請求項1記載の半導体装置の製造方法。
- 炭化珪素を含む基体の上に設けられ、炭化珪素と、N、P及びAsよりなる群から選択された少なくとも1つを含む第1元素と、を含む第1半導体層に紫外線を照射する第1工程と、
第1工程後に、積層欠陥を縮小させないで、前記第1半導体層の上に炭化珪素と前記第1元素とを含む第2半導体層を形成する第2工程と、
前記第2半導体層の上に炭化珪素とB、Al及びGaよりなる群から選択された少なくとも1つを含む第2元素と、を含む第3半導体層を形成する第3工程と、
を備えた半導体装置の製造方法。 - 前記照射することは、450℃以下で実施される、請求項2または3に記載の半導体装置の製造方法。
- 前記基体の上に前記第1半導体層を形成する工程をさらに備え、
前記第1半導体層を形成する前記工程は、第1処理室中で実施され、
前記第1工程は、前記第1処理室で実施され、
前記第2工程は、前記第1処理室で実施される、請求項1~4のいずれか1つに記載の半導体装置の製造方法。 - 前記基体の上に前記第1半導体層を形成する工程をさらに備え、
前記第1半導体層を形成する前記工程、前記第1工程、及び、前記第2工程は、大気圧中を経ないで減圧中で実施される、請求項1~4のいずれか1つに記載の半導体装置の製造方法。 - 前記第1半導体層の厚さは、前記第2半導体層の厚さの1/2以下である、請求項1~6のいずれか1つに記載の半導体装置の製造方法。
- 前記第1半導体層は、前記基体の上にエピタキシャル成長され、
前記第2工程は、前記第1半導体層の上に、前記第2半導体層をエピタキシャル成長させることを含む、請求項1~7のいずれか1つに記載の半導体装置の製造方法。 - 前記第2半導体層と電気的に接続された第1電極と、前記第3半導体層と電気的に接続された第2電極と、を形成する工程をさらに備えた、請求項1~8のいずれか1つに記載の半導体装置の製造方法。
- 炭化珪素を含む基体の上に設けられ、炭化珪素と、N、P及びAsよりなる群から選択された少なくとも1つを含む第1元素と、を含む第1半導体層に紫外線を照射する第1工程と、
第1工程後に、積層欠陥を縮小させないで、前記第1半導体層の上に炭化珪素と前記第1元素とを含む第2半導体層を形成する第2工程と、
を備えた基板の製造方法。 - 炭化珪素と、N、P及びAsよりなる群から選択された少なくとも1つを含む第1元素と、を含む第1半導体層と、
炭化珪素と前記第1元素とを含む第2半導体層と、
炭化珪素と、B、Al及びGaよりなる群から選択された少なくとも1つを含む第2元素と、を含む第3半導体層と、
を備え、
前記第2半導体層は、前記第1半導体層と前記第3半導体層との間にあり、
前記第1半導体層は、積層欠陥を含み、
前記積層欠陥は、<-1100>方向に沿う第1辺を含み、
前記第1辺は、前記第2半導体層と接する、半導体装置。 - 前記第1半導体層は、前記第2半導体層に対向する第1面を含み、
前記第1面と、{0001}面と、間の角度は、角度θであり、
前記第1半導体層は、前記第1面に対して垂直な第1方向の厚さt1を有し、
前記第1辺の前記第1面に沿う第1長さは、2×t1/(tan(θ))以下である、請求項11記載の半導体装置。 - 前記第1長さは、2×t1/(tan(θ))の0.8倍以上1倍以下である、請求項12記載の半導体装置。
- 前記第1半導体層は、前記第2半導体層に対向する第1面を含み、
前記第1面と、{0001}面と、間の角度は、角度θであり、
前記第1半導体層は、前記第1面に対して垂直な第1方向の厚さt1を有し、
前記積層欠陥は、<11-20>方向に沿う第2辺を含み、
前記第2辺の前記第1面に沿う第2長さは、t1/(tan(θ))以下である、請求項11記載の半導体装置。 - 前記第2長さは、t1/(tan(θ))の0.8倍以上1倍以下である、請求項14記載の半導体装置。
- 炭化珪素を含む基体をさらに備え、
前記基体と前記第2半導体層との間に前記第1半導体層があり、
前記第1半導体層における前記第1元素の濃度は、前記基体における前記第1元素の濃度と、前記第2半導体層における前記第1元素の濃度と、の間である、請求項11~15のいずれか1つに記載の半導体装置。 - 炭化珪素を含む基体と、
炭化珪素と、N、P及びAsよりなる群から選択された少なくとも1つを含む第1元素と、を含む第1半導体層と、
炭化珪素と前記第1元素とを含む第2半導体層と、
を備え、
前記第1半導体層は、前記基体と前記第2半導体層との間にあり、
前記第1半導体層は、積層欠陥を含み、
前記積層欠陥は、<-1100>方向に沿う第1辺を含み、
前記第1辺は、前記第2半導体層に接する、基板。 - 前記第1半導体層は、前記第2半導体層に対向する第1面を含み、
前記第1面と、{0001}面と、間の角度は、角度θであり、
前記第1半導体層は、前記第1面に対して垂直な第1方向の厚さt1を有し、
前記第1辺の前記第1面に沿う第1長さは、2×t1/(tan(θ))の0.8倍以上1倍以下である、請求項17記載の基板。 - 前記第1半導体層は、前記第2半導体層に対向する第1面を含み、
前記第1面と、{0001}面と、間の角度は、角度θであり、
前記第1半導体層は、前記第1面に対して垂直な第1方向の厚さt1を有し、
前記積層欠陥は、<11-20>方向に沿う第2辺を含み、
前記第2辺の前記第1面に沿う第2長さは、t1/(tan(θ))の0.8倍以上1倍以下である、請求項17記載の基板。
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