JP2014168078A - 金属支持膜を使用した縦方向デバイスの製作方法 - Google Patents
金属支持膜を使用した縦方向デバイスの製作方法 Download PDFInfo
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Abstract
【解決手段】半導体層120は、通常の技術を使用して絶縁基板上に作られる。誘導結合プラズマ反応性イオンエッチングによって、個々のデバイスの境界を画定するトレンチが、半導体層を通して絶縁基板中に形成されるのが好ましい。第1の支持構造200が半導体層に取り付けられる。硬い基板は、好ましくは導電性である第2の支持構造で置き換えられ、第1の支持構造が除去される。次に、好ましくは第2の支持構造を通してエッチングして、個々のデバイスはダイシングされる。保護フォトレジスト層196は、第1の支持構造が付着しないように半導体層を保護することができる。導電性下部コンタクト192(場合によっては、反射性)を、第2の支持構造と半導体層の間に挿入することができる。
【選択図】図10
Description
Claims (61)
- 縦形デバイスであって、
第1の表面および第2の表面を有する導電性付着構造体と、
前記第1の表面に形成された導電性厚膜支持体と、
上部電気コンタクトを有する、前記導電性付着層の上に位置づけされた半導体デバイスとを備え、
前記導電性厚膜と前記上部電気コンタクトの間を電流が流れることができる縦形デバイス。 - さらに、前記第2の表面と前記半導体デバイスの間に配置された反射コンタクト構造を含む、請求項1に記載の縦形デバイス。
- 前記反射コンタクト構造が、チタン層を含む、請求項2に記載の縦形デバイス。
- 前記反射コンタクト構造が、アルミニウム層をさらに含む、請求項3に記載の縦形デバイス。
- 前記半導体デバイスが、前記第2の表面に隣接したバッファ層を含む、請求項1に記載の縦形デバイス。
- 前記導電性付着構造体が、Cr付着層を含む、請求項1に記載の縦形デバイス。
- 前記導電性付着構造体が、Au付着層をさらに含む、請求項6に記載の縦形デバイス。
- 前記厚膜支持体は、厚さが100ミクロンよりも小さい、請求項1に記載の縦形デバイス。
- 前記厚膜支持体が、CuまたはAlを含む、請求項8に記載の縦形デバイス。
- 導電性付着層の上の上部電気コンタクト、およびエピタキシャルバッファ層を有する発光デバイスと、
前記エピタキシャルバッファ層に隣接した第1の側、および第2の側を有する導電性付着構造体と、
前記第2の側に形成された導電性厚膜とを備え、
前記導電性厚膜と前記上部電気コンタクトの間を電流が流れることができる縦形発光デバイス。 - 前記エピタキシャルバッファ層が、エピタキシャルGaN層を備える、請求項10に記載の縦形発光デバイス。
- 前記バッファ層上にn−GaN層を、前記n−GaN層上に能動層を、前記能動層上にp−GaN層をさらに含み、前記上部電気コンタクトが少なくとも前記p−GaN層上に設けられたp型コンタクトを含む、請求項11に記載の縦形発光デバイス。
- 前記能動層が、AlInGaNを含む、請求項12に記載の縦形発光デバイス。
- 前記能動層が、量子井戸を含む、請求項13に記載の縦形発光デバイス。
- 前記上部電気コンタクトが、さらに、前記p型コンタクトと前記p−GaN層の間に配置されたp透明コンタクトを備える、請求項12に記載の縦形発光デバイス。
- 前記エピタキシャルバッファ層と前記導電性付着構造体の間に配置された反射構造をさらに含む、請求項11に記載の縦形発光デバイス。
- 前記反射コンタクト構造が、チタン層を含む、請求項16に記載の縦形発光デバイス。
- 前記反射コンタクト構造が、アルミニウム層をさらに含む、請求項17に記載の縦形発光デバイス。
- 前記導電性付着構造体が、Cr付着層を含む、請求項10に記載の縦形発光デバイス。
- 前記導電性付着構造体が、Au付着層をさらに含む、請求項19に記載の縦形発光デバイス。
- 前記厚膜支持体は、厚さが約100ミクロンよりも小さい、請求項10に記載の縦形発光デバイス。
- 前記厚膜支持体が、CuまたはAlを含む、請求項21に記載の縦形発光デバイス。
- 半導体デバイスを製造する方法であって、
複数の半導体層を絶縁性基板の上にエピタキシャル成長するステップと、
前記複数の半導体層を通して、複数の個々の半導体デバイスを画定するように前記絶縁性基板中にトレンチを形成するステップと、
第1の電気コンタクトを各個々の半導体デバイスに形成するステップと、
第1の支持構造を前記第1の電気コンタクトの上に取り付けるステップと、
前記絶縁基板を前記エピタキシャル半導体層から除去するステップと、
前記除去された絶縁性基板の代わりに導電性の第2の支持構造を取り付けるステップと、
前記第1の支持構造を除去するステップとを備える方法。 - さらに、前記トレンチと位置合わせして前記導電性の第2の支持構造を通してエッチングするステップを含む、請求項23に記載の方法。
- さらに、個々の半導体デバイスを分離することを含む、請求項24に記載の方法。
- 個々の半導体デバイスの分離が、前記トレンチに応力を加えて行なわれる、請求項25に記載の方法。
- 個々の半導体デバイスの分離が、鋸引きで行なわれる、請求項25に記載の方法。
- 複数の半導体層の前記絶縁性基板上へのエピタキシャル成長が、GaNバッファ層をサファイア基板上に形成することを含む、請求項23に記載の方法。
- トレンチが、誘導結合プラズマ反応性イオンエッチング(ICP RIE)を使用して形成される、請求項23に記載の方法。
