JP5189681B2 - 半導体発光素子製造用支持基板及びこの支持基板を用いた半導体発光素子 - Google Patents
半導体発光素子製造用支持基板及びこの支持基板を用いた半導体発光素子 Download PDFInfo
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- JP5189681B2 JP5189681B2 JP2011512377A JP2011512377A JP5189681B2 JP 5189681 B2 JP5189681 B2 JP 5189681B2 JP 2011512377 A JP2011512377 A JP 2011512377A JP 2011512377 A JP2011512377 A JP 2011512377A JP 5189681 B2 JP5189681 B2 JP 5189681B2
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Description
(半導体発光素子製造用支持基板の第1製造例)
以下、図5を参照して本発明の好ましい実施例による半導体発光素子製造用支持基板の構造及び製造過程について順次説明する。
500、犠牲層510、ヒートシンク層520、及びボンディング層530を具備する。上述した構造を有する半導体発光素子製造用支持基板50の製造工程は、a.選択支持基板を準備する段階と、b.犠牲層を形成する段階と、c.ヒートシンク層を形成する段階と、d.ボンディング層を形成する段階と、を含む。図5の(a)に示すように、本発明の好ましい実施例による半導体発光素子製造用支持基板50は選択支持基板500の上部に基本的に三層で構成されている。すなわち、電気伝導体である選択支持基板500の上部に犠牲層510、ヒートシンク層520、ボンディング層530が順次積層されている。
以下、本発明の他の実施例による半導体発光素子製造用支持基板について説明する。
(半導体発光素子の第1製造例)
以下、図9及び図10を参照して半導体発光素子製造用支持基板の第1製造例による半導体発光素子製造用支持基板を用いた半導体発光素子及びその製造方法について説明する。
以下、図11及び図12を参照して本発明による半導体発光素子製造用支持基板を用いた半導体発光素子の第1実施例の構造及び製造過程について具体的に説明する。
図12の(a)を参照すると、上記a段階である第1ウェハを準備する段階は、グループ3−5族窒化物系半導体からなる多層発光構造体薄膜を、LLO工程を用いて成長基板から分離(lift−off)するために、良質の半導体単結晶多層薄膜を必ず透明なサファイア成長基板に積層成長させる。一般的にグループ3−5族窒化物系半導体薄膜成長装備であるMOCVD及びMBEシステムを用いて、サファイアからなる最初成長基板1200の上部に発光素子の基本的な多層発光構造体薄膜である低温及び高温バッファ層1210、n型半導体クラッド層1220、発光活性層1230、及びp型半導体クラッド層1240を順次積層成長させる。
以下、図13及び図14を参照して本発明による半導体発光素子製造用支持基板を用いた半導体発光素子の第2実施例の構造及び製造過程について具体的に説明する。
以下、図15及び図16を参照して本発明による半導体発光素子製造用支持基板を用いた半導体発光素子の第3実施例の構造及び製造過程について具体的に説明する。
50、52、54、56、58 半導体発光素子製造用支持基板
60: 62: 64: 66: 68 半導体発光素子製造用支持基板
70、90、1100、1300、1500 半導体発光素子
871、1271、1471 トレンチ
881、1281、1481、1681 半導体発光素子製造用支持基板
Claims (24)
- 電気絶縁性の物質で形成された選択支持基板と、
前記選択支持基板の上部に積層されて形成される犠牲層と、
前記犠牲層の上部に積層されて形成され、熱的及び電気的伝導率が高い金属、合金、または固溶体で形成されるヒートシンク層と、
前記ヒートシンク層の上部に積層されて形成されるボンディング層と、を含み、
垂直構造の半導体発光素子の支持基板に用いられることを特徴とする半導体発光素子製造用支持基板。 - 前記選択支持基板の電気絶縁性物質は、最初成長基板との熱膨脹係数の差が2ppm 以下であることを特徴とする請求項1に記載の半導体発光素子製造用支持基板。
- 前記選択支持基板の電気絶縁性物質は、サファイア(Al2O3)、窒化アルミニウム(AlN)、MgO、AlSiC、BN、BeO、TiO2、SiO2及びガラスからなる群より選択される単結晶、多結晶または非晶質物質であることを特徴とする請求項1に記載の半導体発光素子製造用支持基板。
- 前記犠牲層は、
(i)GaN、InGaN、ZnO、InN、In2O3、ITO、SnO2、Si3N4、SiO2、BeMgO及びMgZnOからなる群より選択される1つまたは2つ以上の物質であって、窒素または酸素と結合された単結晶、多結晶または非晶質状の物質、
