JP2018101694A - Iii族窒化物半導体基板、及び、iii族窒化物半導体基板の製造方法 - Google Patents
Iii族窒化物半導体基板、及び、iii族窒化物半導体基板の製造方法 Download PDFInfo
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- JP2018101694A JP2018101694A JP2016246908A JP2016246908A JP2018101694A JP 2018101694 A JP2018101694 A JP 2018101694A JP 2016246908 A JP2016246908 A JP 2016246908A JP 2016246908 A JP2016246908 A JP 2016246908A JP 2018101694 A JP2018101694 A JP 2018101694A
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- nitride semiconductor
- iii nitride
- group iii
- substrate
- growth
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- 239000000758 substrate Substances 0.000 title claims abstract description 263
- 239000004065 semiconductor Substances 0.000 title claims abstract description 261
- 150000004767 nitrides Chemical class 0.000 title claims abstract description 257
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 229910052594 sapphire Inorganic materials 0.000 claims abstract description 97
- 239000010980 sapphire Substances 0.000 claims abstract description 97
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 239000013078 crystal Substances 0.000 claims description 40
- 239000012159 carrier gas Substances 0.000 description 24
- 238000005121 nitriding Methods 0.000 description 12
- 239000007789 gas Substances 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 9
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 230000010287 polarization Effects 0.000 description 6
- 230000005699 Stark effect Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 238000005530 etching Methods 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 3
- CAVCGVPGBKGDTG-UHFFFAOYSA-N alumanylidynemethyl(alumanylidynemethylalumanylidenemethylidene)alumane Chemical compound [Al]#C[Al]=C=[Al]C#[Al] CAVCGVPGBKGDTG-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000003776 cleavage reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 230000007017 scission Effects 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical group [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- 229910026551 ZrC Inorganic materials 0.000 description 2
- OTCHGXYCWNXDOA-UHFFFAOYSA-N [C].[Zr] Chemical compound [C].[Zr] OTCHGXYCWNXDOA-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- WHJFNYXPKGDKBB-UHFFFAOYSA-N hafnium;methane Chemical compound C.[Hf] WHJFNYXPKGDKBB-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 2
- 125000004433 nitrogen atom Chemical group N* 0.000 description 2
