JP5910802B1 - 炭化珪素半導体装置およびその製造方法 - Google Patents
炭化珪素半導体装置およびその製造方法 Download PDFInfo
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- JP5910802B1 JP5910802B1 JP2015560470A JP2015560470A JP5910802B1 JP 5910802 B1 JP5910802 B1 JP 5910802B1 JP 2015560470 A JP2015560470 A JP 2015560470A JP 2015560470 A JP2015560470 A JP 2015560470A JP 5910802 B1 JP5910802 B1 JP 5910802B1
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- silicon carbide
- impurity region
- groove
- epitaxial layer
- insulating film
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 154
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 154
- 239000004065 semiconductor Substances 0.000 title claims description 54
- 238000004519 manufacturing process Methods 0.000 title claims description 26
- 239000012535 impurity Substances 0.000 claims abstract description 108
- 239000007789 gas Substances 0.000 claims description 85
- 239000000758 substrate Substances 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 12
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 10
- 239000012298 atmosphere Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000003763 carbonization Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 114
- 210000000746 body region Anatomy 0.000 description 32
- 239000000523 sample Substances 0.000 description 22
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 12
- 230000007774 longterm Effects 0.000 description 12
- 229910052782 aluminium Inorganic materials 0.000 description 10
- 239000011229 interlayer Substances 0.000 description 10
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- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000001294 propane Substances 0.000 description 8
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- 235000012239 silicon dioxide Nutrition 0.000 description 8
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- 238000005468 ion implantation Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
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- 239000011810 insulating material Substances 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
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- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
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- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000003042 antagnostic effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 2
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- PEUPIGGLJVUNEU-UHFFFAOYSA-N nickel silicon Chemical compound [Si].[Ni] PEUPIGGLJVUNEU-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 2
- 239000005049 silicon tetrachloride Substances 0.000 description 2
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 2
- 239000005052 trichlorosilane Substances 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- UGACIEPFGXRWCH-UHFFFAOYSA-N [Si].[Ti] Chemical compound [Si].[Ti] UGACIEPFGXRWCH-UHFFFAOYSA-N 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- SLLGVCUQYRMELA-UHFFFAOYSA-N chlorosilicon Chemical compound Cl[Si] SLLGVCUQYRMELA-UHFFFAOYSA-N 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- BUMGIEFFCMBQDG-UHFFFAOYSA-N dichlorosilicon Chemical compound Cl[Si]Cl BUMGIEFFCMBQDG-UHFFFAOYSA-N 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229960001730 nitrous oxide Drugs 0.000 description 1
- 235000013842 nitrous oxide Nutrition 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
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- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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- 229910052719 titanium Inorganic materials 0.000 description 1
- -1 titanium aluminum silicon Chemical compound 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Classifications
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L29/7395—Vertical transistors, e.g. vertical IGBT
