JP6727186B2 - 窒化物半導体素子の製造方法 - Google Patents
窒化物半導体素子の製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 78
- 150000004767 nitrides Chemical class 0.000 title claims description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000000203 mixture Substances 0.000 claims description 107
- 229910002704 AlGaN Inorganic materials 0.000 claims description 68
- 239000013078 crystal Substances 0.000 claims description 56
- 239000000758 substrate Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 13
- 239000010410 layer Substances 0.000 description 141
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 99
- 238000005253 cladding Methods 0.000 description 20
- 230000007423 decrease Effects 0.000 description 7
- 239000012535 impurity Substances 0.000 description 5
- -1 nitride compound Chemical class 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910002601 GaN Inorganic materials 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000011669 selenium Substances 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- RNQKDQAVIXDKAG-UHFFFAOYSA-N aluminum gallium Chemical compound [Al].[Ga] RNQKDQAVIXDKAG-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical group [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000005566 electron beam evaporation Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001451 molecular beam epitaxy Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000000927 vapour-phase epitaxy Methods 0.000 description 1
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- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/40—AIIIBV compounds wherein A is B, Al, Ga, In or Tl and B is N, P, As, Sb or Bi
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- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/40—AIIIBV compounds wherein A is B, Al, Ga, In or Tl and B is N, P, As, Sb or Bi
- C30B29/403—AIII-nitrides
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Description
以下に説明する実施の形態は、本発明を実施する上での好適な具体例として示すものであり、技術的に好ましい種々の技術的事項を具体的に例示している部分もあるが、本発明の技術的範囲は、この具体的態様に限定されるものではない。また、各図面における各構成要素の寸法比は、必ずしも実際の窒化物半導体素子の寸法比と一致するものではない。
図1は、窒化物半導体素子の構成を概略的に示す縦断面図である。窒化物半導体素子1には、例えば、トランジスタ、レーザダイオード(Laser Diode:LD)、発光ダイオード(Light Emitting Diode:LED)等が含まれる。本実施の形態では、窒化物半導体素子1(以下、単に「半導体素子1」ともいう。)として、紫外領域の波長の光(特に、中心波長が250nm〜350nmの深紫外光)を発する発光ダイオードを例に挙げて説明する。
次に、図2及び図3を参照して、n型クラッド層30を形成するn−AlGaNの結晶の品質(単に、「結晶品質」ともいう。なお、「結晶性」との表現を用いることもできる。)と半導体素子の発光出力との関係を説明する。発明者らは、n型クラッド層30を形成するn−AlGaNの結晶品質と半導体素子1の発光出力との関係を評価することを目的として、n−AlGaNのミックス値(以下、単に「n−AlGaNミックス値」ともいう。)と半導体素子1の発光出力との関係を調べる実験を行った。ここで、n−AlGaNミックス値とは、n−AlGaN結晶の(10−12)面(Mixed面)に対するX線回折のωスキャンにより得られるX線ロッキングカーブの半値幅(arcsec)であり、n−AlGaNの結晶品質を示す代表的な指標の一例である。n−AlGaNミックス値は、値が小さいほどn−AlGaNの結晶品質が良いことを意味する。
次に、図4及び図5を参照して、AlNのミックス値(以下、単に「AlNミックス値」ともいう。)とn−AlGaNミックス値との関係を説明する。AlNミックス値は、AlN層22を形成するAlNの結晶の(10−12)面(Mixed面)に対するX線回折のωスキャンにより得られるX線ロッキングカーブの半値幅(arcsec)であり、AlNの結晶品質を示す代表的な指標の一例である。AlNミックス値は、値が小さいほどAlNの結晶品質が良いことを意味する。発明者らは、鋭意検討の結果、AlNミックス値とn−AlGaNミックス値と間には相関関係があることを見出した。以下、詳細を説明する。
次に、半導体素子1の製造方法について説明する。基板10上にバッファ層20、n型クラッド層30、活性層40、電子ブロック層50、p型クラッド層70を、この順に連続的に高温成長させて形成する。これら層の成長には、有機金属化学気相成長法(Metal Organic Chemical Vapor Deposition:MOCVD)、分子線エピタキシ法(Molecular Beam Epitaxy:MBE)、ハライド気相エピタキシ法(Halide Vapor Phase Epitaxy:NVPE)等の周知のエピタキシャル成長法を用いて形成することができる。
次に、以上説明した実施の形態から把握される技術思想について、実施の形態における符号等を援用して記載する。ただし、以下の記載における各符号等は、特許請求の範囲における構成要素を実施の形態に具体的に示した部材等に限定するものではない。
[2]前記AlN層(22)を形成する工程は、成長温度を変更する工程、Gaのドーピング量を変更する工程、及び前記AlN層(22)の膜厚を変更する工程のうち少なくとも1つ以上の工程を含む、前記[1]に記載の窒化物半導体素子(1)の製造方法。
2…下地構造部
10…基板
20…バッファ層
22…AlN層
24…u−AlpGa1−pN層
30…n型クラッド層
30a…露出面
40…活性層
42,42a,42b,42c…障壁層
44,44a,44b,44c…井戸層
50…電子ブロック層
70…p型クラッド層
80…p型コンタクト層
90…n側電極
92…p側電極
Claims (2)
- 基板上にAlN層を形成する工程と、
前記AlN層上に、前記AlN層の結晶品質に応じた結晶品質を有するn型AlGaNを形成する工程と、
を備える窒化物半導体素子の製造方法であって、
前記n型AlGaNを形成する工程は、結晶品質を表すn型AlGaNミックス値が500(arcsec)以下となるように前記n型AlGaNを形成し、
前記AlN層を形成する工程は、前記n型AlGaNのAl組成比が60%以上70%未満の場合、前記AlN層の結晶品質を表すAlNミックス値が460(arcsec)未満となり、前記n型AlGaNのAl組成比が50%以上60%未満の場合、前記AlNミックス値が410(arcsec)よりも大きくかつ506(arcsec)未満となり、前記n型AlGaNのAl組成比が40%以上50%未満の場合、前記AlNミックス値が418(arcsec)よりも大きくかつ473(arcsec)未満となるように前記AlN層を形成する、
窒化物半導体素子の製造方法。 - 前記AlN層を形成する工程は、成長温度を変更する工程、Gaのドーピング量を変更する工程、及び前記AlN層の膜厚を変更する工程のうち少なくとも1つ以上の工程を含む、
請求項1に記載の窒化物半導体素子の製造方法。
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JP2017254379A JP6727186B2 (ja) | 2017-12-28 | 2017-12-28 | 窒化物半導体素子の製造方法 |
CN201880084421.3A CN111587492B (zh) | 2017-12-28 | 2018-10-31 | 氮化物半导体元件和氮化物半导体元件的制造方法 |
US16/958,497 US20210066546A1 (en) | 2017-12-28 | 2018-10-31 | Nitride semiconductor element and nitride semiconductor element production method |
PCT/JP2018/040540 WO2019130805A1 (ja) | 2017-12-28 | 2018-10-31 | 窒化物半導体素子及び窒化物半導体素子の製造方法 |
TW107138726A TWI677999B (zh) | 2017-12-28 | 2018-11-01 | 氮化物半導體元件以及氮化物半導體元件的製造方法 |
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TWI281757B (en) * | 2004-03-18 | 2007-05-21 | Showa Denko Kk | Group III nitride semiconductor light-emitting device and producing method thereof |
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JP2010232700A (ja) * | 2010-07-20 | 2010-10-14 | Showa Denko Kk | Iii族窒化物半導体発光素子の製造方法 |
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