JP2007305998A - 発光素子及びその製造方法 - Google Patents
発光素子及びその製造方法 Download PDFInfo
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- JP2007305998A JP2007305998A JP2007123894A JP2007123894A JP2007305998A JP 2007305998 A JP2007305998 A JP 2007305998A JP 2007123894 A JP2007123894 A JP 2007123894A JP 2007123894 A JP2007123894 A JP 2007123894A JP 2007305998 A JP2007305998 A JP 2007305998A
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- 229910002704 AlGaN Inorganic materials 0.000 description 1
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 1
- -1 Gallium nitride compound Chemical class 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
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- 239000011521 glass Substances 0.000 description 1
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- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
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- H01L2224/48257—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a die pad of the item
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- H01L2224/48465—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
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Abstract
【解決手段】半導体層と、前記半導体層上に位置し、前記半導体層と同一の屈折率または前記半導体層より大きい屈折率の物質で形成される光抽出層と、を含んで発光素子を構成する。
【選択図】図1
Description
20 GaN半導体層
21 p-型GaN半導体層
22 発光層
23 n-型GaN半導体層
24 バッファ層
30 透明電極層
40 光結晶
Claims (58)
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半導体層と、
前記半導体層上に位置し、前記半導体層と同一の屈折率または前記半導体層より大きい屈折率の物質で形成される光抽出層と、
を含んで構成されることを特徴とする発光素子。 - 前記光抽出層には、複数のホールが形成されたことを特徴とする請求項1に記載の発光素子。
- 前記複数のホールには、透明伝導性酸化物が位置することを特徴とする請求項2に記載の発光素子。
- 前記ホールは、規則的に形成されたことを特徴とする請求項2に記載の発光素子。
- 前記光抽出層と前記半導体層との間には、透明伝導性層がさらに含まれることを特徴とする請求項1に記載の発光素子。
- 前記透明伝導性層の厚さは、λ/16n〜λ/2n(nは、透明伝導性層の屈折率)であることを特徴とする請求項5に記載の発光素子。
- 前記光抽出層と前記半導体層との間には、透明金属層がさらに含まれることを特徴とする請求項1に記載の発光素子。
- 前記透明金属層は、Ni及び/またはAu、またはこれらを含む合金で形成されることを特徴とする請求項7に記載の発光素子。
- 前記光抽出層は、酸化物または窒化物で形成されたことを特徴とする請求項1に記載の発光素子。
- 前記光抽出層は、屈折率が2.4以上であることを特徴とする請求項1に記載の発光素子。
- 前記光抽出層は、SiNまたはTiO2で形成されたことを特徴とする請求項1に記載の発光素子。
- 前記半導体層は、
n-型半導体層と、
前記n-型半導体層上に位置する活性層と、
前記活性層上に位置するp-型半導体層と、
を含んで構成されることを特徴とする請求項1に記載の発光素子。 - 前記p-型半導体層の厚さは、30nm〜500nmであることを特徴とする請求項12に記載の発光素子。
- 前記光抽出層は、
前記半導体層上に位置する透明伝導性酸化物層と、
前記透明伝導性酸化物層上に位置し、複数のホールが形成された誘電体層と、
を含んで構成されることを特徴とする請求項1に記載の発光素子。 - 前記光抽出層の厚さは、150nm以上であることを特徴とする請求項1に記載の発光素子。
- 前記半導体層は、
p-型半導体層と、
前記p-型半導体層上に位置する活性層と、
前記活性層上に位置するn-型半導体層と、
を含んで構成されることを特徴とする請求項1に記載の発光素子。 - 前記半導体層は、第1電極上に位置することを特徴とする請求項1に記載の発光素子。
- 前記第1電極は、
反射電極と、
前記反射電極上に位置するオーミック電極と、
を含んで構成されることを特徴とする請求項17に記載の発光素子。 - 前記第1電極は、金属または半導体からなる支持層上に位置することを特徴とする請求項17に記載の発光素子。
- 半導体層と、
前記半導体層上の同一平面上に互いに異なる周期を有する少なくとも二つ以上の光結晶構造からなる光結晶層と、
を含んで構成されることを特徴とする発光素子。 - 前記光結晶層は、多数のホールパターンまたは多数の突出粒子のパターンで形成されることを特徴とする請求項20に記載の発光素子。
- 前記光結晶層のうち最も長い周期を有する光結晶の周期は、800nm〜5000nmであることを特徴とする請求項20に記載の発光素子。