- H01L29/7396—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions
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- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
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Abstract
Description
最初に本開示の実施態様を列記して説明する。
〔6〕上記〔5〕において、ゲート絶縁膜57は、第1の溝部21上に設けられていてもよい。
次に本開示の一実施形態(以下「本実施形態」とも記す)を、図面を参照しつつ説明する。以下の図面において、同一または相当する部分には同一の参照番号を付し、それらについて同じ説明は繰り返さない。本明細書中、個別方位を[]、集合方位を<>、個別面を()、集合面を{}でそれぞれ示す。結晶学上の負の指数は、通常、数字の上に”−”(バー)を付すことによって表現されるが、本明細書では数字の前に負の符号を付すことによって表現する。
先ず、本実施形態に係る炭化珪素半導体装置であるMOSFET(Metal Oxide Semiconductor Field Effect Transistor)の構造について説明する。
次に、本実施形態に係るMOSFET1000が有するエピタキシャルウエハ100の構成について説明する。
次に、本実施形態に係るMOSFET1000の製造方法について説明する。
次に第1のエピタキシャル層を形成する工程が実行される。この工程では、C/Si比が1未満の原料ガスを用いて、炭化珪素基板110上に第1のエピタキシャル層121(図3を参照)を形成する。先ず、チャネル2内をガス置換した後、キャリアガスを流しながら、チャネル2内を所定の圧力、たとえば60mbar〜100mbar(6kPa〜10kPa)に調整する。キャリアガスは、たとえば水素(H2)ガス、アルゴン(Ar)ガス、ヘリウム(He)ガス等でよい。キャリアガス流量は、たとえば50slm〜200slm程度でよい。ここで流量の単位「slm(Standard Liter per Minute)」は、標準状態(0℃、101.3kPa)における「L/min」を示している。
次いで、第1のエピタキシャル層の表面を再構成する工程が実行される。表面を再構成する工程は、第1のエピタキシャル層を形成する工程と連続して実行されてもよい。あるいは、第1のエピタキシャル層を形成する工程と、表面を再構成する工程との間に、所定の休止時間を挟んでもよい。表面を再構成する工程では、サセプタ温度を10〜30℃程度上昇させてもよい。
第1のエピタキシャル層の表面を再構成した後、該表面に第2のエピタキシャル層を形成する工程が実行される。第2のエピタキシャル層122(図3を参照)は、C/Si比が1以上の原料ガスを用いて形成される。C/Si比は、1以上である限り、たとえば1.05以上でもよいし、1.1以上でもよいし、1.2以上でもよいし、1.3以上でもよいし、1.4以上でもよい。またC/Si比は、2.0以下でもよいし、1.8以下でもよいし、1.6以下でもよい。
1.サンプル作製
直径が150mmの炭化珪素基板110を準備した。炭化珪素基板110において第3の主面103は、オフ方向が<11−20>方向であり、(0001)面に対して4°のオフ角を有する。
各サンプルにおいて、炭化珪素エピタキシャル層120の第1の主面101に形成された溝部の形状を欠陥検査装置およびAFMを用いて評価した。結果を表1に示す。ここでは欠陥検査装置にレーザーテック株式会社製のWASAVIシリーズ「SICA 6X」(対物レンズ:×10)を用いた。
サンプル1および2において、前述のようにして、イオン注入工程(S40)および活性化アニール工程(S50)を実行し、図11に示す各種不純物領域を形成した。
サンプル1およびサンプル2において、前述のゲート電極形成工程(S70)〜パッド電極形成工程(S100)を順次実行した。さらにエピタキシャルウエハをダイシングすることにより、各サンプルからMOSFETであるチップ状の炭化珪素半導体装置をそれぞれ22個製造した。
Claims (8)
- 第1導電型を有する第1不純物領域と、前記第1不純物領域に接して設けられ、かつ前記第1導電型とは異なる第2導電型を有する第2不純物領域と、前記第2不純物領域によって前記第1不純物領域から隔てられ、かつ前記第1導電型を有する第3不純物領域とを含む炭化珪素エピタキシャル層と、
前記第1不純物領域と、前記第2不純物領域と、前記第3不純物領域とに接するゲート絶縁膜とを備え、
前記ゲート絶縁膜と接する前記第1不純物領域の表面には、前記表面に沿って一方向に延びるとともに、前記一方向における幅が前記一方向に垂直な方向における幅の2倍以上であり、かつ、前記表面からの最大深さが10nm以下である溝部が形成されており、
前記溝部は、第1の溝部と、前記第1の溝部に接続された第2の溝部とを含み、
前記第1の溝部は、前記一方向において前記溝部の一方の端部に形成され、
前記第2の溝部は、前記第1の溝部から前記一方向に沿って延びて前記一方の端部と反対側の他方の端部に至り、かつ、前記表面からの深さが前記第1の溝部の最大深さよりも小さい、炭化珪素半導体装置。 - 前記第1不純物領域の前記表面に対して平行な方向に沿った方向における、前記第1不純物領域の前記表面の幅は、1.5μm以上3.5μm以下である、請求項1に記載の炭化珪素半導体装置。
- 前記第1不純物領域の前記表面に対して垂直な方向における、前記ゲート絶縁膜の厚みは、40nm以上100nm以下である、請求項1または請求項2に記載の炭化珪素半導体装置。
- 前記ゲート絶縁膜および前記第1不純物領域の境界領域における窒素原子の密度は1018cm-3以上である、請求項1〜請求項3のいずれか1項に記載の炭化珪素半導体装置。
- 前記ゲート絶縁膜は、前記第1の溝部上に設けられている、請求項1に記載の炭化珪素半導体装置。
- 第1導電型を有する第1不純物領域と、前記第1不純物領域上に設けられ、かつ前記第1導電型とは異なる第2導電型を有する第2不純物領域と、前記第2不純物領域によって前記第1不純物領域から隔てられ、かつ前記第1導電型を有する第3不純物領域とを含む炭化珪素エピタキシャル層を準備する工程と、
前記第1不純物領域と、前記第2不純物領域と、前記第3不純物領域とに接するゲート絶縁膜を形成する工程とを備え、
前記ゲート絶縁膜と接する前記第1不純物領域の表面には、前記表面に沿って一方向に延びるとともに、前記一方向における幅が前記一方向に垂直な方向における幅の2倍以上であり、かつ、前記表面からの最大深さが10nm以下である溝部が形成されており、
前記溝部は、第1の溝部と、前記第1の溝部に接続された第2の溝部とを含み、
前記第1の溝部は、前記一方向において前記溝部の一方の端部に形成され、
前記第2の溝部は、前記第1の溝部から前記一方向に沿って延びて前記一方の端部と反対側の他方の端部に至り、かつ、前記表面からの深さが前記第1の溝部の最大深さよりも小さい、炭化珪素半導体装置の製造方法。 - 前記ゲート絶縁膜を形成する工程の後、窒素原子を含む雰囲気において、1100℃以上の温度で前記ゲート絶縁膜を加熱する工程をさらに備えた、請求項6に記載の炭化珪素半導体装置の製造方法。
- 前記炭化珪素エピタキシャル層を準備する工程の前に、炭化珪素基板を準備する工程をさらに備え、
前記炭化珪素エピタキシャル層を準備する工程は、
前記炭化珪素基板上に、C/Si比が1未満の原料ガスを用いて、第1のエピタキシャル層を形成する工程と、
C/Si比が1未満の原料ガスと、水素ガスとを含む混合ガスを用いて、第1のエピタキシャル層の表面を再構成する工程と、
再構成された前記第1のエピタキシャル層の前記表面に、C/Si比が1以上の原料ガスを用いて、第2のエピタキシャル層を形成する工程と、を含む、請求項6または請求項7に記載の炭化珪素半導体装置の製造方法。
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JP5577478B1 (ja) * | 2012-10-30 | 2014-08-20 | パナソニック株式会社 | 半導体装置 |
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JP6634914B2 (ja) | 2020-01-22 |
US9728628B2 (en) | 2017-08-08 |
JP6835192B2 (ja) | 2021-02-24 |
CN106796886B (zh) | 2020-05-01 |
JP2016149566A (ja) | 2016-08-18 |
JP2020047943A (ja) | 2020-03-26 |
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