- 125000002524 organometallic group Chemical group 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910003468 tantalcarbide Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 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
- 230000008033 biological extinction Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- YXJYBPXSEKMEEJ-UHFFFAOYSA-N phosphoric acid;sulfuric acid Chemical compound OP(O)(O)=O.OS(O)(=O)=O YXJYBPXSEKMEEJ-UHFFFAOYSA-N 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- RVOMEIZTHYMDKM-UHFFFAOYSA-N triethylalumane;trimethylalumane Chemical compound C[Al](C)C.CC[Al](CC)CC RVOMEIZTHYMDKM-UHFFFAOYSA-N 0.000 description 1
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H01L21/02104—Forming layers
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- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/02247—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by nitridation, e.g. nitridation of the substrate
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- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
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- C30B29/406—Gallium nitride
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Abstract
【解決手段】サファイア基板を準備する基板準備工程S10と、サファイア基板に対して熱処理を行う熱処理工程S20と、サファイア基板上に金属含有ガスを供給する先流し工程S30と、サファイア基板上に、成長温度:800℃以上950℃以下、圧力:30torr以上200torr以下の成長条件で、バッファ層を形成するバッファ層形成工程S40と、バッファ層の上に、成長温度:800℃以上1025℃以下、圧力:30torr以上200torr以下、成長速度:10μm/h以上の成長条件で、III族窒化物半導体層を形成する成長工程S50と、を有するIII族窒化物半導体基板の製造方法を提供する。
【選択図】図3
Description
III族窒化物半導体結晶で構成され、膜厚が400μm以上であり、表裏の関係にある露出した第1及び第2の主面はいずれも半極性面であり、前記第1及び第2の主面各々に対してエックス線をIII族窒化物半導体結晶のc軸の投影軸に平行に入射し測定したXRC(X-ray Rocking Curve)の半値幅の差が、100arcsec以下であるIII族窒化物半導体基板が提供される。
サファイア基板と、
前記サファイア基板上に形成され、半極性かつN極性の露出した主面を有するIII族窒化物半導体層と、
を有するIII族窒化物半導体基板が提供される。
サファイア基板を準備する基板準備工程と、
前記基板準備工程の後、前記サファイア基板に対して熱処理を行う熱処理工程と、
前記熱処理工程の後、前記サファイア基板上に金属含有ガスを供給する先流し工程と、
前記先流し工程の後、前記サファイア基板上に、成長温度:800℃以上950℃以下、圧力:30torr以上200torr以下の成長条件で、バッファ層を形成するバッファ層形成工程と、
前記バッファ層形成工程の後、前記バッファ層の上に、成長温度:800℃以上1025℃以下、圧力:30torr以上200torr以下、成長速度:10μm/h以上の成長条件で、III族窒化物半導体層を形成する成長工程と、
を有するIII族窒化物半導体基板の製造方法が提供される。
圧力:30torr以上760torr以下
熱処理時間:5分以上20分以下
キャリアガス:H2、又は、H2とN2(H2比率0〜100%)
キャリアガス供給量:3slm以上50slm以下(ただし、成長装置のサイズにより供給量は変動する為、これに限定されない。)
圧力:30torr以上200torr以下
トリメチルアルミニウム供給量、供給時間:20ccm以上500ccm以下、1秒
以上60秒以下
キャリアガス:H2、又は、H2とN2(H2比率0〜100%)
キャリアガス供給量:3slm以上50slm以下(ただしガスの供給量は成長装置のサイズや構成により変動する為、これに限定されない。)
成長温度:800℃以上950℃以下
圧力:30torr以上200torr以下
トリメチルアルミニウム供給量:20ccm以上500ccm以下
NH3供給量:0.5slm以上10slm以下
