JP2021507523A - シリコン基板上に炭化ケイ素を形成するための方法 - Google Patents
シリコン基板上に炭化ケイ素を形成するための方法 Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims abstract description 139
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 138
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 137
- 239000010703 silicon Substances 0.000 title claims abstract description 136
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000002243 precursor Substances 0.000 claims abstract description 90
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052738 indium Inorganic materials 0.000 claims abstract description 42
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims description 90
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 44
- 239000010410 layer Substances 0.000 claims description 31
- 229910052782 aluminium Inorganic materials 0.000 claims description 27
- 229910021529 ammonia Inorganic materials 0.000 claims description 22
- 239000004065 semiconductor Substances 0.000 claims description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 18
- 238000009792 diffusion process Methods 0.000 claims description 12
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 12
- 239000002356 single layer Substances 0.000 claims description 12
- 230000004888 barrier function Effects 0.000 claims description 10
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 10
- 238000000231 atomic layer deposition Methods 0.000 claims description 8
- 238000001451 molecular beam epitaxy Methods 0.000 claims description 8
- 238000010926 purge Methods 0.000 claims description 7
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910000077 silane Inorganic materials 0.000 claims description 6
- 238000004871 chemical beam epitaxy Methods 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000000927 vapour-phase epitaxy Methods 0.000 claims description 4
- 238000001947 vapour-phase growth Methods 0.000 claims 1
- 125000004429 atom Chemical group 0.000 description 25
- 239000007789 gas Substances 0.000 description 18
- 229910052733 gallium Inorganic materials 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 10
- 229910002601 GaN Inorganic materials 0.000 description 8
- 150000004767 nitrides Chemical class 0.000 description 8
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 6
- 229910003465 moissanite Inorganic materials 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 150000002902 organometallic compounds Chemical class 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 238000003795 desorption Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 235000012907 honey Nutrition 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000010952 in-situ formation Methods 0.000 description 2
- 239000003446 ligand Substances 0.000 description 2
- 238000004377 microelectronic Methods 0.000 description 2
- 238000012552 review Methods 0.000 description 2
- 229910002704 AlGaN Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- ORVACBDINATSAR-UHFFFAOYSA-N dimethylaluminum Chemical compound C[Al]C ORVACBDINATSAR-UHFFFAOYSA-N 0.000 description 1
- IGOGAEYHSPSTHS-UHFFFAOYSA-N dimethylgallium Chemical compound C[Ga]C IGOGAEYHSPSTHS-UHFFFAOYSA-N 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000407 epitaxy Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000009101 premedication Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 1
- RGGPNXQUMRMPRA-UHFFFAOYSA-N triethylgallium Chemical compound CC[Ga](CC)CC RGGPNXQUMRMPRA-UHFFFAOYSA-N 0.000 description 1
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 1
- IBEFSUTVZWZJEL-UHFFFAOYSA-N trimethylindium Chemical compound C[In](C)C IBEFSUTVZWZJEL-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/18—Epitaxial-layer growth characterised by the substrate
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/32—Carbides
- C23C16/325—Silicon carbide
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- C30—CRYSTAL GROWTH
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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
