JP2019197924A - 半導体デバイスを支持基板に接合する方法 - Google Patents
半導体デバイスを支持基板に接合する方法 Download PDFInfo
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Abstract
Description
[(CTEgrowth−CTEstresscomp)(Tbond1−Troom )(Estresscomp)]/[(1−νstresscomp)(tstresscomp)]=[(CTEgrowth−CTEsupport)(Tbond2−Troom )(Esupport)]/[(1−νsupport)(tsupport)]であり、式中、CTEgrowthは、成長基板のCTE(サファイアでは約5.8ppm/℃)であり、CTEstresscompは、ストレス補償ウエハのCTE(Siでは約2.6ppm/℃)であり、CTEsupportは、支持基板ウエハのCTEであり、Troomは、室温、しばしば25℃であり、Tbond1は、デバイスウエハとストレス補償ウエハとの間のボンドの温度であり、Tbond2は、デバイスウエハと支持基板ウエハとの間のボンドの温度であり、Estresscompは、ストレス補償ウエハのヤング率であり、Esupportは、支持基板ウエハのヤング率であり、νstresscompは、ストレス補償ウエハのポアソン比であり、νsupportは、支持基板ウエハのポアソン比であり、tstresscompは、ストレス補償ウエハの厚さであり、tsupportは、支持基板ウエハの厚さである。スタックが、冷却中に平坦なままであるように、デバイスウエハ、支持基板ウエハ、及びストレス補償ウエハを含む接合されたスタックが、平衡を保たれたストレスを有するために、式(1)の両辺は、等しくなければならない。幾つかの実施形態において、小量のストレスが、接合されたスタックにおいて許容され得る。例えば、式1の両辺は、幾つかの実施形態において10%以下、幾つかの実施形態において5%以下、また幾つかの実施形態において1%以下異なっても良い。
Claims (16)
- 成長基板の半導体デバイスのウエハを提供することであって、前記ウエハは、第1の表面を有し、前記成長基板は、前記ウエハに面しない側の第2の表面を有することと、
前記第1の表面を、加熱しながら、前記ウエハとは異なる熱膨張係数(CTE)を有する第1のウエハに接合することと、
前記第2の表面を、加熱しながら、前記第1のウエハと同様の材料及び厚さを有する第2のウエハに接合することと、
前記第1のウエハと前記第2のウエハとに接合された前記ウエハが冷却されて実質的に曲がっていない接合スタックを形成することを可能にすることと、
前記冷却後に前記第2のウエハを除去することと、
を含む方法。 - 各半導体デバイスが、n型領域と、p型領域と、前記n型領域と直接接触したnコンタクトと、前記p型領域と直接接触したpコンタクトとを有し、前記第1の表面は、前記nコンタクト及び前記pコンタクトの表面であり、前記第1及び第2のウエハは各々、前記成長基板と異なる熱膨張係数を有する、請求項1に記載の方法。
- 前記第1の表面を前記第1のウエハに接合した後で、各半導体デバイスについて、前記nコンタクトを露出させるように、前記第1のウエハの全厚さを通して第1のビアをエッチングし、且つ前記pコンタクトを露出させるように、前記第1のウエハの全厚さを通して第2のビアをエッチングすることと、
前記第1及び第2のビアをエッチングした後で、前記第2のウエハを除去することと、
を更に含む請求項2に記載の方法。 - 前記nコンタクトが、前記n型領域のエッジを越えて延在して前記成長基板と直接接触する、請求項2に記載の方法。
- 前記nコンタクトが、前記n型領域のエッジから後退され、各半導体デバイスが更に、前記成長基板及び前記nコンタクトと直接接触して前記n型領域のエッジに配置された反射誘電体材料を有する、請求項2に記載の方法。
- 前記成長基板が、サファイアであり、前記第1及び第2のウエハが、シリコンである、請求項1に記載の方法。
- 前記第1の表面を第1のウエハに接合すること及び前記第2の表面を第2のウエハに接合することが、単一のボンディングステップで行われる、請求項1に記載の方法。
- 前記第1の表面を第1のウエハに接合することが、前記第2の表面を第2のウエハに接合することの前に行われる、請求項1に記載の方法。
- 前記第1の表面を第1のウエハに接合することが、前記第2の表面を第2のウエハに接合することの後に行われる、請求項1に記載の方法。
- 第1のボンディング層が、前記第1の表面と前記第1のウエハとの間に配置され、第2のボンディング層が、前記第2の表面と前記第2のウエハとの間に配置される、請求項1に記載の方法。
- 前記第1のボンディング層が、前記第2のボンディング層より高い温度で接合される、請求項10に記載の方法。
- 前記半導体デバイスは、n型領域とp型領域との間に挟まれたIII族窒化物発光層を含む、請求項1に記載の方法。
- 前記第2のウエハの厚さは、[(CTEgrowth−CTEsecond)(Tbond1−Troom)(Esecond)]/[(1−νsecond)(tsecond)]=[(CTEgrowth−CTEfirst)(Tbond2−Troom)(Efirst)]/[(1−νfirst)(tfirst)]を満たし、式中、CTEgrowthは、前記成長基板の熱膨張係数であり、CTEsecondは、前記第2のウエハの熱膨張係数であり、CTEfirstは、前記第1のウエハの熱膨張係数であり、Troomは、25℃であり、Tbond1は、前記半導体デバイスのウエハと前記第2のウエハとの間の前記接合のボンディング温度であり、Tbond2は、前記半導体デバイスのウエハと前記第1のウエハとの間の前記接合のボンディング温度であり、Esecondは、前記第2のウエハのヤング率であり、Efirstは、前記第1のウエハのヤング率であり、νsecondは、前記第2のウエハのポアソン比であり、νfirstは、前記第1のウエハのポアソン比であり、tsecondは、前記第2のウエハの厚さであり、tfirstは、前記第1のウエハの厚さである、請求項1に記載の方法。
- 前記第1のウエハは、集積回路素子を有する半導体ウエハである、請求項1乃至13のいずれか一項に記載の方法。
- 成長基板の半導体デバイスのウエハを提供することであって、前記ウエハは、第1の表面を有し、前記成長基板は、前記ウエハに面しない側の第2の表面を有することと、
前記第1の表面を、加熱しながら、前記ウエハとは異なる熱膨張係数(CTE)を有する第1のウエハに接合することと、
前記第2の表面を、加熱しながら、前記第1のウエハよりも低いCTEを有し且つ前記第1のウエハよりも厚い第2のウエハに接合することと、
前記第1のウエハと前記第2のウエハとに接合された前記ウエハが冷却されて実質的に曲がっていない接合スタックを形成することを可能にすることと、
前記冷却後に前記第2のウエハを除去することと、
を含む方法。 - 成長基板の半導体デバイスのウエハを提供することであって、前記ウエハは、第1の表面を有し、前記成長基板は、前記ウエハに面しない側の第2の表面を有することと、
前記第1の表面を、加熱しながら、前記ウエハとは異なる熱膨張係数(CTE)を有する第1のウエハに接合することと、
前記第2の表面を、加熱しながら、前記第1のウエハよりも高いCTEを有し且つ前記第1のウエハよりも薄い第2のウエハに接合することと、
前記第1のウエハと前記第2のウエハとに接合された前記ウエハが冷却されて実質的に曲がっていない接合スタックを形成することを可能にすることと、
前記冷却後に前記第2のウエハを除去することと、
を含む方法。
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