キャリアガス:H2、又は、H2とN2(H2比率0〜100%)
キャリアガス供給量:3slm以上50slm以下(ただしガスの供給量は成長装置のサイズや構成により変動する為、これに限定されない。)
成長温度:800℃以上1025℃以下
圧力:30torr以上200torr以下
TMGa供給量:25sccm以上1000sccm以下
NH3供給量:1slm以上20slm以下
キャリアガス:H2、又は、H2とN2(H2比率0〜100%)
キャリアガス供給量:3slm以上50slm以下(ただしガスの供給量は成長装置のサイズや構成により変動する為、これに限定されない。)
成長速度:10μm/h以上
第1の評価では、上述した「III族窒化物半導体層の成長面の面方位を、N極性側の面とするための複数の要素」のすべてを満たすことで、III族窒化物半導体層の成長面の面方位をN極性側の面にできることを確認した。また、上述した「III族窒化物半導体層の成長面の面方位を、N極性側の面とするための複数の要素」の中の少なくとも1つを満たさなかった場合、III族窒化物半導体層の成長面の面方位がGa極性側の面になることを確認した。
圧力:100torr
キャリアガス:H2、N2
熱処理時間:10分または15分
キャリアガス供給量:15slm
温度:800〜930℃
圧力:100torr
トリメチルアルミニウム供給量、供給時間:90sccm、10秒
キャリアガス:H2、N2
キャリアガス供給量:15slm
成長温度:800〜930℃
圧力:100torr
トリメチルアルミニウム供給量:90sccm
NH3供給量:5slm
キャリアガス:H2、N2
キャリアガス供給量:15slm
圧力:100torr
TMGa供給量:50〜500sccm(連続変化)
NH3供給量:5〜10slm(連続変化)
キャリアガス:H2、N2
キャリアガス供給量:15slm
成長速度:10μm/h以上
第2の評価では、上述した「III族窒化物半導体層の成長面の面方位を調整するための複数の要素」を調整することで、III族窒化物半導体層の成長面の面方位を調整できることを確認した。
圧力:200torr
熱処理時間:10分
キャリアガス:H2、N2
キャリアガス供給量:15slm
温度:880〜930℃
圧力:100torr
トリメチルアルミニウム供給量、供給時間:90sccm、10秒
キャリアガス:H2、N2
キャリアガス供給量:15slm
圧力:100torr
V/III比:5184
TMAl供給量:90ccm
NH3供給量:5slm
キャリアガス:H2、N2
キャリアガス供給量:15slm
成長温度:900〜1100℃
圧力:100torr
V/III比:321
TMGa供給量:50〜500ccm(ランプアップ)
NH3供給量:5〜10slm(ランプアップ)
キャリアガス:H2、N2
キャリアガス供給量:15slm
本手法により作製したサンプルの結晶性について評価した。試料は3種類を準備した。サンプルAは、本明細記載の手法により作製したものであり、{11−23}面を成長面としている。サンプルB、Cは比較用サンプルであり、サンプルBは{10−10}面を成長面とした。また、サンプルCは{11−22}面を成長面とした。
1. III族窒化物半導体結晶で構成され、膜厚が400μm以上であり、表裏の関係にある露出した第1及び第2の主面はいずれも半極性面であり、前記第1及び第2の主面各々に対してエックス線をIII族窒化物半導体結晶のc軸の投影軸に平行に入射し測定したXRC(X-ray Rocking Curve)の半値幅の差が、100arcsec以下であるIII族窒化物半導体基板。
2. 1に記載のIII族窒化物半導体基板において、
前記第1及び第2の主面の前記半値幅は、いずれも、エックス線をIII族窒化物半導体結晶のc軸の投影軸に平行に入射し測定したエックス線ロッキングカーブ(XRC)半値幅が500arcsec以下であるIII族窒化物半導体基板。
3. サファイア基板と、
前記サファイア基板上に形成され、半極性かつN極性の露出した主面を有するIII族窒化物半導体層と、
を有するIII族窒化物半導体基板。
4. 3に記載のIII族窒化物半導体基板において、
前記III族窒化物半導体層の膜厚は、1μm以上であるIII族窒化物半導体基板。
5. 3又は4に記載のIII族窒化物半導体基板において、
前記III族窒化物半導体層の前記主面のXRCの半値幅は、c投影軸方向で500arcsec以下であるIII族窒化物半導体基板。
6. サファイア基板を準備する基板準備工程と、
前記基板準備工程の後、前記サファイア基板に対して熱処理を行う熱処理工程と、
前記熱処理工程の後、前記サファイア基板上に金属含有ガスを供給する先流し工程と、
前記先流し工程の後、前記サファイア基板上に、成長温度:800℃以上950℃以下、圧力:30torr以上200torr以下の成長条件で、バッファ層を形成するバッファ層形成工程と、
前記バッファ層形成工程の後、前記バッファ層の上に、成長温度:800℃以上1025℃以下、圧力:30torr以上200torr以下、成長速度:10μm/h以上の成長条件で、III族窒化物半導体層を形成する成長工程と、
を有するIII族窒化物半導体基板の製造方法。
7. 6に記載のIII族窒化物半導体基板の製造方法において、
前記成長工程の後に、前記III族窒化物半導体層と前記サファイア基板とを含む積層体から、前記サファイア基板を剥離する剥離工程をさらに有するIII族窒化物半導体基板の製造方法。
11 第1の主面
12 第2の主面
20 III族窒化物半導体基板
21 サファイア基板
22 バッファ層
23 III族窒化物半導体層
24 成長面
III族窒化物半導体結晶で構成され、
膜厚が400μm以上であり、
