JP2005251877A - シリコン窒化膜の形成方法 - Google Patents
シリコン窒化膜の形成方法 Download PDFInfo
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- JP2005251877A JP2005251877A JP2004058214A JP2004058214A JP2005251877A JP 2005251877 A JP2005251877 A JP 2005251877A JP 2004058214 A JP2004058214 A JP 2004058214A JP 2004058214 A JP2004058214 A JP 2004058214A JP 2005251877 A JP2005251877 A JP 2005251877A
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- Prior art keywords
- silicon nitride
- nitride film
- silicon
- film
- forming
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- 229910052581 Si3N4 Inorganic materials 0.000 title claims abstract description 81
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000007789 gas Substances 0.000 claims abstract description 71
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 40
- 239000010703 silicon Substances 0.000 claims abstract description 40
- 239000003054 catalyst Substances 0.000 claims abstract description 30
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 28
- 239000001257 hydrogen Substances 0.000 claims description 39
- 229910052739 hydrogen Inorganic materials 0.000 claims description 39
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 30
- 239000000758 substrate Substances 0.000 claims description 27
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 26
- 229910021529 ammonia Inorganic materials 0.000 claims description 15
- VOSJXMPCFODQAR-UHFFFAOYSA-N ac1l3fa4 Chemical compound [SiH3]N([SiH3])[SiH3] VOSJXMPCFODQAR-UHFFFAOYSA-N 0.000 claims description 11
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 9
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 3
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 229910052702 rhenium Inorganic materials 0.000 claims description 3
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 239000010408 film Substances 0.000 description 108
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 36
- 239000000463 material Substances 0.000 description 32
- 238000004050 hot filament vapor deposition Methods 0.000 description 26
- 241000894007 species Species 0.000 description 24
- 238000000151 deposition Methods 0.000 description 22
- 230000008021 deposition Effects 0.000 description 20
- 239000010409 thin film Substances 0.000 description 16
- 239000002243 precursor Substances 0.000 description 14
- 238000005229 chemical vapour deposition Methods 0.000 description 12
- 238000005530 etching Methods 0.000 description 12
- 150000002431 hydrogen Chemical class 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 10
- 238000000354 decomposition reaction Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 239000010410 layer Substances 0.000 description 10
- 239000004065 semiconductor Substances 0.000 description 9
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910000077 silane Inorganic materials 0.000 description 7
- 229910052814 silicon oxide Inorganic materials 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 229910007991 Si-N Inorganic materials 0.000 description 4
- 229910006294 Si—N Inorganic materials 0.000 description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 125000004429 atom Chemical group 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 238000005121 nitriding Methods 0.000 description 3
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910021332 silicide Inorganic materials 0.000 description 2
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 2
- 241000079451 Prasma Species 0.000 description 1
- 229910052774 Proactinium Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000001182 laser chemical vapour deposition Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 125000001181 organosilyl group Chemical group [SiH3]* 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 229910052990 silicon hydride Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 230000002618 waking effect Effects 0.000 description 1