(ii)化学的エッチングにより除去可能な物質で形成された場合、化学的エッチングが可能である金属、合金、固溶体、酸化物、窒化物及び高温性有機物からなる群より選択される1つまたは2つ以上の物質、
(iii)耐熱性接着物質で形成された場合、耐熱性接着剤、シリコン接着剤及びポリビニルブチラールレジンからなる群より選択される1つまたは2つ以上の物質、
(iv)SOG薄膜である場合、シリケートまたはシロキサンタイプである物質、
(v)SODである場合、シリケート、シロキサン、メチルシルセスキオキサン(MSQ)、水素シルセスキオキサン(HSQ)、MQS+HSQ、パーヒドロシラザン(TCPS)及びポリシラザンからなる群より選択される1つまたは2つ以上の物質、または、
(vi)フォトレジストで形成された場合、AZ系列、SU−8系列、TLOR系列、TDMR系列、及びGXR系列からなる群より選択される1つまたは2つ以上の物質、
であることを特徴とする請求項1に記載の半導体発光素子製造用支持基板。 - 前記ヒートシンク層の厚さは、0.1マイクロメートル乃至500マイクロメートルであることを特徴とする請求項1に記載の半導体発光素子製造用支持基板。
- 前記ヒートシンク層を構成する金属、合金または固溶体は、Cu、Ni、Ag、Mo、Al、Au、Nb、W、Ti、Cr、Ta、Al、Pd、Pt及びSiからなる群より選択される1つまたは2つ以上の成分を含むことを特徴とする請求項1に記載の半導体発光素子製造用支持基板。
- 前記ボンディング層は、Ga、Bi、In、Sn、Pb、Au、Al、Ag、Cu、Ni、Pd、Si及びGeからなる群より選択される1つまたは2つ以上の成分を含むソルダリングまたはブレイジング用合金物質であることを特徴とする請求項1に記載の半導体発光素子製造用支持基板。
- 前記選択支持基板の上部に積層形成されたボンディング層は、物理蒸着法、化学蒸着法または電気化学蒸着法により形成され、
前記犠牲層は、E−ビーム蒸着法、熱蒸着法、MOCVD、スパッタリング及びPLD法からなる群より選択される方法により形成され、
前記ヒートシンク層は、電気メッキ法または非電気メッキ法により形成されることを特徴とする請求項1に記載の半導体発光素子製造用支持基板。 - 前記半導体発光素子製造用支持基板の犠牲層、ヒートシンク層及びボンディング層のうちの少なくとも1つの層が選択的に所定の形状にパターニングされるか、
前記半導体発光素子製造用支持基板の犠牲層、ヒートシンク層及びボンディング層のすべてが所定の形状にパターニングされ、選択支持基板も所定の深さにエッチングされることを特徴とする請求項1に記載の半導体発光素子製造用支持基板。 - 前記犠牲層は、湿式エッチング溶液に溶解されることを特徴とする請求項1に記載の半導体発光素子製造用支持基板。
- (a)最初成長基板の上部に半導体多層発光構造体が積層成長された第1ウェハを準備する段階と、
(b)半導体発光素子製造用支持基板である第2ウェハを準備する段階と、
(c)前記第1ウェハの上部に前記第2ウェハをボンディングする段階と、
(d)前記ボンディングの結果物から第1ウェハの最初成長基板を分離する段階と、
(e)前記最初成長基板が分離された第1ウェハの上部に第1オーミック接触電極を形成してパシベーションする段階と、
(f)前記パシベーションの結果物を切断して単一チップに製作する段階と、を含み、
前記第2ウェハの半導体発光素子製造用支持基板は、選択支持基板上に犠牲層、ヒートシンク層及びボンディング層が順次積層されて形成されることを特徴とする半導体発光素子の製造方法。 - 前記(a)段階での前記半導体多層発光構造体は、n型半導体クラッド層、発光活性層、p型半導体クラッド層を具備することを特徴とする請求項11に記載の半導体発光素子の製造方法。
- 前記(a)段階での半導体多層発光構造体をなす各層は、Inx(GayAl1−y)N(1≧x≧0、1≧y≧0、x+y>0)の組成を有する単結晶からなることを特徴とする請求項11または請求項12に記載の半導体発光素子の製造方法。
- 前記(c)段階でのウェハボンディングは、熱―圧縮ボンディング方法を用い、前記熱―圧縮ボンディング方法は100乃至600℃の温度で、1乃至200MPaの圧力で行われることを特徴とする請求項11に記載の半導体発光素子の製造方法。
- 前記(d)段階でのボンディングの結果物から第1ウェハの最初成長基板を分離する方法は、レーザビームを前記最初成長基板の面に照射するレーザリフトオフ方法、機械-化学的研磨方法及び湿式エッチング溶液を用いた湿式エッチング方法からなる群より選択される方法で行われることを特徴とする請求項11に記載の半導体発光素子の製造方法。
- 前記(f)段階で最終的に単一チップを製作する段階は、
(f1)半導体発光素子製造用支持基板の正反対方向に有機または無機ボンディング物質で形成された臨時の支持基板を付着する段階と、
