JP4511473B2 - Iii族窒化物基反射器を製造する方法 - Google Patents
Iii族窒化物基反射器を製造する方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 28
- 150000004767 nitrides Chemical class 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 20
- 239000000758 substrate Substances 0.000 claims description 21
- 229910052594 sapphire Inorganic materials 0.000 claims description 11
- 239000010980 sapphire Substances 0.000 claims description 11
- 238000001451 molecular beam epitaxy Methods 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 7
- 238000003955 hot wall epitaxy Methods 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 239000012159 carrier gas Substances 0.000 claims description 6
- 238000002248 hydride vapour-phase epitaxy Methods 0.000 claims description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 3
- 238000000407 epitaxy Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 claims 1
- 238000002310 reflectometry Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 8
- 229910002704 AlGaN Inorganic materials 0.000 description 5
- 238000000927 vapour-phase epitaxy Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 238000000879 optical micrograph Methods 0.000 description 3
- 238000000985 reflectance spectrum Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000003917 TEM image Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000000089 atomic force micrograph Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 239000013308 plastic optical fiber Substances 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
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- H01S5/00—Semiconductor lasers
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- H01S5/32—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures
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- H01S5/32341—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser emitting light at a wavelength less than 900 nm blue laser based on GaN or GaP
Description
(1)基板上に成長するバッファ層と、
(2)バッファ層上に成長する厚いGaN層と、
(3)厚いGaN層上に成長する一対以上の1/4波長GaNとAlN反射器膜と、
(4)一対以上のAlN/GaN層から形成される超格子(1/4波長)、および1/4波長GaN層からなるひずみ解放層と、
(5)前記ひずみ解放層上に形成された一対以上の1/4波長GaNとAlN反射器膜と、
を備えるIII族窒化物基分布ブラッグ反射器の製造方法。
このように、クラックのない分布ブラッグ反射器が本発明により達成される。
本方法を示す図1を参照すると、AlN/GaN超格子を挿入する分布ブラッグ反射器を、有機金属化学気相エピタキシー法により成長させる。
最初に、エピ対応のサファイヤ基板をMOCVD反応室内に置く。基板表面の不純物を5分間高温(1100℃)水素雰囲気において除去し、その後成長温度を500℃に下げて厚さ30nmのバッファ層を成長させた。次に、成長圧力が200Torrで回転速度が900rpmにおいて、厚さ3μmのGaN層をバッファ層の上に成長させた。
AlN/GaN超格子を挿入しない実際の別のサンプルを同じ成長パラメータで成長させた。その結果、図2(a)に示すような20対のAlN/GaN超格子が挿入されないDBRサンプルの表面においてクラックが観測された。その反射率スペクトルを図5中の点線で示す。
Claims (12)
- (1)基板上にバッファ層を成長させる工程、
(2)前記バッファ層上にGaN層を成長させる工程、
(3)前記GaN層上に一対以上のGaNとAlN反射器膜を成長させる工程、
(4)前記反射器膜上にGaNおよびAlNの1対以上の層から構成される超格子とGaN層とからなるひずみ解放層を成長させる工程、
(5)前記(4)工程のGaN層上に一対以上のGaNとAlN反射器膜を成長させる工程、
を備え、前記(4)および(5)の工程は1回以上行うことを特徴とするIII族窒化物基分布ブラッグ反射器を製造する方法。 - 前記基板は、サファイヤ、炭化珪素(SiC)、酸化亜鉛(ZnO)、シリコン基板から選択される少なくとも1つ、またはそれらの組み合わせからなることを特徴とする請求項1に記載のIII族窒化物基分布ブラッグ反射器を製造する方法。
- 前記バッファ層は100〜1000℃の温度で成長することを特徴とする請求項1に記載のIII族窒化物基分布ブラッグ反射器を製造する方法。
- 前記バッファ層上のGaN層は、基板をMOCVD反応室に置き、圧力が50〜500Torrおよび回転速度が900rpmで成長することを特徴とする請求項1に記載のIII族窒化物基分布ブラッグ反射器を製造する方法。
- 前記反射器膜は、キャリヤーガスである窒素(N2)の流量が10〜6000sccm、水素(H2)の流量が0〜200sccm、圧力が1〜300Torr、および温度が300〜1500℃において成長することを特徴とする請求項1に記載のIII族窒化物基分布ブラッグ反射器を製造する方法。
- 前記反射器膜は、NH3 の流量が100〜1500sccm、TMGaの流量が1〜20sccm、およびTMAlの流量が10〜200sccmの条件で成長することを特徴とする請求項1に記載のIII族窒化物基分布ブラッグ反射器を製造する方法。
- 前記反射器膜のGaN層は、有機金属化学気相エピタキシー法、水素化物気相エピタキシー法、分子線エピタキシー法、またはホットウォールエピタキシー法により成長することを特徴とする請求項1に記載のIII族窒化物基分布ブラッグ反射器を製造する方法。
- 前記バッファ層の厚さは、1〜100nmの範囲内にあることを特徴とする請求項1に記載のIII族窒化物基分布ブラッグ反射器を製造する方法。
- 前記バッファ層のGaN層の厚さは、10〜100nmの範囲内であることを特徴とする請求項1に記載のIII族窒化物基分布ブラッグ反射器を製造する方法。
- 前記反射器膜の各層の光学的厚さは1/4(1±20%)波長であり、AlN/GaN層対の合計光学的厚さは1/2波長であることを特徴とする請求項1に記載のIII族窒化物基分布ブラッグ反射器を製造する方法。
- バッファ層、GaN層、一対以上のGaN/AlNにより構成される反射器膜、GaN/AlNの一対以上の層から構成される超格子とGaN層とからなるひずみ解放層、および前記ひずみ解放層上に形成された一対以上のGaN/AlNにより構成される反射器膜を備え、前記ひずみ解放層および前記ひずみ解放層上に形成された反射器膜からなる組は1組以上存在し、前記順に基板上に成長させ、前記超格子の光学的厚さは1/4波長である請求項1〜10のいずれかに記載の方法により製造されることを特徴とする分布ブラッグ反射器。
- 前記超格子の両側は薄いAlN層であることを特徴とする請求項11に記載の分布ブラッグ反射器。
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TW094142756A TW200723624A (en) | 2005-12-05 | 2005-12-05 | Process of producing group III nitride based reflectors |
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US7928471B2 (en) * | 2006-12-04 | 2011-04-19 | The United States Of America As Represented By The Secretary Of The Navy | Group III-nitride growth on silicon or silicon germanium substrates and method and devices therefor |
US7795642B2 (en) * | 2007-09-14 | 2010-09-14 | Transphorm, Inc. | III-nitride devices with recessed gates |
US20090072269A1 (en) * | 2007-09-17 | 2009-03-19 | Chang Soo Suh | Gallium nitride diodes and integrated components |
US7915643B2 (en) | 2007-09-17 | 2011-03-29 | Transphorm Inc. | Enhancement mode gallium nitride power devices |
US8519438B2 (en) * | 2008-04-23 | 2013-08-27 | Transphorm Inc. | Enhancement mode III-N HEMTs |
US8289065B2 (en) | 2008-09-23 | 2012-10-16 | Transphorm Inc. | Inductive load power switching circuits |
US7898004B2 (en) | 2008-12-10 | 2011-03-01 | Transphorm Inc. | Semiconductor heterostructure diodes |
US8742459B2 (en) | 2009-05-14 | 2014-06-03 | Transphorm Inc. | High voltage III-nitride semiconductor devices |
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