JP5630579B2 - 半導体装置および半導体装置の製造方法 - Google Patents
半導体装置および半導体装置の製造方法 Download PDFInfo
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- JP5630579B2 JP5630579B2 JP2013519318A JP2013519318A JP5630579B2 JP 5630579 B2 JP5630579 B2 JP 5630579B2 JP 2013519318 A JP2013519318 A JP 2013519318A JP 2013519318 A JP2013519318 A JP 2013519318A JP 5630579 B2 JP5630579 B2 JP 5630579B2
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Description
(特徴1)重金属を含む電極は、ダイオード素子領域内のアノード層の一部と接触している。
(特徴2)重金属を含む電極は、ダイオード素子領域内のカソード領域の一部と接触している。
(特徴3)第1トレンチ電極の深さに比して、第2トレンチ電極の深さが深くされている。
(特徴4)IGBT素子領域は、プレーナ型の電極を備えている。
(特徴5)ウェハ保持台は、搬送ステージである。
(特徴6)重金属は、金、白金、銀、銅、クロム、カドミウム、水銀、亜鉛、ヒ素、マンガン、コバルト、ニッケル、モリブデン、タングステン等が用いられる。
A2=(D×t)1/2・・・式(1)
ここで、tは拡散時間、Dは拡散係数である。また、拡散係数Dは、下式(2)で求められる。
D=D0×exp(−Ea/k×T)・・・式(2)
ここで、D0(cm2/s)は拡散定数、Ea(eV)は活性化エネルギー、k(eV/K)はボルツマン定数、T(K)は絶対温度、である。式(1)および式(2)により、重金属の拡散距離A2は、第2電極6を形成した後の熱履歴と、物理定数により決定されることが分かる。
実施例1に係る半導体装置の変形例を、以下に説明する。図9に、半導体装置1dの一部断面図を示す。半導体装置1dは、IGBT素子領域J1内の第1トレンチ41の深さB1に比して、ダイオード素子領域J2内の第2トレンチ42の深さB2が深くされている点が、半導体装置1(図2)と異なっている。これにより、IGBT素子領域J1よりもダイオード素子領域J2の方が、深さ方向についても、より広い領域に熱応力を発生させることができる。よって、ダイオード素子領域J2に、より高密度で結晶欠陥を形成することができる。
実施例2に係る半導体装置の変形例を、以下に説明する。図6のステップS13において裏面研磨が行われた後において、重金属導入用の搬送ステージを使用する形態であってもよい。当該搬送ステージは、ウェハの裏面の全面と接触する保持面を備える、全面保持ステージである。また保持面は、重金属を含む材料で形成されている。これにより、ウェハの搬送時において、保持面とウェハ裏面とを接触させることで、ウェハ内に重金属を導入することができる。また、ウェハの全面を保持することでウェハに反りやたわみを発生させにくくすることができるため、大口径ウェハや薄化されたウェハを確実に搬送することが可能となる。なお、重金属導入用の搬送ステージを使用するタイミングは、ウェハ裏面の重金属ゲッタリング層が除去されてから、熱工程による重金属ゲッタリングが完了するまでの間であれば、何れのタイミングでもよい。
Claims (5)
- 同一半導体基板にIGBT素子領域とダイオード素子領域が混在している半導体装置であり、
IGBT素子領域では、第1導電型のコレクタ層と第2導電型のドリフト層と第1導電型のボディ層が順に積層されており、
ボディ層の表面からボディ層を貫通してドリフト層内に突出しているとともに絶縁膜で囲まれている第1トレンチ電極が形成されており、
その絶縁膜を介して第1トレンチ電極に接しているとともに半導体基板の表面に臨む範囲に第2導電型のエミッタ領域が形成されており、そのエミッタ領域がボディ層によってドリフト層から分離されており、
ダイオード素子領域では、第2導電型のカソード層と第2導電型のドリフト層と第1導電型のアノード層が順に積層されており、
アノード層の表面からアノード層を貫通してドリフト層内に突出しているとともに絶縁膜で囲まれている第2トレンチ電極が形成されており、
第1トレンチ電極の開口部が形成されているボディ層の表面、および、第2トレンチ電極の開口部が形成されているアノード層の表面を観測したときに、ダイオード素子領域の単位面積あたりの第2トレンチ電極の開口部を形成する開口部境界線の合計長さが、IGBT素子領域の単位面積あたりの第1トレンチ電極の開口部を形成する開口部境界線の合計長さに比して長くされており、
ダイオード素子領域のドリフト層に含まれる重金属の密度が、IGBT素子領域のドリフト層に含まれる重金属の密度に比して高いことを特徴とする半導体装置。 - 重金属を含む電極をさらに備え、
ダイオード領域内の半導体層の少なくとも一部と電極とが接触していることを特徴とする請求項1に記載の半導体装置。 - 重金属を含む電極とダイオード素子領域内の半導体層とが接触する接触領域と、IGBT素子領域内のエミッタ領域との間の第1距離が、ダイオード素子領域のアノード層の厚さとドリフト層の厚さの和によって定まる第2距離以上であることを特徴とする請求項2に記載の半導体装置。
- 同一半導体基板にIGBT素子領域とダイオード素子領域が混在している半導体装置の製造方法であって、
IGBT素子領域に第1トレンチ電極を形成する第1形成工程と、
ダイオード素子領域に第2トレンチ電極を形成する第2形成工程と、
重金属を含むウェハ保持台にウェハを接触させる接触工程と、
接触工程の後に、ウェハを加熱する加熱工程と、
を備え、
第1形成工程と第2形成工程が行われたウェハを表面から観測したときに、ダイオード素子領域の単位面積あたりの第2トレンチ電極の開口部を形成する開口部境界線の合計長さが、IGBT素子領域の単位面積あたりの第1トレンチ電極の開口部を形成する開口部境界線の合計長さに比して長くされており、
第1形成工程および第2形成工程は、加熱工程の前に行われることを特徴とする半導体装置の製造方法。 - ウェハの裏面を研磨する研磨工程をさらに備え、
研磨工程は、接触工程の前に行われることを特徴とする請求項4に記載の製造方法。
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