JP7642553B2 - 半導体発光素子、及び半導体発光素子の製造方法 - Google Patents
半導体発光素子、及び半導体発光素子の製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 107
- 238000000034 method Methods 0.000 title claims description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 25
- 238000005253 cladding Methods 0.000 claims description 212
- 230000004888 barrier function Effects 0.000 claims description 171
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 128
- 229910052799 carbon Inorganic materials 0.000 claims description 128
- 150000004767 nitrides Chemical class 0.000 claims description 22
- 239000000758 substrate Substances 0.000 claims description 19
- 239000002019 doping agent Substances 0.000 claims description 13
- 230000007423 decrease Effects 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 229910002704 AlGaN Inorganic materials 0.000 claims 2
- 230000031700 light absorption Effects 0.000 description 21
- 230000000903 blocking effect Effects 0.000 description 15
- 239000012535 impurity Substances 0.000 description 15
- 239000013078 crystal Substances 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 9
- 238000009826 distribution Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 8
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 8
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000001771 vacuum deposition Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- QBJCZLXULXFYCK-UHFFFAOYSA-N magnesium;cyclopenta-1,3-diene Chemical compound [Mg+2].C1C=CC=[C-]1.C1C=CC=[C-]1 QBJCZLXULXFYCK-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Description
実施の形態に係る半導体発光素子について説明する。
まず、本実施の形態に係る半導体発光素子の全体構成について図1及び図2を用いて説明する。図1は、本実施の形態に係る半導体発光素子10の全体構成を示す模式的な断面図である。図2は、本実施の形態に係る半導体発光素子10が備える各層の構成を示す図である。図2には、半導体発光素子10の各層の材質、In組成比又はAl組成比、膜厚、並びに、不純物(つまり、ドーパント)及びその濃度が示されている。
次に、本実施の形態に係る電子障壁層18及びp型クラッド層19の詳細構成について、図3を用いて説明する。図3は、本実施の形態に係る電子障壁層18の一部(一定組成領域)及びp型クラッド層19の積層方向の位置に対するMg及び炭素の濃度、並びに、Al組成比の分布を示すグラフである。図3には、上段から順に、Mg濃度、炭素濃度、及びAl組成比の分布が示されている。ここで、積層方向とは、各半導体層が積層される厚さ方向、つまり、基板11の主面に垂直な方向を意味する。
次に、本実施の形態に係る半導体発光素子10の製造方法について説明する。まず、本実施の形態に係る半導体発光素子10全体の製造方法の概要を説明する。
以上、本開示に係る半導体発光素子などについて、各実施の形態に基づいて説明したが、本開示は、上記実施の形態に限定されるものではない。
11 基板
13 n型クラッド層
14 n側ガイド層
15 発光層
16 p側ガイド層
17 中間層
18 電子障壁層
19 p型クラッド層
19r リッジ部
20 コンタクト層
21 電流ブロック層
22 p側電極
23 パッド電極
24 n側電極
25 密着補助層
R1 低濃度比領域
R2 高濃度比領域
Claims (16)
