JPWO2011118433A1 - 半導体素子用エピタキシャル基板および半導体素子 - Google Patents
半導体素子用エピタキシャル基板および半導体素子 Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims abstract description 123
- 239000004065 semiconductor Substances 0.000 title claims abstract description 39
- 230000004888 barrier function Effects 0.000 claims abstract description 112
- 239000000203 mixture Substances 0.000 claims abstract description 83
- 150000004767 nitrides Chemical class 0.000 claims abstract description 47
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 229910052738 indium Inorganic materials 0.000 claims abstract description 5
- 125000006850 spacer group Chemical group 0.000 claims description 36
- 238000010587 phase diagram Methods 0.000 claims description 11
- 239000010410 layer Substances 0.000 description 232
- 230000005533 two-dimensional electron gas Effects 0.000 description 21
- 229910002601 GaN Inorganic materials 0.000 description 18
- 230000015572 biosynthetic process Effects 0.000 description 18
- 239000007789 gas Substances 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 229910052751 metal Inorganic materials 0.000 description 13
- 239000002184 metal Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 229910001873 dinitrogen Inorganic materials 0.000 description 6
- 230000010287 polarization Effects 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910002704 AlGaN Inorganic materials 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 230000005587 bubbling Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 125000004430 oxygen atom Chemical group O* 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
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- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000000089 atomic force micrograph Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 125000002524 organometallic group Chemical group 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000002248 hydride vapour-phase epitaxy Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000011165 process development Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000001947 vapour-phase growth Methods 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
Description
<エピタキシャル基板の構成>
図1は、本発明の第1の実施の形態に係るエピタキシャル基板10Aと、これを用いて作製されたHEMT素子10の構成を概略的に示す断面模式図である。エピタキシャル基板10Aは、基板1と、バッファ層2と、チャネル層3と、障壁層5とが積層形成された構成を有する。バッファ層2と、チャネル層3と、障壁層5とはいずれも、MOCVD法(有機金属化学的気相成長法)を用いてエピタキシャル形成される(詳細は後述)のが好適な一例である。なお、図1における各層の厚みの比率は、実際のものを反映したものではない。
次に、本実施の形態において特徴的である、障壁層5の構成態様について説明する。具体的には、障壁層5は、その取り得る組成範囲および表面形態に特徴を有する。
図4:Al0.1Ga0.9N(x1=0、y1=0.1、z1=0.9);
図5:Al0.2Ga0.8N(x1=0、y1=0.2、z1=0.8);
図6:Al0.3Ga0.7N(x1=0、y1=0.3、z1=0.7)。
次に、チャネル層3および障壁層5が上述のような組成範囲を有するエピタキシャル基板10Aを作製する方法を説明する。
<スペーサ層を備えるHEMT素子>