(f2)前記犠牲層として用いられた物質に合わせて適当な吸収波長帯を有するレーザビームを含む電磁気光を選択して前記犠牲層を熱―化学分解反応させることで前記選択支持基板を分離除去する段階と、
(f3)ヒートシンク層の厚さが既に設定された値よりも厚い場合には、別途の支持基板の接合工程なしで前記結果物を垂直方向に切断し、
ヒートシンク層の厚さが既に設定された値よりも薄い場合には、電気伝導性金属、固溶体または合金からなるボンディング層を追加で形成し、前記追加されたボンディング層を用いて第3支持基板を前記ヒートシンク層に接合させる段階を経てその結果物を垂直方向に切断する段階と、を行うことにより単一チップの半導体発光素子を得ることを特徴とする請求項11に記載の半導体発光素子の製造方法。 - 前記半導体発光素子製造用支持基板のヒートシンク層の厚さは80マイクロメートル乃至500マイクロメートルであることを特徴とする請求項16に記載の半導体発光素子の製造方法。
- 前記第3支持基板は、熱的及び電気的に伝導性を有するSi、Ge、SiGe、ZnO、GaN、AlGaN及びGaAsからなる群より選択される1つまたは2つ以上の成分を含む単結晶または多結晶ウェハからなるか、Mo、Cu、Ni、Nb、Ta、Ti、Au、Ag、Cr、NiCr、CuW、CuMo及びNiWからなる群より選択される成分を含む金属、合金、または固溶体ホイルで形成されることを特徴とする請求項16に記載の半導体発光素子の製造方法。
- 前記(e)段階での第1オーミック接触電極を形成する物質は、 Al、Ti、Cr、Ta、Ag、Al、Rh、Pt、Au、Cu、Ni、Pd、In、La、Sn、Si、Ge、Zn、Mg、NiCr、PdCr、CrPt、NiTi、TiN、CrN、SiC、SiCN、InN、AlGaN、InGaN、希土類金属及び合金、金属シリサイド、半導体シリサイド、CNTNs、透明伝導性酸化物(TCO)及び透明伝導性窒化物(TCN)からなる群より選択される1つまたは2つ以上を含む物質で形成されることを特徴とする請求項11に記載の半導体発光素子の製造方法。
- 前記(a)段階での第1ウェハは、成長基板の上部に積層成長された半導体多層発光構造体の上部に光学的な反射層、電気絶縁層、拡散障壁層、ヒートシンク層、またはボンディング層を形成して準備することを特徴とする請求項11に記載の半導体発光素子の製造方法。
- 前記半導体多層発光構造体の上部に形成された光学的な反射層、電気絶縁層、拡散障壁層、ヒートシンク層またはボンディング層は、物理蒸着法、化学蒸着法、電気メッキ法または非電気メッキ法で形成されることを特徴とする請求項20に記載の半導体発光素子の製造方法。
- 前記第2ウェハでの選択支持基板上に積層される犠牲層は、湿式エッチング溶液に溶解される物質からなり、
前記(f)段階で前記半導体発光素子製造用支持基板の犠牲層を湿式エッチング溶液に溶解させることにより湿式エッチングして前記選択支持基板を分離及び除去した後に、その結果物を切断して単一チップを得ることを特徴とする請求項11に記載の半導体発光素子の製造方法。 - 前記(e)段階での第1オーミック接触電極は、第1ウェハのバッファ層またはn型半導体クラッド層の上面に形成することを特徴とする請求項11に記載の半導体発光素子の製造方法。
- 前記第2ウェハの半導体発光素子製造用支持基板は、請求項1から請求項10までのいずれか1項に記載の半導体発光素子製造用支持基板であることを特徴とする請求項11に記載の半導体発光素子の製造方法。
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US9224910B2 (en) | 2015-12-29 |
CN104538507A (zh) | 2015-04-22 |
CN104538507B (zh) | 2017-08-15 |
CN102106006A (zh) | 2011-06-22 |
JP2011522436A (ja) | 2011-07-28 |
US20110127567A1 (en) | 2011-06-02 |
JP2013070111A (ja) | 2013-04-18 |
EP2302705A2 (en) | 2011-03-30 |
WO2009148253A2 (ko) | 2009-12-10 |
CN102106006B (zh) | 2014-12-10 |
EP2302705B1 (en) | 2018-03-14 |
EP2302705A4 (en) | 2014-10-08 |
US8877530B2 (en) | 2014-11-04 |
US20140377895A1 (en) | 2014-12-25 |
US20140065746A1 (en) | 2014-03-06 |
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