表裏の関係にある露出した第1及び第2の主面はいずれも半極性面であり、
前記第1の主面に対してエックス線をIII族窒化物半導体結晶のc軸を前記第1の主面に投影した投影軸に平行に入射し、エックス線の入射方向と前記第1の主面のなす角度を走査して測定したXRCの半値幅と、前記第2の主面に対してエックス線をIII族窒化物半導体結晶のc軸を前記第2の主面に投影した投影軸に平行に入射し、エックス線の入射方向と前記第2の主面のなす角度を走査して測定したXRCの半値幅との差が、100arcsec以下であるIII族窒化物半導体基板が提供される。
サファイア基板と、
前記サファイア基板上に形成されたIII族窒化物半導体層と、
を有し、
前記III族窒化物半導体層の主面は、半極性面であり、ミラー指数(hkml)で表され、lが0未満であるIII族窒化物半導体基板が提供される。
サファイア基板と、
前記サファイア基板上に形成されたIII族窒化物半導体層と、
を有し、
前記III族窒化物半導体層の主面は、半極性面であり、ミラー指数(hkml)で表され、lが0未満であり、
前記III族窒化物半導体層の前記主面に対してエックス線をIII族窒化物半導体結晶のc軸を前記主面に投影した投影軸に平行に入射し、エックス線の入射方向と前記主面のなす角度を走査して測定したXRC(X-ray Rocking Curve)の半値幅は、500arcsec以下であるIII族窒化物半導体基板が提供される。
サファイア基板と、
前記サファイア基板上に形成されたIII族窒化物半導体層と、
を有し、
前記III族窒化物半導体層の主面は、半極性面であり、ミラー指数(hkml)で表され、lが0未満であり、
前記III族窒化物半導体層の膜厚は400μm以上であり、
前記III族窒化物半導体層の前記主面と表裏の関係にある前記III族窒化物半導体層の裏面は半極性面であり、
前記主面に対してエックス線をIII族窒化物半導体結晶のc軸を前記主面に投影した投影軸に平行に入射し、エックス線の入射方向と前記主面のなす角度を走査して測定したXRCの半値幅と、前記裏面に対してエックス線をIII族窒化物半導体結晶のc軸を前記裏面に投影した投影軸に平行に入射し、エックス線の入射方向と前記裏面のなす角度を走査して測定したXRCの半値幅との差が、100arcsec以下であるIII族窒化物半導体基板が提供される。
サファイア基板を準備する基板準備工程と、
前記基板準備工程の後、前記サファイア基板に対して熱処理を行う熱処理工程と、
前記熱処理工程の後、前記サファイア基板上に金属含有ガスを供給する先流し工程と、
前記先流し工程の後、前記サファイア基板上に、成長温度:800℃以上950℃以下、圧力:30torr以上200torr以下の成長条件で、バッファ層を形成するバッファ層形成工程と、
前記バッファ層形成工程の後、前記バッファ層の上に、成長温度:800℃以上1025℃以下、圧力:30torr以上200torr以下、成長速度:10μm/h以上の成長条件で、III族窒化物半導体層を形成する成長工程と、 を有し、
前記先流し工程では、前記金属含有ガスとしてトリメチルアルミニウムを供給し、
前記バッファ層形成工程では、AlNからなる前記バッファ層を形成するIII族窒化物半導体基板の製造方法が提供される。
Claims (7)
- III族窒化物半導体結晶で構成され、膜厚が400μm以上であり、表裏の関係にある露出した第1及び第2の主面はいずれも半極性面であり、前記第1及び第2の主面各々に対してエックス線をIII族窒化物半導体結晶のc軸の投影軸に平行に入射し測定したXRC(X-ray Rocking Curve)の半値幅の差が、100arcsec以下であるIII族窒化物半導体基板。
- 請求項1に記載のIII族窒化物半導体基板において、
前記第1及び第2の主面の前記半値幅は、いずれも、エックス線をIII族窒化物半導体結晶のc軸の投影軸に平行に入射し測定したエックス線ロッキングカーブ(XRC)半値幅が500arcsec以下であるIII族窒化物半導体基板。 - サファイア基板と、
前記サファイア基板上に形成され、半極性かつN極性の露出した主面を有するIII族窒化物半導体層と、
を有するIII族窒化物半導体基板。 - 請求項3に記載のIII族窒化物半導体基板において、
前記III族窒化物半導体層の膜厚は、1μm以上であるIII族窒化物半導体基板。 - 請求項3又は4に記載のIII族窒化物半導体基板において、
前記III族窒化物半導体層の前記主面のXRCの半値幅は、c投影軸方向で500arcsec以下であるIII族窒化物半導体基板。 - サファイア基板を準備する基板準備工程と、
前記基板準備工程の後、前記サファイア基板に対して熱処理を行う熱処理工程と、
前記熱処理工程の後、前記サファイア基板上に金属含有ガスを供給する先流し工程と、
前記先流し工程の後、前記サファイア基板上に、成長温度:800℃以上950℃以下、圧力:30torr以上200torr以下の成長条件で、バッファ層を形成するバッファ層形成工程と、
前記バッファ層形成工程の後、前記バッファ層の上に、成長温度:800℃以上1025℃以下、圧力:30torr以上200torr以下、成長速度:10μm/h以上の成長条件で、III族窒化物半導体層を形成する成長工程と、
を有するIII族窒化物半導体基板の製造方法。 - 請求項6に記載のIII族窒化物半導体基板の製造方法において、
前記成長工程の後に、前記III族窒化物半導体層と前記サファイア基板とを含む積層体から、前記サファイア基板を剥離する剥離工程をさらに有するIII族窒化物半導体基板の製造方法。
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