JP2009188370A - 発光ダイオード及びその製造方法 - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000004065 semiconductor Substances 0.000 claims abstract description 138
- 238000005530 etching Methods 0.000 claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 150000004767 nitrides Chemical class 0.000 claims description 74
- 238000009832 plasma treatment Methods 0.000 claims description 26
- 238000004381 surface treatment Methods 0.000 claims description 10
- 229920002120 photoresistant polymer Polymers 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 238000001312 dry etching Methods 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 230000005611 electricity Effects 0.000 abstract description 15
- 230000003068 static effect Effects 0.000 abstract description 15
- 229910052594 sapphire Inorganic materials 0.000 description 14
- 239000010980 sapphire Substances 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910002601 GaN Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
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- 230000000694 effects Effects 0.000 description 2
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- 239000007789 gas Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical compound [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- -1 gallium nitride (GaN) series compound Chemical class 0.000 description 1
- HZXMRANICFIONG-UHFFFAOYSA-N gallium phosphide Chemical compound [Ga]#P HZXMRANICFIONG-UHFFFAOYSA-N 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Abstract
【解決手段】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;前記n型半導体層をエッチングする段階と;前記p型半導体層上にp-電極を形成する段階と;エッチングされた前記n型半導体層とp-電極が形成されていない前記p型半導体層の一部にかけてn-電極を形成する段階とを含んで発光ダイオードの製造方法を構成する。
【選択図】図2
Description
前記n-電極は、n型半導体層、エッチング面によって露出された側面活性層、p-電極が形成されていないp型半導体層上に、接触面の電気抵抗が変形されるようにプラズマ処理によって形成される。
前記活性層と並列に接続される電流通路を有する発光ダイオードのn-電極及びp-電極をサブマウントに付着し、フリップチップ形態の発光ダイオードを提供することができる。
前記活性層と並列に接続される電流通路を有する発光ダイオードのn-電極及びp-電極をサブマウントに付着し、フリップチップ形態の発光ダイオードを提供することができる。
図2を参照すると、サファイア基板201上にn型窒化物層203、活性層205、p型窒化物層207、p-電極209から構成された発光ダイオードにおいて、露出されたn型窒化物層とp-電極が形成されていないp型窒化物層上にかけてn-電極211が形成される(p型パッドは図示せず。)。
図3を参照すると、サファイア基板201上にn型窒化物層203、活性層205、p型窒化物層207、p-電極209で構成された発光ダイオード構造が開示されており(p型パッドは図示せず)、エッチングによってn型窒化物層207を露出させるとき、加熱によって円形に再形成されたフォトレジストをエッチングマスクとして用いて乾式エッチングさせることで、図3のように傾斜型メサ構造を有する発光ダイオードを製作できるようになる。
前記p-電極209は、酸化伝導膜またはNi/Auなどの透明金属膜で形成され、n-電極221は、Ti、Al、Pt、Pd、Au、Cr、Fe、Cu、Moを含むグループから選択された何れか一つまたは二つ以上の組み合わせで具現される。
図4を参照すると、発光ダイオード225に直列に接続された抵抗235は、発光ダイオード活性層の接合電位差を含む内部抵抗と半導体-金属間の接触抵抗を全て含む抵抗成分を示したもので、発光ダイオード225と並列に接続された抵抗255は、露出されたn型窒化物層203とp-電極が形成されていないp型窒化物層207上にかけて接触されたn-電極211または221によって形成される電流通路の抵抗に該当する。
Claims (27)
- 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;
前記n型半導体層をエッチングする段階と;
前記p型半導体層上にp-電極を形成する段階と;
エッチングされた前記n型半導体層とp-電極が形成されていない前記p型半導体層の一部にかけてn-電極を形成する段階と;
を含むことを特徴とする発光ダイオードの製造方法。 - 前記エッチング段階は、加熱によって円形に再形成化(thermal reflow)されたフォトレジストをエッチングマスクとして用いて乾式エッチングすることで、エッチング面が傾斜面に形成されることを特徴とする請求項1に記載の発光ダイオードの製造方法。
- 前記n-電極が形成される前に、プラズマ処理を通して半導体層の電気的特性を変化させるプラズマ処理段階をさらに含むことを特徴とする請求項1に記載の発光ダイオードの製造方法。