- 前記光結晶層のうち最も長い周期を有する光結晶をなすパターンの深さは、300nm〜3000nmであることを特徴とする請求項20に記載の発光素子。
- 前記光結晶層のうち最も短い周期を有する光結晶の周期は、50nm〜1000nmであることを特徴とする請求項20に記載の発光素子。
- 前記光結晶層のうち最も短い周期を有する光結晶をなすパターンの深さは、50nm〜500nmであることを特徴とする請求項20に記載の発光素子。
- 前記光結晶層の周期をaとしたとき、前記光結晶層の光結晶をなすホールの深さは、0.1a〜0.45aであることを特徴とする請求項20に記載の発光素子。
- 前記半導体層は、
p-型半導体層と、
前記p-型半導体層上に位置する発光層と、
前記発光層上に位置するn-型半導体層と、
を含んで構成されることを特徴とする請求項20に記載の発光素子。 - 前記光結晶層は、n-型半導体層上に形成されたことを特徴とする請求項27に記載の発光素子。
- 前記光結晶層の反対側の前記半導体層表面には、反射型オーミック電極層が位置することを特徴とする請求項20に記載の発光素子。
- 前記反射型オーミック電極層上には、半導体または金属からなる支持層が位置することを特徴とする請求項29に記載の発光素子。
- 前記光結晶層は、
第1周期を有する第1光結晶と、
前記第1周期より長い周期を有する第2光結晶と、
含んで構成されることを特徴とする請求項20に記載の発光素子。 - 前記第1光結晶または第2光結晶は、多数のホールパターンで形成されることを特徴とする請求項31に記載の発光素子。
- 前記第2光結晶層は、前記第1光結晶をなす多数のホールに形成されたことを特徴とする請求項32に記載の発光素子。
- 前記第2光結晶は、多数の突出粒子であることを特徴とする請求項31に記載の発光素子。
- 半導体層と、
前記半導体層上の同一平面上に周期的な第1光結晶と、ランダム構造を有する第2光結晶とからなる光結晶層と、
を含んで構成されることを特徴とする発光素子。 - 前記第2光結晶は、平均周期が前記第1光結晶の周期より小さいことを特徴とする請求項35に記載の発光素子。
- 反射電極と、
前記反射電極上に位置して発光層を含む半導体層と、
前記半導体層上に形成された光結晶と、を含んで構成される発光素子であって、
前記反射電極と発光層の中心間の距離は、0.65〜0.85λ/nであり、
前記λは放出される光の波長、前記nは半導体層の屈折率であることを特徴とする発光素子。 - 前記反射電極は、オーミック電極であることを特徴とする請求項37に記載の発光素子。
- 前記反射電極は、反射率が50%以上であることを特徴とする請求項37に記載の発光素子。
- 前記発光層の厚さは、0.05〜0.25λ/nであることを特徴とする請求項37に記載の発光素子。
- 前記光結晶は、半導体層上に形成されたホールパターンまたは柱構造であることを特徴とする請求項37に記載の発光素子。
- 前記ホールの深さまたは柱構造の高さは、300nm〜3000nmであることを特徴とする請求項41に記載の発光素子。
- 前記ホールまたは柱構造の直径は、前記光結晶の周期をaとしたとき、0.25a〜0.45aであることを特徴とする請求項42に記載の発光素子。
- 前記光結晶の周期は、0.8〜5μmであることを特徴とする請求項37に記載の発光素子。
- 前記反射電極と半導体層との間には、オーミック電極がさらに含まれることを特徴とする請求項37に記載の発光素子。
- 前記オーミック電極は、透明電極であることを特徴とする請求項45に記載の発光素子。
- 前記反射電極と発光層との間には、p-型半導体層が位置することを特徴とする請求項37に記載の発光素子。
- 前記反射電極は、半導体または金属からなる支持層上に位置することを特徴とする請求項37に記載の発光素子。
- 反射電極と、
前記反射電極上に位置して発光層を含む半導体層と、
前記半導体層上に形成された光結晶と、を含んで構成される発光素子であって、
前記反射電極と発光層の中心間の距離は、λ/4nの奇数倍であり、
前記λは放出される光の波長、前記nは半導体層の屈折率であることを特徴とする発光素子。 - 基板上に複数の半導体層を成長させる段階と、
前記半導体層上に第1電極を形成する段階と、
前記基板を除去する段階と、
前記基板が除去された面に露出した半導体層上に誘電体層を形成する段階と、
前記誘電体層に多数のホールを形成する段階と、
前記多数のホールが形成された誘電体層面をエッチングし、前記半導体層に多数の溝を形成する段階と、
前記誘電体層を除去する段階と、
前記誘電体層が除去された半導体層面に第2電極を形成する段階と、
を含んで構成されることを特徴とする発光素子の製造方法。 - 前記複数の半導体層を成長させる段階は、
前記基板上にn-型半導体層を形成する段階と、
前記n-型半導体層上に活性層を形成する段階と、
前記活性層上にp-型半導体層を形成する段階と、
を含むことを特徴とする請求項50に記載の発光素子の製造方法。 - 前記誘電体層は、酸化物または窒化物であることを特徴とする請求項50に記載の発光素子の製造方法。
- 前記溝の深さは、前記基板が除去された面に露出した半導体層の厚さの1/3以上になることを特徴とする請求項50に記載の発光素子の製造方法。
- 前記多数のホールまたは溝は、規則性を有するパターンで形成されることを特徴とする請求項50に記載の発光素子の製造方法。
- 前記多数のホールまたは溝を形成する段階では、乾式エッチング法を用いることを特徴とする請求項50に記載の発光素子の製造方法。
- 前記乾式エッチング法は、RIE(reactive ion etching)またはICP―RIE(inductively coupled plasma reactive ion etching)であることを特徴とする請求項55に記載の発光素子の製造方法。
- 前記乾式エッチングは、Ar、BCl3、Cl2、CF4、CHF3のうち少なくとも何れか一つを用いて行われることを特徴とする請求項55に記載の発光素子の製造方法。
- 前記誘電体層に多数のホールを形成する段階では、前記第2電極の形成領域を除いた部分に多数のホールを形成することを特徴とする請求項50に記載の発光素子の製造方法。
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