JP2011223049A - 高光抽出led用の基板除去方法 - Google Patents
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Abstract
【解決手段】発光ダイオード(LED)を製造する方法は、基板ウェハ上に複数のLEDを設けるステップを含み、各LEDはSiC基板上に形成された第III族窒化物材料のn型およびp型層を有し、n型層は基板とp型層の間に挟まれる。LEDを保持するための外側面を有する導電性キャリアが用意される。LEDは、導電性キャリアの外側面上にフリップチップ実装される。LEDからSiC基板は取り除かれ、n型層が最上層となる。LEDのそれぞれのn型層上にそれぞれのコンタクトが堆積され、キャリアは各部分に分離され、それによりLEDが他から分離され、LEDのそれぞれが前記キャリアのそれぞれの部分に取り付けられるようになる。
【選択図】図1
Description
Claims (39)
- 半導体ベースの発光素子を製造する方法であって、
炭化珪素(SiC)基板ウェハ上に複数の半導体層を設けるステップであって、前記複数の半導体層は複数の発光素子用であり、前記発光素子のそれぞれはエピタキシャル層を備える、複数の半導体層を設けるステップと、
キャリアを用意するステップと、
前記発光素子が、前記キャリアと基板ウェハの間に挟まれるように、前記発光素子を、前記キャリア上にフリップチップ実装するステップと、
前記発光素子から、前記SiC基板ウェハを取り除くステップと、
前記発光素子のそれぞれが他から分離され、前記発光素子のそれぞれが前記キャリアのそれぞれの部分に取り付けられるように、前記キャリアを各部分に分離するステップと
を含むことを特徴とする方法。 - 前記複数の半導体層は、前記フリップチップ実装の前に、前記SiC基板上の個々の発光素子に分離されることを特徴とする請求項1に記載の方法。
- 前記複数の半導体層は、前記フリップチップ実装の後で、かつ前記SiC基板の前記除去の後に、前記キャリア上の個々の発光素子に分離されることを特徴とする請求項1に記載の方法。
- 前記発光素子のそれぞれは、半田によって前記キャリアに取り付けられることを特徴とする請求項1に記載の方法。
- 前記分離された素子およびその導電性キャリアのそれぞれを、素子パッケージに取り付けるステップをさらに含むことを特徴とする請求項1に記載の方法。
- 前記分離された素子のそれぞれは、銀エポキシまたは、半田を用いてパッケージに取り付けられることを特徴とする請求項5に記載の方法。
- 前記素子は、封止材料中に入れられることを特徴とする請求項5に記載の方法。
- 前記封止材料は、エポキシを含むことを特徴とする請求項7に記載の方法。
- 前記素子から前記基板ウェハを取り除く前記ステップは、前記基板ウェハを機械研削するステップを含むことを特徴とする請求項1に記載の方法。
- 前記素子から前記基板ウェハを取り除く前記ステップは、前記基板ウェハの一部分を機械研削するステップと、前記基板ウェハの残りを、前記基板ウェハの残りへのエッチングにさらすステップとを含むことを特徴とする請求項1に記載の方法。
- 前記素子から前記基板ウェハを取り除く前記ステップは、前記基板ウェハをエッチングにさらすステップを含むことを特徴とする請求項1に記載の方法。
- 前記半導体素子のそれぞれは、前記基板とエピタキシャル層の間に、リフトオフ層をさらに備えることを特徴とする請求項1に記載の方法。
- 前記素子のそれぞれから前記基板を取り除く前記ステップは、前記リフトオフ層を光電気化学エッチングにさらすステップを含むことを特徴とする請求項10に記載の方法。
- 前記素子のそれぞれから前記基板を取り除く前記ステップは、前記リフトオフ層を溶液にさらし、かつ光源を当てるステップであって、前記溶液と光源の組合せが、周囲の材料をエッチングせずに、前記リフトオフ層をエッチングさせる、ステップを含むことを特徴とする請求項12に記載の方法。
- 前記リフトオフ層はInGaN、AlInGaN、およびAlInGaAsの群からの材料を含み、前記溶液はKOHと水を含み、前記光源の波長は約400ナノメートル(nm)であることを特徴とする請求項12に記載の方法。
- 前記素子のそれぞれから前記基板を取り除く前記ステップは、前記素子に、前記基板およびエピタキシャル構造体には透明であるが、前記リフトオフ層には吸収されるレーザ光源を当てるステップを含むことを特徴とする請求項12に記載の方法。
- 前記基板はSiCを含み、前記エピタキシャル構造体はGaNを含み、前記リフトオフ層はInGaN、AlInGaN、およびAlInGaAsの群からの材料を含み、かつ前記リフトオフ層を取り除くステップは、波長が約390から450nmの範囲内のレーザ光によって前記素子を照射するステップを含むことを特徴とする請求項12に記載の方法。
- 前記レーザ光の波長は、約400nmであることを特徴とする請求項17に記載の方法。
- 前記基板は炭化珪素であり、前記エピタキシャル層は第III族窒化物であり、前記素子のそれぞれから前記各基板を取り除く前記ステップは、前記素子を三フッ化窒素エッチングにさらすステップを含むことを特徴とする請求項1に記載の方法。
- 前記キャリアを各部分に分離する前記ステップは、前記キャリアをダイシングするステップを含むことを特徴とする請求項1に記載の方法。