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- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
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- 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
- C23C16/04—Coating on selected surface areas, e.g. using masks
- C23C16/045—Coating cavities or hollow spaces, e.g. interior of tubes; Infiltration of porous substrates
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- 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
- C23C16/34—Nitrides
- C23C16/345—Silicon nitride
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- C—CHEMISTRY; METALLURGY
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- 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
- C23C16/44—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 method of coating
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- 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
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- H01L21/02107—Forming insulating materials on a substrate
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- H01L21/0217—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
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- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02277—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition the reactions being activated by other means than plasma or thermal, e.g. photo-CVD
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
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- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7833—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
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Abstract
【解決手段】 シリコンと窒素とを含む第1のガスと、窒素と水素とを含む第2のガスと、を減圧雰囲気において加熱した触媒に作用させることにより、シリコン窒化膜を形成することを特徴とするシリコン窒化膜の形成方法を提供する。
【選択図】 図1
Description
しかし、プラズマCVD法を用いた場合、プラズマによるウェーハのチャージアップなどの問題があり、65nmノード世代に代表される近年の超微細半導体装置においては、改善の余地がある。また一方、光CVD法を用いた場合には、荷電粒子などによる損傷はないものの、原料ガスの分解速度が低いために堆積速度が低く、量産に向かないという問題がある。
また、前記触媒は、タングステン(W)、白金(Pt)、パラジウム(Pd)、モリブデン(Mo)、タンタル(Ta)、チタン(Ti)、バナジウム(V)、レニウム(Re)、イリジウム(Ir)、シリコン(Si)及びアルミナ(AlOx)よりなる群から選択された少なくともいずかれを含むものとすることができる。
すなわちまず、触媒CVD法によれば、光CVD法と比較して、同一温度で成膜した場合に、密度が高く、純度も高い薄膜が得られる。例えば、原料としてシラン類やアミン類のような水素化物の原料を使用する場合には、薄膜に混入される水素の量を大幅に低下させることができる。
また、成膜雰囲気の圧力が高いと、バックグラウンドを構成する気体分子も成長フロントに高い頻度で衝突するため、薄膜の純度が低下しやすいという問題がある。
(1)触媒CVD法の場合、高温に加熱した触媒に原料ガスを作用させることにより、成膜プリカーサを極めて高い効率で生成することができるため、成膜雰囲気の圧力を従来の手法よりも大幅に下げることができる。
図1及び図2は、それぞれ本発明の実施の形態にかかるシリコン窒化膜の形成方法を表す模式図である。すなわち、本発明においては、図1に表したように、シリコン(Si)と窒素(N)とを含む第1の材料ガスと、窒素(N)と水素(H)とを含む第2の材料ガスと、を用いる。また、図2に表したように、水素(H2)をさらに追加することができる。
すなわち、触媒CVD装置は、反応室1と、その内部を排気する真空排気系6と、材料ガス供給系8〜10と、を有する。ガス供給系8からは、シリコン(Si)と窒素(N)とを含む第1の材料ガスが供給される。ガス供給系9からは、水素(H2)が供給される。ガス供給系10からは、窒素と水素とを含む第2の材料ガスが供給される。
触媒2により分解・活性化された粒子は、基板3の上に飛来し、シリコン窒化膜が堆積される。
すなわち、シリコンと窒素とを含む第1の材料ガスとしてトリシリルアミン(TSA)を15sccm、窒素と水素とを含む第2の材料ガスとしてアンモニア(NH3)を30sccm、および水素(H2)を50sccmを反応室1に導入した。トリシリルアミンは、材料ガス供給系8からマスフローコントローラにより流量を制御して反応室1に導入した。水素とアンモニアも同様に、材料ガス供給系9、10からそれぞれ導入した。
トリシリルアミン 15sccm
アンモニア 30sccm
水素 50sccm
触媒−基板間距離 75mm
触媒温度 1700℃
基板温度 350℃
成膜速度 20nm/分
屈折率 1.98
上記の結果から、本発明によれば、良好な膜質のシリコン窒化膜を実用的な成膜速度で形成できることが確認できた。そしてさらに、本実施例によれば、優れた段差被覆性が得られる。
まず、図4(a)は、シリコン窒化膜240を堆積する前の状態を表し、同図(b)は堆積後の状態を表す断面図である。ここでは、基板3として、半導体ウェーハなどの第1の層210の上に第2の層220がパターン形成された構造体が用いられている。すなわち、第2の層220がパターニングされて、溝Gが形成されている。この構造体を基板3として、その上にシリコン窒化膜240を堆積すると、図4(b)に表した如く、第2の層220の上と、溝Gの底及び側面Sにもシリコン窒化膜240がほぼ同一の膜厚に形成される。つまり、段差被覆性が良好である。
図7(a)に表したように、形成中のシリコン窒化膜240の表面には、飛来する堆積種が吸着する活性サイト240Aが存在する。材料ガスであるトリシリルアミンの分解により生成された主堆積種であるSiH3(シリル)やSi−N−Hx(シリコンと窒素と水素が結合した分子)やNH2などが形成中のシリコン窒化膜240の上面や溝Gの上部に飛来しても、図7(b)に表したように、これらの活性サイト240Aにトラップされてしまう。つまり、シリコン窒化膜240の表面での堆積種のマイグレート(migrate)が抑制されてしまう。そのため、溝Gの側壁Sや底面への堆積種の供給量が低下してしまい、溝Gの下部の膜厚が薄くなる原因となる。