図7は、本発明の第2の実施の形態に係るエピタキシャル基板20Aと、これを用いて作製されたHEMT素子20の構成を概略的に示す断面模式図である。エピタキシャル基板20Aは、第1の実施の形態に係るエピタキシャル基板10Aのチャネル層3と障壁層5の間に、スペーサ層4が介挿された構成を有する。スペーサ層4以外の構成要素については、第1の実施の形態に係るエピタキシャル基板10Aと同じであるので、その詳細な説明は省略する。
上述のような構造を有するエピタキシャル基板20Aは、スペーサ層4の形成に係るプロセスを除き、第1の実施の形態に係るエピタキシャル基板10Aと同様の方法で作製される。
Claims (6)
- 下地基板と、
少なくともGaを含む、Inx1Aly1Gaz1N(x1+y1+z1=1)なる組成の第1のIII族窒化物からなるチャネル層と、
少なくともInとAlを含む、Inx2Aly2Gaz2N(x2+y2+z2=1)なる組成の第2のIII族窒化物からなる障壁層と、
を備える半導体素子用のエピタキシャル基板であって、
前記障壁層が面内方向に引張歪みを内在してなり、かつ、前記障壁層の表面に、5×107/cm2以上1×109/cm2以下の面密度でピットが形成されてなる、
ことを特徴とする半導体素子用エピタキシャル基板。 - 請求項1に記載の半導体素子用エピタキシャル基板であって、
前記第1のIII族窒化物の組成がx1=0、0≦y1≦0.3で定まる範囲内にあるとともに、
前記第2のIII族窒化物の組成が、InN、AlN、GaNを頂点とする三元状態図上において、前記第1のIII族窒化物の組成に応じて定まる以下の各式で表される直線にて囲まれる第1の組成範囲内にある、
ことを特徴とする半導体素子用エピタキシャル基板。
- 請求項2に記載の半導体素子用エピタキシャル基板であって、
前記第2のIII族窒化物の組成が、前記第1の組成範囲であって、さらに以下の各式で表される直線にて囲まれる範囲内にある、
ことを特徴とする半導体素子用エピタキシャル基板。
- 請求項1ないし請求項3のいずれかに記載の半導体素子用エピタキシャル基板であって、
前記チャネル層と前記障壁層との間に、AlNからなるスペーサ層、
をさらに備えることを特徴とする半導体素子用エピタキシャル基板。 - 請求項1ないし請求項4のいずれかに記載の半導体素子用エピタキシャル基板であって、
前記第1のIII族窒化物がGaNである、
ことを特徴とする半導体素子用エピタキシャル基板。 - 請求項1ないし請求項5のいずれかに記載の半導体素子用エピタキシャル基板を用いて作製された半導体素子。
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PCT/JP2011/055921 WO2011118433A1 (ja) | 2010-03-24 | 2011-03-14 | 半導体素子用エピタキシャル基板および半導体素子 |
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US20120313213A1 (en) * | 2011-06-07 | 2012-12-13 | Raytheon Company | Polygon shaped power amplifier chips |
WO2013011617A1 (ja) * | 2011-07-15 | 2013-01-24 | パナソニック株式会社 | 半導体装置及びその製造方法 |
CN104126223A (zh) * | 2012-02-23 | 2014-10-29 | 日本碍子株式会社 | 半导体元件及半导体元件的制造方法 |
KR101933230B1 (ko) * | 2012-08-10 | 2018-12-27 | 엔지케이 인슐레이터 엘티디 | 반도체 소자, hemt 소자, 및 반도체 소자의 제조 방법 |
JP6064051B2 (ja) * | 2013-11-06 | 2017-01-18 | シャープ株式会社 | 窒化物半導体 |
US9306014B1 (en) * | 2013-12-27 | 2016-04-05 | Power Integrations, Inc. | High-electron-mobility transistors |
JP2017085006A (ja) * | 2015-10-29 | 2017-05-18 | 富士通株式会社 | 化合物半導体装置及びその製造方法 |
JP2018085414A (ja) * | 2016-11-22 | 2018-05-31 | 富士通株式会社 | 化合物半導体装置 |
CN109742144B (zh) * | 2019-01-28 | 2020-09-22 | 华南理工大学 | 一种槽栅增强型mishemt器件及其制作方法 |
JP2021118262A (ja) * | 2020-01-27 | 2021-08-10 | 株式会社東芝 | 半導体装置、半導体装置の製造方法、半導体装置の製造装置 |
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JP2006032911A (ja) * | 2004-06-15 | 2006-02-02 | Ngk Insulators Ltd | 半導体積層構造、半導体素子およびhemt素子 |
WO2009119356A1 (ja) * | 2008-03-24 | 2009-10-01 | 日本碍子株式会社 | 半導体素子用エピタキシャル基板、半導体素子、および半導体素子用エピタキシャル基板の作製方法 |
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US10347755B2 (en) * | 2013-06-06 | 2019-07-09 | Ngk Insulators, Ltd. | Group 13 nitride composite substrate semiconductor device, and method for manufacturing group 13 nitride composite substrate |
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