JPWO2005038936A1 - 発光素子及びその製造方法 - Google Patents
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Abstract
Description
III−V族化合物半導体からなる発光層部と、該発光層部の少なくとも一方の主表面側に形成され、発光層部からの発光光束のピーク波長に相当する光量子エネルギーよりも大きなバンドギャップエネルギーを有するIII−V族化合物半導体からなる厚さ10μm以上の透明厚膜半導体層とを有し、
透明厚膜半導体層の側面部が化学エッチング面とされ、かつ、該透明厚膜半導体層中に、ドーパント濃度が5×1016/cm3以上2×1018/cm3以下に制御されたドーピング制御領域が10μm以上の厚さにて形成されてなることを特徴とする。
III−V族化合物半導体からなる発光層部と、該発光層部の少なくとも一方の主表面側に形成され、発光層部からの発光光束のピーク波長に相当する光量子エネルギーよりも大きなバンドギャップエネルギーを有するIII−V族化合物半導体からなる厚さ10μm以上の透明厚膜半導体層とを有するウェーハを作製し、該ウェーハをダイシングして個々の素子チップに分離するとともに、
該透明厚膜半導体層中に、ドーパント濃度が5×1016/cm3以上2×1018/cm3以下に制御されたドーピング制御領域を10μm以上の厚さにて形成し、ダイシング後において該透明厚膜半導体層の側面部に形成された加工ダメージ層を化学エッチングにより除去することを特徴とする。
(1)第一導電型クラッド層上に、該第一導電型クラッド層と異なる組成の化合物半導体により第二主表面側の透明厚膜半導体層よりも薄い電流拡散層を形成する。該電流拡散層は、第一導電型クラッド層よりも有効キャリア濃度を高めておくことで、電流拡散効果をより顕著なものとすることができる。
(2)第一導電型クラッド層が第二導電型クラッド層よりも厚く、かつ透明厚膜半導体層よりも薄く形成する。この場合、第一導電型クラッド層の第一主表面側の部分が電流拡散層の役割を果たしていると見ることもでき、該部分の有効キャリア濃度を残余の部分よりも高めておくことで、電流拡散効果をより顕著なものとすることができる。
図1は、本発明の一実施形態である発光素子100を示す概念図である。発光素子100は、III−V族化合物半導体からなる発光層部24と、該発光層部24の第二主表面側に形成され、発光層部24からの発光光束のピーク波長に相当する光量子エネルギーよりも大きなバンドギャップエネルギーを有するIII−V族化合物半導体からなる透明厚膜半導体層90とを有する。
まず、図2の工程1に示すように、成長用基板としてn型のGaAs単結晶基板1を用意する。次に、工程2に示すように、その基板1の一方の主表面に、n型GaAsバッファ層2を例えば0.5μm、さらにn型AlGaAs電流拡散層91を例えば5μmにてエピタキシャル成長させる。
・Al源ガス;トリメチルアルミニウム(TMAl)、トリエチルアルミニウム(TEAl)など;
・Ga源ガス;トリメチルガリウム(TMGa)、トリエチルガリウム(TEGa)など;
・In源ガス;トリメチルインジウム(TMIn)、トリエチルインジウム(TEIn)など;
・P源ガス;トリメチルリン(TMP)、トリエチルリン(TEP)、ホスフィン(PH3)など。
Ga(液体)+HCl(気体) → GaCl(気体)+1/2H2‥‥(1)
GaPの場合、成長温度は例えば640℃以上860℃以下に設定する。また、V族元素であるPは、PH3をキャリアガスであるH2とともに基板上に供給する。さらに、p型ドーパントであるZnは、DMZn(ジメチルZn)の形で供給する。GaClはPH3との反応性に優れ、下記(2)式の反応により、効率よく透明厚膜半導体層90を成長させることができる。
GaCl(気体)+PH3(気体)
→GaP(固体)+HCl(気体)+H2(気体)‥‥(2)
Claims (11)
- III−V族化合物半導体からなる発光層部と、該発光層部の少なくとも一方の主表面側に形成され、前記発光層部からの発光光束のピーク波長に相当する光量子エネルギーよりも大きなバンドギャップエネルギーを有するIII−V族化合物半導体からなる厚さ10μm以上の透明厚膜半導体層とを有し、
前記透明厚膜半導体層の側面部が化学エッチング面とされ、かつ、該透明厚膜半導体層中に、ドーパント濃度が5×1016/cm3以上2×1018/cm3以下に制御されたドーピング制御領域が10μm以上の厚さにて形成されてなることを特徴とする発光素子。 - 前記透明厚膜半導体層の厚さが40μm以上であり、該透明厚膜半導体層中の前記ドーピング制御領域の厚さが40μm以上であることを特徴とする請求の範囲第1項に記載の発光素子。
- 前記発光層部の一方の主表面を第一主表面として、該第一主表面側に主光取り出し面が形成され、該主光取り出し面の一部を覆う形で光取り出し面側金属電極が配置されてなり、他方、前記透明厚膜半導体層が前記発光層部の第二主表面側にのみ設けられていることを特徴とする請求の範囲第1項又は第2項に記載の発光素子。
- 前記透明厚膜半導体層が前記発光層部の第一主表面側に配置され、該透明厚膜半導体層の第一主表面を主光取り出し面として、その一部を覆う形で光取り出し面側金属電極が配置されてなることを特徴とする請求の範囲第1項又は第2項に記載の発光素子。
- 前記発光層部の第二主表面側に金属反射層が配置されてなることを特徴とする請求の範囲第4項に記載の発光素子。
- 前記透明厚膜半導体層として、前記発光層部の第一主表面側に第一透明厚膜半導体層が、同じく第二主表面側に第二透明厚膜半導体層がそれぞれ設けられてなることを特徴とする請求の範囲第4項に記載の発光素子。
- 前記発光層部がAlGaInPからなるダブルへテロ構造を有し、前記透明厚膜半導体層がGaP、GaAsP及びAlGaAsのいずれかからなることを特徴とする請求の範囲第1項ないし第6項のいずれか1項に記載の発光素子。
- 前記透明厚膜半導体層は前記発光層部に対しハイドライド気相成長法によりエピタキシャル成長されたものであることを特徴とする請求の範囲第1項ないし第7項のいずれか1項に記載の発光素子。
- 前記透明厚膜半導体層は前記発光層部に貼り合わされたIII−V族化合物半導体からなる単結晶基板であることを特徴とする請求の範囲第1項ないし第7項のいずれか1項に記載の発光素子。
- III−V族化合物半導体からなる発光層部と、該発光層部の少なくとも一方の主表面側に形成され、前記発光層部からの発光光束のピーク波長に相当する光量子エネルギーよりも大きなバンドギャップエネルギーを有するIII−V族化合物半導体からなる厚さ10μm以上の透明厚膜半導体層とを有するウェーハを作製し、該ウェーハをダイシングして個々の素子チップに分離するとともに、
前記透明厚膜半導体層中に、ドーパント濃度が5×1016/cm3以上2×1018/cm3以下に制御されたドーピング制御領域を10μm以上の厚さにて形成し、前記ダイシング後において該透明厚膜半導体層の側面部に形成された加工ダメージ層を化学エッチングにより除去することを特徴とする発光素子の製造方法。 - 前記透明厚膜半導体層はGaP、GaAsP及びAlGaAsのいずれかからなり、前記化学エッチングのエッチャントとして硫酸−過酸化水素水溶液が使用されることを特徴とする請求の範囲第10項に記載の発光素子の製造方法。
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