- 前記n-電極が形成される前に、n-電極が形成されるn型半導体層、活性層を含む傾斜面、p型半導体層の一部に絶縁膜を形成する段階をさらに含むことを特徴とする請求項1に記載の発光ダイオードの製造方法。
- 前記プラズマ処理する段階後に、前記n-電極が形成されるn型半導体層、活性層を含む傾斜面、p型半導体層の一部に絶縁膜を形成する段階をさらに含むことを特徴とする請求項3に記載の発光ダイオードの製造方法。
- 前記n型半導体層、前記活性層及び前記p型半導体層は、窒化物系半導体で構成されることを特徴とする請求項1に記載の発光ダイオードの製造方法。
- 前記プラズマ処理段階のガスは、N、NO、NH、He、Ne、Arからなるグループから選択された何れか一つまたは二つ以上の組み合わせで構成されたことを特徴とする請求項3に記載の発光ダイオードの製造方法。
- 前記プラズマ処理段階中に印加されるプラズマパワーによって、表面処理された半導体層の電気特性が変わることを特徴とする請求項3に記載の発光ダイオードの製造方法。
- 前記プラズマ処理段階中のプラズマ処理時間によって、表面処理された半導体層の電気特性が変わることを特徴とする請求項3に記載の発光ダイオードの製造方法。
- 前記プラズマ処理段階中に印加されるプラズマパワーと処理時間によって、表面処理された半導体層の電気特性が変わることを特徴とする請求項3に記載の発光ダイオードの製造方法。
- 前記n-電極は、Ti、Al、Pt、Pd、Au、Cr、Fe、Cu、Moを含むグループから選択された何れか一つまたは二つ以上の組み合わせであることを特徴とする請求項1に記載の発光ダイオードの製造方法。
- 前記n-電極の形成によって、前記活性層と並列に接続される電流通路を形成することを特徴とする請求項1に記載の発光ダイオードの製造方法。
- 前記n-電極を形成する段階以後に、前記p-電極上に反射板を形成し、前記反射板と前記n-電極をサブマウントに付着してフリップチップ形態で構成することを特徴とする請求項3に記載の発光ダイオードの製造方法。
- 半導体層と接触される前記n-電極の接触面積の大きさを変化させ、前記n-電極と半導体層との接触抵抗を変化させる段階をさらに含むことを特徴とする請求項1に記載の発光ダイオードの製造方法。
- 基板と;
前記基板上に形成されたn型半導体層と;
前記n型半導体層上に形成された活性層と;
前記活性層上に形成されたp型半導体層と;
前記p型半導体層上に形成されたp-電極と;
エッチングで露出された前記n型半導体層と前記p型半導体層の一部にかけて形成されたn-電極と;を含むことを特徴とする発光ダイオード。 - 前記露出されたn型半導体層と前記p型半導体層は、エッチング傾斜面を有し、前記傾斜面に活性層が露出されたことを特徴とする請求項15に記載の発光ダイオード。
- 前記n-電極は、プラズマ処理され、電気的特性が変化された半導体層上に形成されたことを特徴とする請求項15に記載の発光ダイオード。
- 前記n-電極は、n型半導体層、活性層を含む傾斜面、p型半導体層の一部の間に絶縁膜を含むことを特徴とする請求項15に記載の発光ダイオード。
- 前記n型半導体層、前記活性層及び前記p型半導体層は、窒化物系半導体であることを特徴とする請求項15に記載の発光ダイオード。
- 前記プラズマ処理のガスは、N、NO、NH、He、Ne、Arからなるグループから選択された何れか一つまたは二つ以上の組み合わせであることを特徴とする請求項17に記載の発光ダイオード。
- 前記プラズマ処理は、プラズマパワーによって表面処理された半導体層の電気特性が変わることを特徴とする請求項17に記載の発光ダイオード。
- 前記プラズマ処理は、プラズマ処理時間によって表面処理された半導体層の電気特性が変わることを特徴とする請求項17に記載の発光ダイオード。
- 前記プラズマ処理は、プラズマパワーと処理時間によって表面処理された半導体層の電気特性が変わることを特徴とする請求項17に記載の発光ダイオード。
- 前記n-電極は、Ti、Al、Pt、Pd、Au、Cr、Fe、Cu、Moを含むグループから選択された何れか一つまたは二つ以上の組み合わせで構成されることを特徴とする請求項15に記載の発光ダイオード。
- 前記n-電極の形成によって、前記活性層と並列に接続される電流通路が形成されることを特徴とする請求項15に記載の発光ダイオード。
- 前記p-電極上に反射板をさらに含み、前記反射板と前記n-電極をサブマウントに付着することを特徴とする請求項17に記載の発光ダイオード。
- 半導体層と接触される前記n-電極の接触面積の大きさによって、前記n-電極と半導体層との接触抵抗が決定されることを特徴とする請求項15に記載の発光ダイオード。
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US8441018B2 (en) | 2007-08-16 | 2013-05-14 | The Trustees Of Columbia University In The City Of New York | Direct bandgap substrates and methods of making and using |
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KR101654340B1 (ko) * | 2009-12-28 | 2016-09-06 | 서울바이오시스 주식회사 | 발광 다이오드 |
JP5281612B2 (ja) * | 2010-05-26 | 2013-09-04 | 株式会社東芝 | 半導体発光装置及びその製造方法 |
KR101139915B1 (ko) * | 2010-06-08 | 2012-04-30 | 부경대학교 산학협력단 | 내정전성 발광소자 및 그 제조방법 |
TWI515923B (zh) * | 2011-08-30 | 2016-01-01 | 晶元光電股份有限公司 | 發光元件 |
TWI578565B (zh) * | 2013-09-17 | 2017-04-11 | 隆達電子股份有限公司 | 發光二極體 |
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JP5575378B2 (ja) | 2014-08-20 |
KR20090084540A (ko) | 2009-08-05 |
TWI381552B (zh) | 2013-01-01 |
US20090194779A1 (en) | 2009-08-06 |
TW200935626A (en) | 2009-08-16 |
KR101457204B1 (ko) | 2014-11-03 |
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