- 第1の支持構造の前記第1の電気コンタクト上への取り付けが、フォトレジスト層を前記第1の電気コンタクトの上に形成しそれから第1の支持構造を前記フォトレジスト層に結合することを含む、請求項23に記載の方法。
- 取り付けが、エポキシ接着剤を使用して行なわれる、請求項23に記載の方法。
- 前記絶縁性基板の前記エピタキシャル半導体層からの除去が、レーザリフトオフを使用して行なわれる、請求項23に記載の方法。
- レーザリフトオフが、
真空チャックの前記絶縁性基板への取り付け、
前記真空チャックおよび絶縁性基板を通してレーザ光を放射して、少なくとも1つのエピタキシャル半導体層を加熱すること、および、
前記絶縁性基板が前記エピタキシャル半導体層から離れるまで、レーザ照射中に前記絶縁性基板を前記エピタキシャル半導体層から取り外す方向のバイアス力を加えること、によって行なわれる、請求項32に記載の方法。 - 前記第2の支持構造の取り付けが、前記エピタキシャル半導体層に付着構造体を形成するステップを含む、請求項23に記載の方法。
- 前記第2の支持構造の取り付けが、前記付着構造体に導電性の第2の支持構造を形成するステップをさらに含む、請求項34に記載の方法。
- 前記付着構造体の形成が、Cr付着層の形成を含む、請求項23に記載の方法。
- 前記付着構造体の形成が、Au付着層の形成をさらに含む、請求項36に記載の方法。
- 導電性の第2の支持構造を形成するステップが、厚さが約100ミクロンよりも小さい導電性の第2の支持構造を形成する、請求項34に記載の方法。
- 導電性の第2の支持構造を形成するステップが、Cuの導電性の第2の支持構造を形成する、請求項38に記載の方法。
- 導電性の第2の支持構造を形成するステップが、Alの導電性の第2の支持構造を形成する、請求項38に記載の方法。
- 導電性の第2の支持構造を形成するステップが、前記付着構造体と前記エピタキシャル半導体層の間に配置された反射層を形成するステップを含む、請求項23に記載の方法。
- 前記第1の支持構造を除去することが、加熱とリフトオフのステップを含む、請求項23に記載の方法。
- 発光ダイオードの製造方法であって、
絶縁性基板上にGaNバッファ層、前記GaNバッファ層上に第1のドープされたGaN層、前記第1のドープされたGaN層上に能動層、および前記能動層上に第2のGaN層を含んだ複数の半導体層を、前記絶縁性基板上に形成するステップと、
前記複数の半導体層を通して、複数の個々の発光ダイオードを画定するように前記絶縁性基板中にトレンチを形成するステップと、
第1の電気コンタクトを各個々の発光ダイオードに形成するステップと、
第1の支持構造を前記個々の発光ダイオードに取り付けるステップと、
前記絶縁性基板を前記複数の半導体層から除去するステップと、
前記除去された絶縁性基板の代わりに導電性の第2の支持構造を取り付けるステップと、
前記第1の支持構造を除去するステップとを備える方法。 - 前記絶縁性基板がサファイアである、請求項43に記載の発光ダイオードの製造方法。
- 前記能動層が、AlInGaNを含む、請求項43に記載の発光ダイオードの製造方法。
- さらに、前記トレンチと位置合わせして前記導電性の第2の支持構造を通してエッチングするステップを含む、請求項43に記載の方法。
- さらに、個々の半導体デバイスを分離することを含む、請求項46に記載の方法。
- トレンチが、誘導結合プラズマ反応性イオンエッチング(ICP RIE)を使用して形成される、請求項43に記載の方法。
- 第1の支持構造を前記個々の発光ダイオードの上に取り付けることが、フォトレジスト層を前記個々の発光ダイオードの上に形成しそれから前記第1の支持構造を前記フォトレジスト層に結合することを含む、請求項43に記載の方法。
- 結合することが、エポキシを使用して行なわれる、請求項49に記載の方法。
- 前記絶縁性基板を除去することが、レーザリフトオフで行なわれる、請求項33に記載の方法。
- レーザリフトオフが、
真空チャックを前記絶縁性基板に取り付けること、
前記真空チャックおよび絶縁性基板を通してレーザ光を放射して、少なくとも1つの半導体層を加熱すること、および、
前記絶縁性基板が離れるまで、レーザ照射中に、前記絶縁性基板を取り外す傾向があるバイアス力を加えること、によって行なわれる、請求項51に記載の方法。 - 前記導電性の第2の支持構造を取り付けることが、導電性付着構造体を形成するステップを含む、請求項43に記載の方法。
- 前記導電性の第2の支持構造を取り付けることが、さらに、前記導電性の第2の支持構造を前記導電性付着構造体上に形成するステップを含む、請求項53に記載の方法。
- 前記導電性付着構造体を形成することが、Cr付着層を形成することを含む、請求項43に記載の方法。
- 前記導電性付着構造体を形成することが、Au付着層を形成することをさらに含む、請求項55に記載の方法。
- 前記導電性の第2の支持構造を形成する前記ステップが、厚さが約100ミクロンより小さい導電性の第2の支持構造を形成する、請求項54に記載の方法。
- 導電性の第2の支持構造を形成する前記ステップが、Cuの導電性の第2の支持構造を形成する、請求項54に記載の方法。
- 導電性の第2の支持構造を形成する前記ステップが、Alの導電性の第2の支持構造を形成する、請求項55に記載の方法。
- 導電性の第2の支持構造を形成する前記ステップが、前記付着構造体と前記エピタキシャル半導体層の間に配置された反射層を形成するステップを含む、請求項53に記載の方法。
- 前記第1の支持構造を除去することが、加熱とリフトオフのステップを含む、請求項43に記載の方法。
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