図8は、水素(H2)を導入した場合のシリコン窒化膜の成長表面を表す概念図である。 材料ガスのひとつとして水素(H2)を導入すると、触媒2によって原子状水素に分解される。そして、シリコン窒化膜240表面の活性サイト240Aが、これら水素により終端される。このように水素により活性サイト240Aが終端された成長表面に飛来したSiH3、NH2などの堆積種は、その成長表面を長距離にわたってマイグレートできる。すなわち、同図(b)に矢印αで表した如く、溝Gの下方への堆積種の供給量が増加する。その結果として、段差被覆性を改善することができる。
しかしながら、水素を添加すると図8に表したように薄膜表面の活性サイト240Aの数が減じるため、窒化種であるNH2などの前駆体の吸着も抑制されて窒化が不十分なシリコン窒化膜となってしまう。つまり、屈折率が高くシリコンリッチのシリコン窒化膜が形成される。シリコンリッチな膜質のシリコン窒化膜は、電気抵抗が低下するためリーク電流が多くなり絶縁膜として好ましくない。また、フッ酸などによるエッチング速度も高くなり脆弱な膜となる。
つまり、材料ガスとしてシランとアンモニアを用いた場合、膜質を高いレベルに維持しつつ、段差被覆性を改善することが困難である。
図9は、本発明におけるシリコン窒化膜の成長表面を表す概念図である。
本発明においては、水素を導入することにより、図9(a)に表したように、シリコン窒化膜の表面の活性サイト240Aが終端され、飛来する堆積種がマイグレートしやすい状態が形成されている。
そしてさらに、材料ガスのひとつとして、シリコンと窒素とを含むガス(第1の材料ガス)を用いることにより、シリコンと窒素とが結合した状態の堆積種が形成されると考えられる。例えば、材料ガスのひとつとしてトリシリルアミンを用いた場合、触媒2によってシリコンと窒素とが完全に分離する訳ではなく、シリコンと窒素とが結合した状態の堆積種(Si−Nや、Si−N−Hxなど)が形成されるものと考えられる。このように、シリコンと窒素とが結合した状態の堆積種を供給することにより、シリコンの窒化が促進され、シリコンと窒素の組成比のバランスがとれた高い品質のシリコン窒化膜を形成することができる。
図10は、MOSFETの断面構造を例示する模式図である。
すなわち、シリコン基板の表面部分が素子分離領域101により絶縁分離され、これら分離されたウエル102のそれぞれにMOSFETが形成されている。それぞれのMOSFETは、ソース領域107、ドレイン領域108と、これらの間に設けられたチャネル103と、を有する。チャネル103の上には、ゲート絶縁膜104を介してゲート電極106が設けられている。ソース・ドレイン領域107、108とチャネル103との間には、いわゆる「ショートチャネル効果」などを防ぐ目的で、LDD(lightly doped drain)領域103Dが設けられている。そして、これらLDD領域103Dの上には、ゲート電極106に隣接してゲート側壁105が設けられている。ゲート側壁105は、LDD領域103Dをセルフアライン(自己整合)的に形成するために設けられている。
2 触媒
3 基板
4 基板ステージ
5 電源
6 真空排気系
7 シャワーヘッド
8 材料ガス供給系
101 素子分離領域
102 ウエル
103 チャネル
103D LDD領域
104 ゲート絶縁膜
105 ゲート側壁
106 ゲート電極
107 ソース領域
107 ドレイン領域
108 ドレイン領域
110 シリコン窒化膜
111 シリコン酸化膜(層間絶縁膜)
115D ドレイン配線
115G ゲート配線
115S ソース配線
119 シリサイド層
210 第1の層
220 第2の層
240 シリコン窒化膜
240A 活性サイト
Claims (8)
- シリコンと窒素とを含む第1のガスと、窒素と水素とを含む第2のガスと、を減圧雰囲気において加熱した触媒に作用させることにより、シリコン窒化膜を形成することを特徴とするシリコン窒化膜の形成方法。
- 前記第1のガスを前記触媒に作用させることにより分解し、シリコンと窒素とが結合した堆積種を形成することを特徴とする請求項1記載のシリコン窒化膜の形成方法。
- 前記第1のガスは、トリシリルアミン及びジシリルアミンの少なくともいずれかであることを特徴とする請求項1または2に記載のシリコン窒化膜の形成方法。
- 前記第2のガスは、アンモニア及びメチルアミンの少なくともいずれかであることを特徴とする請求項1〜3のいずれか1つに記載のシリコン窒化膜の形成方法。
- 前記第1のガス及び前記第2のガスとともに、水素を前記減圧雰囲気に導入することを特徴とする請求項1〜4のいずれか1つに記載のシリコン窒化膜の形成方法。
- 表面に段差あるいは溝が形成された基板の上に前記シリコン窒化膜を形成することを特徴とする請求項1〜5のいずれか1つに記載のシリコン窒化膜の形成方法。
- 前記触媒は、通電加熱された金属体であることを特徴とする請求項1〜6のいずれか1つに記載のシリコン窒化膜の形成方法。
- 前記触媒は、タングステン(W)、白金(Pt)、パラジウム(Pd)、モリブデン(Mo)、タンタル(Ta)、チタン(Ti)、バナジウム(V)、レニウム(Re)、イリジウム(Ir)、シリコン(Si)及びアルミナ(AlOx)よりなる群から選択された少なくともいずかれを含むことを特徴とする請求項1〜6のいずれか1つに記載のシリコン窒化膜の形成方法。
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US10494387B2 (en) | 2013-09-27 | 2019-12-03 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Halogen free syntheses of aminosilanes by catalytic dehydrogenative coupling |
US11274112B2 (en) | 2013-09-27 | 2022-03-15 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Halogen free syntheses of aminosilanes by catalytic dehydrogenative coupling |
US11780859B2 (en) | 2013-09-27 | 2023-10-10 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Halogen free syntheses of aminosilanes by catalytic dehydrogenative coupling |
US9777025B2 (en) | 2015-03-30 | 2017-10-03 | L'Air Liquide, Société pour l'Etude et l'Exploitation des Procédés Georges Claude | Si-containing film forming precursors and methods of using the same |
US10403494B2 (en) | 2015-03-30 | 2019-09-03 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Si-containing film forming precursors and methods of using the same |
US11699584B2 (en) | 2015-03-30 | 2023-07-11 | L'Air Liquide, Société Anonyme pour l'Edute ed l'Exploitation des Procédés Georges Claude | Si-containing film forming precursors and methods of using the same |
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US20050196977A1 (en) | 2005-09-08 |
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