JP7594585B2 - SiCでできたキャリア基材上に単結晶SiCの薄層を備える複合構造を作成するプロセス - Google Patents
SiCでできたキャリア基材上に単結晶SiCの薄層を備える複合構造を作成するプロセス Download PDFInfo
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Description
c-SiCドナー基材内に埋め込み脆性平面を形成するステップであって、前記埋め込み脆性平面は、前記埋め込み脆性平面とドナー基材の前表面との間で薄層の境界を定める、形成するステップと、
金属、例えば、タングステン又はモリブデンの層をドナー基材の前表面上に堆積させて、補剛材として働くのに十分な厚さを有するキャリア基材を形成するステップと、
埋め込み脆性平面に沿って分離して、一方で金属キャリア基材及びc-SiCの薄層を備える複合構造を、他方でc-SiCドナー基材の残余物を形成するステップと
を含む。
a)単結晶シリコンカーバイドでできた初期基材を用意するステップと、
b)初期基材上に単結晶シリコンカーバイドドナー層をエピタキシャル成長させて、ドナー基材を形成するステップであって、ドナー層は初期基材の結晶欠陥密度より低い結晶欠陥密度を有する、形成するステップと
c)ドナー層内に軽い種をイオン注入して、埋め込み脆性平面を形成するステップであって、前記埋め込み脆性平面は、前記埋め込み脆性平面と前記ドナー層の自由表面との間で薄層の境界を定める、形成するステップと、
d)1000℃より低い温度で直接液体注入-化学気相堆積を行って、ドナー層の自由表面のすぐ上にキャリア層を形成するステップであって、前記キャリア層は、少なくとも部分的にアモルファスなSiCマトリックスによって形成される、形成するステップと、
e)埋め込み脆性平面に沿って分離して、一方で、キャリア層上に薄層を備える中間複合構造を、他方でドナー基材の残余物を形成するステップと、
f)中間複合構造に適用される1000℃と1800℃との間の温度での熱処理を行って、キャリア層を結晶化させ、多結晶キャリア基材を形成するステップと、
g)複合構造の機械的処理及び/又は化学的処理のステップであって、当該処理は、キャリア基材の自由面、複合構造の後面、及び/又は薄層(10)の自由面、複合構造の前面に適用される、機械的処理及び/又は化学的処理のステップと
を含む。
堆積ステップd)は、100℃と700℃との間、又はさらに好ましくは200℃と600℃との間の温度で実施される;
堆積ステップd)は、1Torrと500Torrとの間の圧力で実施される;
堆積ステップd)の間に使用される前駆物質は、ポリシリルエチレン及びジシラブタンから選択される;
堆積ステップd)の終了時に、キャリア層は、10ミクロン以上の厚さ、又はさらに50ミクロン以上の厚さ、又はさらに100ミクロン以上の厚さ、又はさらに200ミクロン以上の厚さを有する;
化学的エッチング、機械的研削、及び/又は機械的化学的研磨が、ステップd)とステップe)との間で、キャリア層の自由面に適用される;
ステップa)は、初期基材の基底平面転位欠陥を貫通刃状転移欠陥に変換するために、初期基材上での単結晶変換層の形成を含む;
エピタキシャル成長ステップb)は、1200℃より高い、好ましくは1500℃と1650℃との間の温度で実施される;
分離ステップe)は、ステップd)の堆積温度より高い温度で実施される;
分離ステップe)は、堆積ステップd)の間に、好ましくはステップd)の終了時に起こる;
分離ステップe)及び結晶化ステップf)は、同じ熱処理中に起こる;
ステップg)は、複合構造の前面及び後面の機械的化学的同時研磨を含む;
ドナー基材の残余物を初期基材として又はドナー基材として再使用するために、ドナー基材の残余物を再調節するステップを含む。
良好な電気伝導率、すなわち、0.03ohm.cm以下、又はさらに0.01ohm.cm以下、
高い熱伝導率、すなわち、150W.m-1.K-1以上、又はさらに200W.m-1.K-1以上、
及び、薄層10の熱膨張係数に近い熱膨張係数、すなわち、室温で、3.8E-6/Kと4.2E-6/Kとの間
を有するように決定される。
