JP5732140B2 - 窒化物半導体素子及びその製造方法 - Google Patents
窒化物半導体素子及びその製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 99
- 150000004767 nitrides Chemical class 0.000 title claims description 63
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000010410 layer Substances 0.000 claims description 307
- 229910002704 AlGaN Inorganic materials 0.000 claims description 68
- 238000000034 method Methods 0.000 claims description 46
- 238000000137 annealing Methods 0.000 claims description 35
- 238000009792 diffusion process Methods 0.000 claims description 28
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 22
- 230000002265 prevention Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 11
- 238000000151 deposition Methods 0.000 claims description 10
- 239000012790 adhesive layer Substances 0.000 claims description 9
- 238000000059 patterning Methods 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 description 29
- 238000005253 cladding Methods 0.000 description 20
- 238000005275 alloying Methods 0.000 description 18
- 239000000523 sample Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 238000002474 experimental method Methods 0.000 description 9
- 239000000758 substrate Substances 0.000 description 9
- 239000012298 atmosphere Substances 0.000 description 8
- 229910052594 sapphire Inorganic materials 0.000 description 8
- 239000010980 sapphire Substances 0.000 description 8
- 229920002120 photoresistant polymer Polymers 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000005530 etching Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000013074 reference sample Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005566 electron beam evaporation Methods 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000001451 molecular beam epitaxy Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000001947 vapour-phase growth Methods 0.000 description 1
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- Electrodes Of Semiconductors (AREA)
Description
2: サファイア基板
3: AlN層
4: AlGaN層
5: テンプレート(下地構造部)
6: n型クラッド層(n型AlGaN)
7: 活性層
7a: バリア層
7b: 井戸層
8: 電子ブロック層(p型AlGaN)
9: p型クラッド層(p型AlGaN)
10: pコンタクト層(p型GaN)
11: 発光素子構造部(素子構造部)
12: p電極
13: n電極
13a: n電極コンタクト部
13b: n電極パッド部
14: Au層
15: Au拡散防止層(ITO層)
16: Ni層
17: Ni層(接着層)
R1: 第1領域
R2: 第2領域
Claims (10)
- 下地構造部と、
前記下地構造部上に形成された、少なくともn型AlGaN系半導体層とp型AlGaN系半導体層を有する素子構造部と、
前記n型AlGaN系半導体層上に形成されたn電極と、
前記p型AlGaN系半導体層上に形成されたp電極と、を備えてなり、
前記n型AlGaN系半導体層のAlNモル分率が20%以上であり、
前記n電極が、n電極コンタクト部と、前記n電極コンタクト部上に形成されたn電極パッド部とからなり、
前記n電極コンタクト部が、1層以上の金属層で構成され、
前記p電極の積層構造と前記n電極パッド部の積層構造が、全く同じ積層構造であり、最上層にAu層を有し、前記最上層より下側に導電性の金属酸化物からなるAuの拡散を防止するAu拡散防止層を有する2層以上の共通積層構造であることを特徴とする窒化物半導体素子。 - 前記n電極コンタクト部が、Alを含むことを特徴とする請求項1に記載の窒化物半導体素子。
- 前記Au拡散防止層が、ITO層であることを特徴とする請求項1または2に記載の窒化物半導体素子。
- 前記n電極コンタクト部が、Auを含まないことを特徴とする請求項1〜3の何れか1項に記載の窒化物半導体素子。
- 前記共通積層構造の最上層である前記Au層と前記Au拡散防止層の間に、前記Au層と前記Au拡散防止層を接着させるための導電性接着層が設けられ、
前記導電性接着層の膜厚が前記Au層の膜厚の2分の1以下であることを特徴とする請求項1〜4の何れか1項に記載の窒化物半導体素子。 - 前記素子構造部が、前記n型AlGaN系半導体層と前記p型AlGaN系半導体層の間に、AlGaN系半導体層を有する活性層を備えた発光素子構造部であることを特徴とする請求項1〜5の何れか1項に記載の窒化物半導体素子。
- 請求項1〜6の何れか1項に記載の窒化物半導体素子の製造方法であって、
前記下地構造部を形成する工程と、
前記素子構造部を形成する工程と、
前記n電極コンタクト部を構成する金属層を堆積及びパターニングして、前記n型AlGaN系半導体層上に前記n電極コンタクト部を形成した後に、第1のアニール処理を施す工程と、
前記共通積層構造を構成する多層膜を堆積及びパターニングして、前記n電極コンタクト部上に前記n電極パッド部を、前記p型AlGaN系半導体層上に前記p電極を同時に形成した後に、第2のアニール処理を施す工程と、有することを特徴とする窒化物半導体素子の製造方法。 - 前記第2のアニール処理の処理温度が前記第1のアニール処理の処理温度より低温であることを特徴とする請求項7に記載の窒化物半導体素子の製造方法。
- 前記第1のアニール処理の処理温度が700℃以上1000℃以下であることを特徴とする請求項7または8に記載の窒化物半導体素子の製造方法。
- 前記第2のアニール処理の処理温度が400℃以上600℃以下であることを特徴とする請求項7〜9の何れか1項に記載の窒化物半導体素子の製造方法。
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PCT/JP2011/072524 WO2013046419A1 (ja) | 2011-09-30 | 2011-09-30 | 窒化物半導体素子及びその製造方法 |
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US (1) | US9281439B2 (ja) |
EP (1) | EP2763192B1 (ja) |
JP (1) | JP5732140B2 (ja) |
KR (1) | KR101568624B1 (ja) |
RU (1) | RU2566383C1 (ja) |
TW (1) | TWI501425B (ja) |
WO (1) | WO2013046419A1 (ja) |
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JP7060508B2 (ja) | 2016-08-26 | 2022-04-26 | スタンレー電気株式会社 | Iii族窒化物半導体発光素子および該素子構成を含むウエハ |
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