- III族窒化物半導体からなる発光層と、
前記発光層の上方に配置され、Alを含むIII族窒化物半導体からなる電子障壁層と、
前記電子障壁層の上方において、前記電子障壁層と接して配置されるクラッド層とを備え、
前記電子障壁層及び前記クラッド層は、ドーパントとしてMgを含み、
前記クラッド層は、前記電子障壁層側から順に、炭素を含む高炭素濃度領域と、前記高炭素濃度領域より炭素濃度が低い低炭素濃度領域とを含み、
前記クラッド層は、AlGaN層である
半導体発光素子。 - III族窒化物半導体からなる発光層と、
前記発光層の上方に配置され、Alを含むIII族窒化物半導体からなる電子障壁層と、
前記電子障壁層の上方において、前記電子障壁層と接して配置されるクラッド層と、
前記クラッド層の上方に配置されるコンタクト層とを備え、
前記電子障壁層及び前記クラッド層は、ドーパントとしてMgを含み、
前記クラッド層は、前記電子障壁層側から順に、炭素を含む高炭素濃度領域と、前記高炭素濃度領域より炭素濃度が低い低炭素濃度領域とを含む
半導体発光素子。 - III族窒化物半導体からなる発光層と、
前記発光層の上方に配置され、Alを含むIII族窒化物半導体からなる電子障壁層と、
前記電子障壁層の上方において、前記電子障壁層と接して配置されるクラッド層とを備え、
前記電子障壁層及び前記クラッド層は、ドーパントとしてMgを含み、
前記クラッド層は、前記電子障壁層側から順に、炭素を含む高炭素濃度領域と、前記高炭素濃度領域より炭素濃度が低い低炭素濃度領域とを含み、
前記クラッド層は、炭素のMgに対する濃度比が1%以下となる領域を含む
半導体発光素子。 - III族窒化物半導体からなる発光層と、
前記発光層の上方に配置され、Alを含むIII族窒化物半導体からなる電子障壁層と、
前記電子障壁層の上方において、前記電子障壁層と接して配置されるクラッド層とを備え、
前記電子障壁層及び前記クラッド層は、ドーパントとしてMgを含み、
前記クラッド層は、前記電子障壁層側から順に、炭素を含む高炭素濃度領域と、前記高炭素濃度領域より炭素濃度が低い低炭素濃度領域とを含み、
前記電子障壁層は、炭素のMgに対する濃度比が1×10 -3 以下となる領域を含む
半導体発光素子。 - 前記クラッド層の上方に配置されるコンタクト層をさらに備える
請求項1、3、4のいずれか1項に記載の半導体発光素子。 - 前記クラッド層は、前記発光層よりバンドギャップエネルギーが高い
請求項1~5のいずれか1項に記載の半導体発光素子。 - 前記高炭素濃度領域は、Mg濃度が前記電子障壁層から遠ざかるにしたがって減少する減少領域を含む
請求項1~6のいずれか1項に記載の半導体発光素子。 - 前記減少領域は、前記クラッド層と前記電子障壁層との界面から50nm以上離れた領域であって、積層方向における位置に対するMg濃度の変化率が0.5×1017cm-3/nm以上の領域を含む
請求項7に記載の半導体発光素子。 - 前記クラッド層は、炭素のMgに対する濃度比が小さい低濃度比領域と、前記低濃度比領域の上方に配置され、前記低濃度比領域より炭素のMgに対する濃度比が大きい高濃度
比領域とを含む
請求項1~8のいずれか1項に記載の半導体発光素子。 - 前記クラッド層は、Mgを含む低Mg濃度領域と、前記低Mg濃度領域の上方に配置され、前記低Mg濃度領域よりMg濃度が高い高Mg濃度領域とを含む
請求項1~9のいずれか1項に記載の半導体発光素子。 - 前記電子障壁層におけるMg濃度は、1×1017cm-3以上、かつ1×1020cm-3以下である
請求項1~10のいずれか1項に記載の半導体発光素子。 - 前記クラッド層は、III族窒化物半導体基板の主面の上方に配置される
請求項1~11のいずれか1項に記載の半導体発光素子。 - 半導体発光素子の製造方法であって、
III族窒化物半導体からなる発光層を形成する工程と、
前記発光層の上方に、Alを含むIII族窒化物半導体からなる電子障壁層を形成する工
程と、
前記電子障壁層の上方に、前記電子障壁層と接するクラッド層を形成する工程とを含み、
前記電子障壁層を形成する工程において、ドーパントとしてMgを供給し、
前記クラッド層を形成する工程において、成長レートを変化させ、
前記クラッド層は、AlGaN層である
半導体発光素子の製造方法。 - 半導体発光素子の製造方法であって、
III族窒化物半導体からなる発光層を形成する工程と、
前記発光層の上方に、Alを含むIII族窒化物半導体からなる電子障壁層を形成する工
程と、
前記電子障壁層の上方に、前記電子障壁層と接するクラッド層を形成する工程と、
前記クラッド層の上方に、コンタクト層を形成する工程とを含み、
前記電子障壁層を形成する工程において、ドーパントとしてMgを供給し、
前記クラッド層を形成する工程において、成長レートを変化させる
半導体発光素子の製造方法。 - 前記クラッド層を形成する工程において、Ga供給量を変化させることで前記成長レートを変化させる
請求項13又は14に記載の半導体発光素子の製造方法。 - 前記クラッド層を形成する工程におけるGa供給量は、前記クラッド層を形成する工程の開始直後の方が、前記クラッド層を形成する工程の終了直前より、多い
請求項13~15のいずれか1項に記載の半導体発光素子の製造方法。
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