前記キャリア基材20の後面20bの機械的化学的研磨(MCP)及び/又は化学的処理(エッチング又は洗浄)及び/又は機械的処理(研削)を含んでもよい。後面で除去される厚さは約100ミクロンと数ミクロンとの間であってもよい。
Claims (13)
- シリコンカーバイドでできたキャリア基材(20)上に配置された単結晶シリコンカーバイドの薄層(10)を備える複合構造(1)を作成するプロセスであって、
a)単結晶シリコンカーバイドでできた初期基材(11)を用意するステップと、
b)前記初期基材(11)上に単結晶シリコンカーバイドのドナー層(110)をエピタキシャル成長させて、ドナー基材(111)を形成するステップであって、前記ドナー層(110)は前記初期基材(11)の結晶欠陥密度より低い結晶欠陥密度を有する、形成するステップと、
c)前記ドナー層(110)内に軽い種をイオン注入して、埋め込み脆性平面(12)を形成するステップであって、前記埋め込み脆性平面(12)は、前記埋め込み脆性平面(12)と前記ドナー層(110)の自由表面との間で前記薄層(10)の境界を定める、形成するステップと、
d)1000℃より低い温度で直接液体注入-化学気相堆積を行って、前記ドナー層(110)の前記自由表面のすぐ上にキャリア層(20’)を形成するステップであって、前記キャリア層(20’)は、少なくとも部分的にアモルファスなSiCマトリックスによって形成される、形成するステップと、
e)前記埋め込み脆性平面(12)に沿って分離して、一方で、前記キャリア層(20’)上に前記薄層(10)を備える中間複合構造(1’)を、他方で前記ドナー基材の残余物(111’)を形成するステップと、
f)前記中間複合構造(1’)に適用される1000℃と1800℃との間の温度での熱処理を行って、前記キャリア層(20’)を結晶化させ、前記多結晶キャリア基材(20)を形成するステップと、
g)前記複合構造(1)の機械的処理及び/又は化学的処理のステップであって、前記機械的処理及び/又は前記化学的処理は、前記複合構造(1)の後面としての前記キャリア基材(20)の自由面、及び/又は前記複合構造(1)の前面としての前記薄層(10)の自由面に適用される、機械的処理及び/又は化学的処理のステップと、
を含む、作成するプロセス。 - 前記ステップd)が、100℃と700℃との間の温度で実施される、請求項1に記載の作成するプロセス。
- 前記ステップd)が、1Torrと500Torrとの間の圧力で実施される、請求項1又は2に記載の作成するプロセス。
- 前記ステップd)の間に使用される前駆物質が、ポリシリルエチレン及びジシラブタンから選択される、請求項1~3のいずれか一項に記載の作成するプロセス。
- 前記ステップd)の終了時に、前記キャリア層(20’)が、10ミクロン以上の厚さを有する、請求項1~4のいずれか一項に記載の作成するプロセス。
- 化学的エッチング、機械的研削、及び/又は機械的化学的研磨が、ステップd)とステップe)との間で、前記キャリア層(20’)の自由面に適用される、請求項1~5のいずれか一項に記載の作成するプロセス。
- ステップa)が、前記初期基材(11)の基底平面転位欠陥を貫通刃状転移欠陥に変換するために、前記初期基材(11)上での単結晶変換層(13)の形成を含む、請求項1~6のいずれか一項に記載の作成するプロセス。
- 前記ステップb)が、1200℃より高い温度で実施される、請求項1~7のいずれか一項に記載の作成するプロセス。
- 前記ステップe)が、ステップd)の堆積温度より高い温度で実施される、請求項1~8のいずれか一項に記載の作成するプロセス。
- 前記ステップe)が、前記ステップd)の間に起こる、請求項1~8のいずれか一項に記載の作成するプロセス。
- 前記ステップe)及び前記ステップf)が、同じ熱処理中に実施される、請求項1~9のいずれか一項に記載の作成するプロセス。
- ステップg)が、前記複合構造(1)の前面及び後面の機械的化学的同時研磨を含む、請求項1~11のいずれか一項に記載の作成するプロセス。
- 初期基材として又はドナー基材として再使用するために、前記ドナー基材の前記残余物(111’)を再調節するステップを含む、請求項1~12のいずれか一項に記載の作成するプロセス。
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