JP5117596B2 - 半導体発光素子、ウェーハ、および窒化物半導体結晶層の製造方法 - Google Patents
半導体発光素子、ウェーハ、および窒化物半導体結晶層の製造方法 Download PDFInfo
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Description
図1は、実施の形態にかかる半導体発光素子を表す断面模式図である。
本実施形態にかかる半導体発光素子110は、n形層(第1半導体層)10と、p形層(第2半導体層)20と、MQW(Multiple Quantum Well)活性層(発光層)30と、支持基板40と、突起部(低屈折率層)60と、反射金属80と、を備える。そして、本実施形態にかかる半導体発光素子110では、p形層20、MQW活性層30、n形層10のLED(Light Emitting Diode)積層構造に対して、p形層20側に反射金属80を介してSi基板からなる支持基板40が接合されている。反射金属80は、電極膜を兼用する。
また、図3は、さらに他の実施の形態にかかる半導体発光素子を表す断面模式図である。
また、図4は、さらに他の実施の形態にかかる半導体発光素子を表す断面模式図である。
また、図5は、図2に表した半導体発光素子に透明導電体膜が設けられた状態を表す断面模式図である。
また、図6は、図4に表した半導体発光素子に透明導電体膜が設けられた状態を表す断面模式図である。
なお、図2〜図6に表した半導体発光素子では、図1に表した支持基板40を省略している。
一方、図5および図6に表したように、凹凸面(突起部60を含む光取り出し面10b)上に酸化インジウム錫(ITO)に代表される透明導電体膜75を積層しn側電極とする場合には、図2に表した半導体発光素子120あるいは図4に表した半導体発光素子140のほうが有利である。一般に積層するITO層(透明導電体膜)75の厚さが200nm程度であり、表面の凹凸が小さいほうがITO膜厚に対して同等かそれ以下であるほうが、透明導電体膜75の段切れなどの問題が生じにくいためである。
図7(a)〜図7(c)は、実施の形態に係るウェーハおよび窒化物半導体結晶層の製造方法を例示する断面模式図である。
図8(a)〜図8(f)は、実施の形態に係るウェーハおよび窒化物半導体結晶層の他の製造方法を例示する断面模式図である。
図9(a)および図9(b)は、さらに他の実施の形態にかかる半導体発光素子を説明する断面模式図である。
図10(b)に表したように、本実施形態にかかる半導体発光素子160では、エッチング前のAlNの突起部60の大きさ(横方向の幅)及び間隔を不規則に配置している。これにより、ドライエッチング後の凹凸の形状により不規則性をもたらすことが可能である。
また、各具体例のいずれか2つ以上の要素を技術的に可能な範囲で組み合わせたものも、本発明の要旨を包含する限り本発明の範囲に含まれる。
Claims (6)
- 光取り出し面を形成し窒化物半導体結晶を含む第1半導体層と、
前記第1半導体層の上に設けられ活性層を有する発光層と、
前記発光層の上に設けられた第2半導体層と、
前記第1半導体層の屈折率よりも低い屈折率を有し、前記光取り出し面を部分的に覆って凹凸形状の凸部となり、窒化物半導体結晶を含む低屈折率層と、
を備え、
前記第1半導体層が前記低屈折率層を基点に前記低屈折率層の上に一体の膜となるようにエピタキシャル成長して前記低屈折率層の格子と前記第1半導体層の格子とが連続したことを特徴とする半導体発光素子。 - 前記光取り出し面は、凹凸形状を有し、
前記低屈折率層は、前記光取り出し面の前記凹凸形状の上に設けられたことを特徴とする請求項1記載の半導体発光素子。 - 前記低屈折率層は、Alを含み、
前記第1半導体層のAlの含有量は、前記低屈折率層のAlの含有量よりも少ないことを特徴とする請求項2記載の半導体発光素子。 - 基板と、
凹凸形状を有する光取り出し面を形成し窒化物半導体結晶を含む半導体層と、
前記半導体層の屈折率よりも低い屈折率を有し、前記凹凸形状の上に設けられ前記光取り出し面を部分的に覆って凹凸形状の凸部となり、窒化物半導体結晶を含む低屈折率層と、
を備え、
前記半導体層が前記低屈折率層を基点に前記低屈折率層の上に一体の膜となるようにエピタキシャル成長して前記低屈折率層の格子と前記半導体層の格子とが連続したことを特徴とするウェーハ。 - 結晶基板の上に、前記結晶基板の主面を部分的に覆うようにAlを含む窒化物半導体結晶を含む第1結晶層を形成し、
前記第1結晶層の上に前記第1結晶層よりもAlの含有量が少ない窒化物半導体結晶を含む第2結晶層であって、前記第1結晶層の格子と連続した格子を有する第2結晶層を前記第1結晶層に覆われていない前記結晶基板の表面には形成しないまま前記第1結晶層を基点に前記第1結晶層の上に一体の膜となるようにエピタキシャル成長させた後、
前記結晶基板を剥離し、前記結晶基板の主面に対向する前記第2結晶層の主面に前記第1結晶層が凸部となる凹凸形状を形成することを特徴とする窒化物半導体結晶層の製造方法。 - 前記第2結晶層の屈折率は、前記第1結晶層の屈折率よりも高いことを特徴とする請求項5記載の窒化物半導体結晶層の製造方法。
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| US13/220,059 US8952401B2 (en) | 2011-05-16 | 2011-08-29 | Semiconductor light emitting device, wafer, and method for manufacturing nitride semiconductor crystal layer |
| US14/577,523 US20150102381A1 (en) | 2011-05-16 | 2014-12-19 | Semiconductor light emitting device, wafer, and method for manufacturing nitride semiconductor crystal layer |
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| JP2015050256A (ja) * | 2013-08-30 | 2015-03-16 | 株式会社東芝 | 窒化物半導体発光装置 |
| US10381517B2 (en) * | 2014-01-29 | 2019-08-13 | Auk Corp. | Aluminum-gallium-indium-phosphorus-based light emitting diode having gallium nitride layer of uneven type and method for manufacturing same |
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| JP2016058693A (ja) * | 2014-09-12 | 2016-04-21 | 株式会社東芝 | 半導体装置、半導体ウェーハ、及び、半導体装置の製造方法 |
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| JP2010114337A (ja) * | 2008-11-10 | 2010-05-20 | Hitachi Cable Ltd | 発光素子 |
| JP2010278237A (ja) | 2009-05-28 | 2010-12-09 | Kyocera Corp | 発光素子 |
| WO2011024943A1 (ja) * | 2009-08-31 | 2011-03-03 | 京セラ株式会社 | 発光素子 |
| JP2011060917A (ja) * | 2009-09-08 | 2011-03-24 | Rohm Co Ltd | 半導体発光素子 |
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2011
- 2011-05-16 JP JP2011109784A patent/JP5117596B2/ja not_active Expired - Fee Related
- 2011-08-29 US US13/220,059 patent/US8952401B2/en active Active
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| Publication number | Publication date |
|---|---|
| US20120292649A1 (en) | 2012-11-22 |
| US20150102381A1 (en) | 2015-04-16 |
| US8952401B2 (en) | 2015-02-10 |
| JP2012243815A (ja) | 2012-12-10 |
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