JP7058520B2 - シリコン膜の成膜方法及び基板処理装置 - Google Patents
シリコン膜の成膜方法及び基板処理装置 Download PDFInfo
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- JP7058520B2 JP7058520B2 JP2018038719A JP2018038719A JP7058520B2 JP 7058520 B2 JP7058520 B2 JP 7058520B2 JP 2018038719 A JP2018038719 A JP 2018038719A JP 2018038719 A JP2018038719 A JP 2018038719A JP 7058520 B2 JP7058520 B2 JP 7058520B2
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- film
- silicon film
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- forming
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 120
- 229910052710 silicon Inorganic materials 0.000 title claims description 120
- 239000010703 silicon Substances 0.000 title claims description 120
- 239000000758 substrate Substances 0.000 title claims description 49
- 238000000034 method Methods 0.000 title claims description 31
- 238000005530 etching Methods 0.000 claims description 70
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 60
- 230000015572 biosynthetic process Effects 0.000 claims description 12
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 229910000077 silane Inorganic materials 0.000 claims description 8
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 claims description 5
- 125000003277 amino group Chemical group 0.000 claims description 4
- 239000010408 film Substances 0.000 description 241
- 239000007789 gas Substances 0.000 description 86
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 32
- 235000012431 wafers Nutrition 0.000 description 30
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 16
- 238000001878 scanning electron micrograph Methods 0.000 description 13
- 239000000460 chlorine Substances 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 10
- 238000010926 purge Methods 0.000 description 9
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 8
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 7
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 7
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 7
- 229910052794 bromium Inorganic materials 0.000 description 7
- 229910052740 iodine Inorganic materials 0.000 description 7
- 239000011630 iodine Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 4
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 3
- 229910000043 hydrogen iodide Inorganic materials 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- LXEXBJXDGVGRAR-UHFFFAOYSA-N trichloro(trichlorosilyl)silane Chemical compound Cl[Si](Cl)(Cl)[Si](Cl)(Cl)Cl LXEXBJXDGVGRAR-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000005046 Chlorosilane Substances 0.000 description 1
- BIVNKSDKIFWKFA-UHFFFAOYSA-N N-propan-2-yl-N-silylpropan-2-amine Chemical compound CC(C)N([SiH3])C(C)C BIVNKSDKIFWKFA-UHFFFAOYSA-N 0.000 description 1
- CGRVKSPUKAFTBN-UHFFFAOYSA-N N-silylbutan-1-amine Chemical compound CCCCN[SiH3] CGRVKSPUKAFTBN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- KOPOQZFJUQMUML-UHFFFAOYSA-N chlorosilane Chemical compound Cl[SiH3] KOPOQZFJUQMUML-UHFFFAOYSA-N 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000011553 magnetic fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- H01L21/02164—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 oxide, e.g. SiO2
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Description
本発明の実施形態に係るシリコン膜の成膜方法が実施可能な基板処理装置について、バッチ式の縦型熱処理装置を例に挙げて説明する。図1は、本発明の実施形態に係る縦型熱処理装置の一例を示す断面図である。