- 前記キャリアを各部分に分離する前記ステップは、前記キャリアに刻み目を付けるステップと、次いで前記刻み目に沿って前記キャリアを割るステップとを含むことを特徴とする請求項1に記載の方法。
- 前記複数の半導体発光素子それぞれは、炭化珪素(SiC)基板上に形成された第III族窒化物エピタキシャル層を有する、発光ダイオード(LED)を備えることを特徴とする請求項1に記載の方法。
- 前記キャリアは、前記半導体発光素子のそれぞれから前記キャリアに向かって放出される光を反射するために、反射層をさらに備えることを特徴とする請求項1に記載の方法。
- 前記半導体発光素子のそれぞれは、光抽出を高めるために、1つまたは複数のテクスチャ付き表面をさらに備えることを特徴とする請求項1に記載の方法。
- 前記キャリアは接合ダイオードをさらに備え、前記分離された素子のそれぞれは前記ダイオードの一部分を有し、静電放電による損傷から前記素子を保護するために、前記素子のそれぞれが前記ダイオード部分に結合されることを特徴とする請求項1に記載の方法。
- 前記キャリアは、導電性材料から作製されることを特徴とする請求項1に記載の方法。
- 前記キャリアは半導体材料から作製され、前記キャリアは導電性材料の1つまたは複数の層をさらに備えることを特徴とする請求項1に記載の方法。
- 発光ダイオード(LED)を製造する方法であって、
SiC基板ウェハ上に複数の半導体層を設けるステップであって、前記半導体層は複数のLEDを形成し、前記LEDのそれぞれはn型層およびp型層を有し、前記n型層は前記基板ウェハとp型層の間に挟まれる、複数の半導体層を設けるステップと、
前記LEDを保持するための外側面を有するキャリアを用意するステップと、
前記LEDが、前記基板ウェハと前記キャリアの間に挟まれるように、前記LEDを、前記キャリア外側面上にフリップチップ実装するステップと、
前記n型層が最上層になるように、前記LEDから前記SiC基板を取り除くステップと、
前記LEDのそれぞれの前記n型層上に、それぞれのコンタクトを堆積させるステップと、
前記LEDのそれぞれが他から分離され、前記LEDのそれぞれが前記キャリアのそれぞれの部分に取り付けられるように、前記キャリアを各部分に分離するステップと
を含むことを特徴とする方法。 - 前記LEDのそれぞれは、光を反射するために、複数の金属層をさらに備えることを特徴とする請求項28に記載の方法。
- 前記LEDのそれぞれのための前記金属層が、前記p型層と前記キャリアの間にあることを特徴とする請求項29に記載の方法。
- 前記LEDのそれぞれから前記各基板を取り除く前記ステップが、前記基板のそれぞれを機械研削するステップを含むことを特徴とする請求項28に記載の方法。
- 前記機械研削後に前記素子上に残る前記基板のそれぞれを取り除くために、前記素子のそれぞれを、フッ素ベースのプラズマエッチングにさらすステップをさらに含むことを特徴とする請求項31に記載の方法。
- 前記LEDのそれぞれは前記基板と前記n型層の間のリフトオフ層をさらに備え、前記LEDのそれぞれから前記基板を取り除く前記ステップは、前記リフトオフ層を取り除くステップを含むことを特徴とする請求項28に記載の方法。
- 前記リフトオフ層は、前記リフトオフ層を光電気化学エッチングにさらすステップと、前記リフトオフ層をエッチング溶液にさらし、光を当てるステップと、前記リフトオフ層にレーザ光源を当てるステップからなる群からの方法の1つによって取り除かれることを特徴とする請求項28に記載の方法。
- 前記LEDのそれぞれから前記各基板を取り除く前記ステップは、前記基板を三フッ化窒素エッチングにさらすステップを含むことを特徴とする請求項28に記載の方法。
- 前記キャリアを各部分に分離する前記ステップは、前記キャリアをダイシングするステップ、すなわち前記キャリアに刻み目を付け、次いで前記刻み目に沿って前記キャリアを割るステップを含むことを特徴とする請求項28に記載の方法。
- 前記キャリアは、前記LEDのそれぞれから前記キャリアに向かって放出される光を、反射するために、反射層をさらに備えることを特徴とする請求項28に記載の方法。
- 前記LEDのそれぞれは、光抽出を高めるために、1つまたは複数のテクスチャ付き表面をさらに備えることを特徴とする請求項28に記載の方法。
- 前記キャリアは接合ダイオードをさらに備え、前記分離されたLEDのそれぞれが前記接合ダイオードの一部分を有し、静電放電による損傷から前記素子を保護するために、前記LEDのそれぞれが前記接合ダイオードの部分に結合されることを特徴とする請求項28に記載の方法。
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DE112005003476T5 (de) | 2008-01-17 |
US20060189098A1 (en) | 2006-08-24 |
JP2008532281A (ja) | 2008-08-14 |
TW200631200A (en) | 2006-09-01 |
US9559252B2 (en) | 2017-01-31 |
JP5676396B2 (ja) | 2015-02-25 |
US20110198626A1 (en) | 2011-08-18 |
WO2006091242A1 (en) | 2006-08-31 |
US7932111B2 (en) | 2011-04-26 |
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