- C30B29/36—Carbides
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- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- 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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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02373—Group 14 semiconducting materials
- H01L21/02381—Silicon, silicon germanium, germanium
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Abstract
Description
本発明は一般に、半導体プロセス技術および装置に関する。より詳細には、本発明は一般に、シリコン基板の上部にIII族窒化物層をエピタキシャル堆積する間に、シリコン基板を保護するための改良された方法に関する。
GaNとも呼ばれる窒化ガリウムを含む半導体装置は、大電流を流して高電圧を支持する能力を有する。これにより、このような半導体装置はパワー半導体装置にとってますます望ましいものとなっている。近年、研究努力は、高出力/高周波応用のための装置の開発に焦点を当てた。一般に、これらのタイプの応用のために製造された装置は、高い電子移動度を示す装置構造に基づいており、HFETとも呼ばれるヘテロ接合電界効果トランジスタ、HEMTとも呼ばれる高電子移動度トランジスタ、またはMODFETとも呼ばれる変調ドープ電界効果トランジスタと呼ばれる。HEMTは、例えば、RF/マイクロ波電力増幅器または電力スイッチのようなアナログ回路応用に役立つ。このような装置は例えば100kHz〜100GHzの高周波数で動作しながら、例えば1000ボルトまでの高電圧に典型的に耐えることができる。
本発明の第1の態様によれば、上記の目的は、シリコン基板と、インジウムと複数の炭素原子とを含む第1の前駆体との反応によって、シリコン基板上に炭化ケイ素を形成するための方法によって実現される。
シリコン基板を反応チャンバ内に装填するステップと、
反応チャンバ内のシリコン基板を反応サイクルにかける(供する、曝す、付す)(subjecting)ステップであって、反応サイクルは、温度閾値を超える温度および分圧閾値を超える分圧で第1の前駆体を反応チャンバに供給し、それによってシリコン基板上に炭化ケイ素を形成する、ステップ。
シリコン基板と、
シリコン基板と、インジウムと複数の炭素原子とを含む第1の前駆体との反応によってシリコン基板上に形成された炭化ケイ素。
シリコン基板を反応チャンバ内に装填するステップと、
温度閾値を超える温度および分圧閾値を超える分圧で第1の前駆体を反応チャンバに供給することを含む反応サイクルに、反応チャンバ内のシリコン基板をかけるステップと、
を含む。
反応チャンバ内にシリコン基板を装填するステップと、
650℃〜1000℃の間に含まれる温度閾値を超える温度で、2〜10μモル/分の間に含まれる流量で、1×10−6mbarよりも大きい分圧で、第1の前駆体を反応チャンバに供給することを含む反応サイクルに、反応チャンバ内のシリコン基板をかけるステップと、
を含む。
図1Aおよび図1Bは、本発明による半導体構造物の一実施形態を概略的に示す図である。
図1Aに示す実施形態によれば、本発明による半導体構造物100は、反応チャンバ10内に装填される。半導体構造物100は、シリコン基板1と、シリコン基板1と、インジウムと複数の炭素原子とを含む第1の前駆体200との反応によってシリコン基板1上に形成された炭化ケイ素2とを含む。炭化ケイ素2は、温度閾値を超える温度および分圧閾値を超える分圧で第1の前駆体200をシリコン基板1上に供給するときに形成される。炭化ケイ素は、III族元素に対するシリコン基板1への拡散障壁として作用する。第1の前駆体200は、インジウムと、炭素原子を含む複数の有機分子とを含む。第1の前駆体200は、インジウムと、複数のメチル基とを含む。温度閾値は650℃〜1000℃の間に含まれ、分圧閾値は1×10−6mBarより大きく、好ましくは少なくとも40×10−6mBarである。図1Bに示される実施形態によれば、図1Aの半導体構造物100は、パージガス300または還元ガス301またはそれらの組み合わせに曝される。パージガス300は窒素であり、還元ガス301は水素である。反応チャンバ10は、例えば、MOCVD反応器、MBE反応器、ALD反応器、または化学ビームエピタキシー反応器におけるエピタキシャル成長のための反応チャンバである。炭化ケイ素2は、炭化ケイ素膜2である。炭化ケイ素1の厚さが所定の厚さ閾値を超えると、アンモニア201と、アルミニウムを含む第2の前駆体202とが反応チャンバ10に供給される。代替の実施形態によれば、シラン(silane)302を反応チャンバ10に供給することができる。
Claims (14)
- シリコン基板(1)と、インジウムと複数の炭素原子とを含む第1の前駆体(200)との反応によって、シリコン基板(1)上に炭化ケイ素(2)を形成することを特徴とする方法。
- 前記方法が、
前記シリコン基板(2)を反応チャンバ(10)内に装填するステップと、
前記反応チャンバ(10)内の前記シリコン基板(2)を反応サイクルにかけるステップであって、前記反応サイクルは、温度閾値を超える温度および分圧閾値を超える分圧で前記第1の前駆体(200)を前記反応チャンバ(10)に供給し、それによって前記シリコン基板(1)上に前記炭化ケイ素(2)を形成する、ステップと、
をさらに含むことを特徴とする、請求項1に記載の方法。 - 前記第1の前駆体(200)が、インジウムと、炭素原子を含む複数の有機分子とを含むことを特徴とする、請求項1または2に記載の方法。
- 前記第1の前駆体(200)が、インジウムと、複数のメチル基とを含むことを特徴とする、請求項1ないし3のいずれか1項に記載の方法。
- 前記反応チャンバ(10)内の前記シリコン基板(1)を反応サイクルにかけるステップが、
前記反応チャンバ(10)に、パージガス(300)、または還元ガス(301)、またはそれらの組み合わせを供給するステップをさらに含むことを特徴とする、請求項1ないし4のいずれか1項に記載の方法。 - 前記反応チャンバ(10)が、有機金属化学気相堆積反応器、または分子線エピタキシー反応器、または原子層堆積反応器、または化学ビームエピタキシー反応器、または有機金属気相エピタキシー反応器におけるエピタキシャル成長に適していることを特徴とする、請求項1ないし5のいずれか1項に記載の方法。
- 前記炭化ケイ素(2)が炭化ケイ素膜(2)を含むことを特徴とする、請求項1ないし6のいずれか1項に記載の方法。
- 前記方法は、
前記炭化ケイ素膜(2)の厚さが所定の厚さ閾値を超えると、アンモニア(201)と、アルミニウムを含む第2の前駆体(202)とを前記反応チャンバ(10)に供給し、それによって前記炭化ケイ素膜(2)の上部に窒化アルミニウム層(3)を成長させるステップをさらに含むことを特徴とする、請求項7に記載の方法。 - 前記所定の厚さ閾値は、炭化ケイ素の単層の厚さと炭化ケイ素の3nmとの間に含まれることを特徴とする、請求項8に記載の方法。
- 前記方法は、
前記アンモニア(201)および前記第2の前駆体(202)を前記反応チャンバ(10)に供給する前に、前記第1の前駆体(200)の前記反応チャンバ(10)への供給を一時停止するステップをさらに含むことを特徴とする、請求項8に記載の方法。 - 前記方法は、
前記アンモニア(201)および前記第2の前駆体(202)を前記反応チャンバ(10)に供給するときに、前記第1の前駆体(200)を、前記温度閾値を超える温度および前記分圧閾値を超える分圧で前記反応チャンバ(10)に供給し続けるステップを含むことを特徴とする、請求項8に記載の方法。 - 前記方法は、前記反応チャンバ(10)にシラン(302)を供給するステップをさらに含むことを特徴とする、請求項1ないし11のいずれか1項に記載の方法。
- 半導体構造物(100)であって、
シリコン基板(1)と、
前記シリコン基板(1)と、インジウムと複数の炭素原子とを含む第1の前駆体(200)との反応によって前記シリコン基板(1)上に形成された炭化ケイ素(2)と、
を含むことを特徴とする半導体構造物(100)。 - 前記炭化ケイ素(2)は、温度閾値を超える温度および分圧閾値を超える分圧で前記シリコン基板(1)上に前記第1の前駆体(200)を供給するときに形成され、前記炭化ケイ素(2)は、前記シリコン基板(1)内へのIII族元素に対する拡散障壁として作用することを特徴とする、請求項13に記載の半導体構造物(100)。
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