本発明の実施形態に係るシリコン膜の成膜方法について説明する。図3は、本発明の実施形態に係るシリコン膜の成膜方法の一例を示すフローチャートである。
本発明の実施形態に係るシリコン膜の成膜方法の作用・効果を確認した実施例1について説明する。
実施例1において作製したサンプルについて説明する。
酸化膜が形成されたシリコン基板の上に膜厚が50Åのシリコン膜を成膜した後(成膜工程S1)、シリコン膜をエッチバックし(エッチング工程S2)、膜厚が19Å、20Å、21Å、23Å、25Å、26Åのシリコン膜を形成した。シリコン基板及び酸化膜は下地の一例であり、シリコン膜はピンホールの有無を評価する対象の膜の一例である。膜厚が19Å、20Å、21Å、23Å、25Å、26Åのシリコン膜が形成されたシリコン基板を、それぞれサンプル1A、1B、1C、1D、1E、1Fとした。また、成膜工程S1及びエッチング工程S2におけるプロセス条件は以下の通りである。
・成膜工程S1(シード層形成ステップ)
基板温度:380℃
処理容器34内の圧力:1.0Torr(133.3Pa)
ガス:DIPAS
・成膜工程S1(シリコン膜成膜ステップ)
基板温度:470℃
処理容器34内の圧力:3.0Torr(399.9Pa)
ガス:DCS/SiH4
・エッチング工程S2
基板温度:550℃
処理容器34内の圧力:20~80Torr(2666~10666Pa)
ガス:HBr
(サンプル2A~2G)
酸化膜が形成されたシリコン基板の上に膜厚が25Å、27.7Å、33.7Å、34.8Å、39.5Å、42.8Å、54.7Åのシリコン膜を成膜した。膜厚が25Å、27.7Å、33.7Å、34.8Å、39.5Å、42.8Å、54.7Åのシリコン膜が形成されたシリコン基板を、それぞれサンプル2A、2B、2C、2D、2E、2F、2Gとした。なお、成膜工程S1におけるプロセス条件はサンプル1A~1F1と同様である。
酸化膜が形成されたシリコン基板の上に膜厚が50Åのシリコン膜を成膜した後(成膜工程S1)、シリコン膜をエッチバックし(エッチング工程S2)、膜厚が15Åのシリコン膜を形成し、サンプル3Aとした。なお、成膜工程S1及びエッチング工程S2におけるプロセス条件は以下の通りである。
・成膜工程S1(シード層形成ステップ)
基板温度:380℃
処理容器34内の圧力:1.0Torr(133.3Pa)
ガス:DIPAS
・成膜工程S1(第2のシリコン膜成膜ステップ)
基板温度:380℃
処理容器34内の圧力:1.0Torr(133.3Pa)
ガス:Si2H6
・成膜工程S1(シリコン膜成膜ステップ)
基板温度:470℃
処理容器34内の圧力:3.0Torr(399.9Pa)
ガス:DCS/SiH4
・エッチング工程S2
基板温度:550℃
処理容器34内の圧力:20~80Torr(2666~10666Pa)
ガス:HBr
(サンプル4A)
酸化膜が形成されたシリコン基板の上に膜厚が15Åのシリコン膜を成膜し、サンプル4Aとした。なお、成膜工程S1におけるプロセス条件はサンプル3Aと同様である。
シリコン膜の表面のピンホールの有無の評価方法について説明する。図4は、ピンホールの有無の評価方法の説明図である。図4(a)はシリコン基板の上に酸化膜及びシリコン膜を成膜したサンプルの概略断面及び走査型電子顕微鏡(SEM:Scanning Electron Microscope)による表面画像を示す。図4(b)は図4(a)のサンプルを0.5wt%のDHF(希フッ酸)に10分間を浸したサンプルの概略断面及び表面SEM像を示す。図4(c)は図4(b)のサンプルを33℃に調温した2.5%のTMAH(水酸化テトラメチルアンモニウム)に浸したサンプルの概略断面及び表面SEM像を示す。
サンプル1B及びサンプル2Aについて、前述の評価方法により、シリコン膜の表面のピンホールの有無を評価した。図5及び図6は酸化膜の表面SEM像を示す図であり、それぞれサンプル1B及びサンプル2Aの酸化膜の表面SEM像を示す。
サンプル3A及びサンプル4Aについて、前述の評価方法により、シリコン膜の表面のピンホールの有無を評価した。図7及び図8は酸化膜の表面SEM像を示す図であり、それぞれサンプル3A及びサンプル4Aの酸化膜の表面SEM像を示す。
サンプル1A~1F及びサンプル2A~2Gについて、前述の評価方法により、シリコン膜の表面のピンホール数を評価した。図9は、シリコン膜の膜厚とピンホール数との関係を示す図である。図9中、横軸はシリコン膜の膜厚(Å)を示し、縦軸はシリコン膜の表面のピンホール数(個)(観察エリア:約1.2μm×0.9μm)を示す。また、図9中、丸印はサンプル1A~1Fを示し、三角印はサンプル2A~2Gを示す。
実施例2では、エッチングガスの一例であるHBrを用いた場合に得られるシリコン膜の断面形状及び表面形状について、SEM及び原子間力顕微鏡(AFM:Atomic Force Microscope)により評価した。また、比較のために、エッチングガスとして塩素(Cl2)を用いた場合に得られるシリコン膜の断面形状及び表面形状についても同様に評価した。
実施例3では、エッチングガスの一例であるHBrのa-Si膜に対するエッチング速度の温度依存性について評価した。また、比較のために、Cl2のa-Si膜に対するエッチング速度の温度依存性についても評価した。
202 酸化膜
203 シリコン膜
204 ピンホール
205 凹部
Claims (6)
- 凹凸が形成された下地の上にピンホールが生じない膜厚のアモルファスシリコン膜を成膜する成膜工程と、
前記アモルファスシリコン膜に少なくともBr 2 ガス、HBrガス、I 2 ガス、HIガスのいずれかを含むエッチングガスを供給して前記アモルファスシリコン膜の膜厚を減ずるエッチング工程と、
を有し、
前記成膜工程は、前記下地の前記凹凸に対してコンフォーマルに前記アモルファスシリコン膜を成膜し、
前記エッチング工程は、前記下地の前記凹凸に成膜された前記アモルファスシリコン膜をコンフォーマルにエッチングする、
シリコン膜の成膜方法。 - 前記成膜工程は、
前記下地にアミノシラン系ガスを供給して前記下地の表面にシード層を形成するシード層形成ステップと、
前記シード層にアミノ基を含まないシラン系ガスを供給して前記シード層の上にアモルファスシリコン膜を成膜するシリコン膜成膜ステップと、
を有する、
請求項1に記載のシリコン膜の成膜方法。 - 前記シード層形成ステップと前記シリコン膜成膜ステップとの間に、前記シード層に前記シリコン膜成膜ステップで用いられる前記シラン系ガスよりも高次のシラン系ガスを供給する第2のシリコン膜成膜ステップを有する、
請求項2に記載のシリコン膜の成膜方法。 - 前記成膜工程と前記エッチング工程とは、同一の処理室内で連続して行われる、
請求項1乃至3のいずれか一項に記載のシリコン膜の成膜方法。 - 前記エッチング工程は、前記成膜工程よりも高い温度で行われる、
請求項1乃至4のいずれか一項に記載のシリコン膜の成膜方法。 - 凹凸が形成された基板を収容する処理容器と、
前記処理容器内へ成膜ガス及びエッチングガスを導入するガス供給手段と、
前記基板の上にピンホールが生じない膜厚のアモルファスシリコン膜を成膜する成膜工程と、前記アモルファスシリコン膜に少なくともBr 2 ガス、HBrガス、I 2 ガス、HIガスのいずれかを含むエッチングガスを供給して前記アモルファスシリコン膜の膜厚を減ずるエッチング工程と、を実行するように制御する制御手段と、
を備え、
前記成膜工程は、前記基板の前記凹凸に対してコンフォーマルに前記アモルファスシリコン膜を成膜し、
前記エッチング工程は、前記基板の前記凹凸に成膜された前記アモルファスシリコン膜をコンフォーマルにエッチングする、
基板処理装置。
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