JP2022150973A - 基板処理方法及び基板処理装置 - Google Patents
基板処理方法及び基板処理装置 Download PDFInfo
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- 238000003672 processing method Methods 0.000 title abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 181
- 238000000034 method Methods 0.000 claims abstract description 107
- 238000005530 etching Methods 0.000 claims abstract description 43
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 20
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 16
- 150000002367 halogens Chemical class 0.000 claims abstract description 16
- 125000004433 nitrogen atom Chemical group N* 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims description 62
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 30
- 229910052710 silicon Inorganic materials 0.000 claims description 30
- 239000010703 silicon Substances 0.000 claims description 30
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 16
- 229910021529 ammonia Inorganic materials 0.000 claims description 8
- -1 ammonium halide Chemical class 0.000 claims description 6
- 150000002366 halogen compounds Chemical class 0.000 claims description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 5
- 125000003277 amino group Chemical group 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 229910000039 hydrogen halide Inorganic materials 0.000 claims description 4
- 239000012433 hydrogen halide Substances 0.000 claims description 4
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 7
- 238000002407 reforming Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 52
- 238000002474 experimental method Methods 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910052581 Si3N4 Inorganic materials 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 229910052731 fluorine Inorganic materials 0.000 description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 6
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 5
- 229910052794 bromium Inorganic materials 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009616 inductively coupled plasma Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 150000001350 alkyl halides Chemical class 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910000042 hydrogen bromide Inorganic materials 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
- 230000001681 protective effect Effects 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005513 bias potential Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- GZUXJHMPEANEGY-UHFFFAOYSA-N bromomethane Chemical compound BrC GZUXJHMPEANEGY-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- HRYZWHHZPQKTII-UHFFFAOYSA-N chloroethane Chemical compound CCCl HRYZWHHZPQKTII-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 229960003750 ethyl chloride Drugs 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000013529 heat transfer fluid Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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Abstract
Description
プラズマ処理システムは、容量結合プラズマ処理装置1及び制御部2を含む。容量結合プラズマ処理装置1は、プラズマ処理チャンバ10、ガス供給部20、電源30及び排気システム40を含む。また、プラズマ処理装置1は、基板支持部11及びガス導入部を含む。ガス導入部は、少なくとも1つの処理ガスをプラズマ処理チャンバ10内に導入するように構成される。ガス導入部は、シャワーヘッド13を含む。基板支持部11は、プラズマ処理チャンバ10内に配置される。シャワーヘッド13は、基板支持部11の上方に配置される。一実施形態において、シャワーヘッド13は、プラズマ処理チャンバ10の天部(ceiling)の少なくとも一部を構成する。プラズマ処理チャンバ10は、シャワーヘッド13、プラズマ処理チャンバ10の側壁10a及び基板支持部11により規定されたプラズマ処理空間10sを有する。プラズマ処理チャンバ10は、少なくとも1つの処理ガスをプラズマ処理空間10sに供給するための少なくとも1つのガス供給口と、プラズマ処理空間からガスを排出するための少なくとも1つのガス排出口とを有する。側壁10aは接地される。シャワーヘッド13及び基板支持部11は、プラズマ処理チャンバ10筐体とは電気的に絶縁される。
第1実験では、シリコン窒化膜とシリコン窒化膜上のマスクMKとを備える基板Wを準備した。その後、上記プラズマ処理システムを用いて基板Wに対して上記方法MT1を実行した。まず、工程ST1を実施した。工程ST1において、第1処理ガスは、水素ガス、酸素ガス及びフルオロカーボンガスの混合ガスである。工程ST1では、第1プラズマP1を用いて、シリコン窒化膜に凹部R1を形成すると同時に、凹部R1の側壁R1sに第1層F1を形成した。次に、工程ST2を実施した。工程ST2において、第2処理ガスは、臭化水素(HBr)ガスである。工程ST2では、臭化水素ガスを第1層F1と反応させて、第1層F1を第2層F2に改質した。次に、工程ST3を実施した。工程ST3において、第3処理ガスは、第1処理ガスと同じである。工程ST3では、凹部R1の底部R1bをエッチングすると同時に、凹部R1の側壁R1sに第1層F1を形成した。すなわち、工程ST3は、工程ST3の後の工程ST1と同時に行われた。工程ST1~工程ST3を繰り返し行った。
第2実験では、第2処理ガスとして、臭化水素ガスに代えてアルゴンガスを用いた。その他の条件は第1実験と同じである。
第1実験及び第2実験において方法MT1が実行された基板Wの凹部R1の断面を観察して、図8に示される凹部R1の幅WDの最大値及びマスクMKの厚さTHを測定した。凹部R1の側壁の寸法不良(ボーイング)が抑制されていると、凹部R1の幅WDの最大値は小さくなる。マスクMKのエッチングが抑制されていると、マスクMKの厚さTHは大きくなる。測定結果を以下に示す。
Claims (14)
- エッチング対象膜と前記エッチング対象膜上に設けられ開口を有するマスクとを備える基板を処理する方法であって、
(a)前記開口に対応して前記エッチング対象膜に設けられた凹部の側壁に、第1処理ガスを用いて、窒素原子及び水素原子を含む第1層を形成する工程と、
(b)前記(a)の後、ハロゲン含有ガスを含む第2処理ガスを用いて、前記第1層を第2層に改質する工程と、
(c)前記(b)の後、第3処理ガスを用いて、前記凹部をエッチングする工程と、
を含む、方法。 - 前記(a)では、前記第1処理ガスから生成される第1プラズマを用い、
前記(c)では、前記第3処理ガスから生成される第2プラズマを用い、
前記(b)では、プラズマを生成することなく、前記ハロゲン含有ガスを含む前記第2処理ガスを用いる、請求項1に記載の方法。 - 前記(c)の後、前記(a)と前記(b)と前記(c)とを繰り返す工程を更に含む、請求項1又は2に記載の方法。
- 前記(c)は、前記(c)の後の前記(a)と同時に行われる、請求項3に記載の方法。
- 前記エッチング対象膜はシリコン含有膜を含む、請求項1~4のいずれか一項に記載の方法。
- 前記シリコン含有膜は窒素を含有するシリコン含有膜を含み、
前記第1処理ガスは水素原子を含む、請求項5に記載の方法。 - 前記シリコン含有膜は窒素を含有しないシリコン含有膜を含み、
前記第1処理ガスは水素原子及び窒素原子を含む、請求項5又は6に記載の方法。 - 前記ハロゲン含有ガスは、極性を有するハロゲン化合物を含む、請求項1~7のいずれか一項に記載の方法。
- 前記ハロゲン化合物はハロゲン化水素を含む、請求項8に記載の方法。
- 前記第1層は、アンモニア、又はアミノ基を有する化合物を含む、請求項1~9のいずれか一項に記載の方法。
- 前記第2層は、ハロゲン化アンモニウム又はハロゲン化アミンを含む、請求項1~10のいずれか一項に記載の方法。
- 前記(c)において、前記基板を支持するための基板支持部にバイアス電力が印加される、請求項1~11のいずれか一項に記載の方法。
- チャンバと、
前記チャンバ内において基板を支持するための基板支持部であり、前記基板は、エッチング対象膜と前記エッチング対象膜上に設けられ開口を有するマスクとを備える、基板支持部と、
第1処理ガス、第2処理ガス及び第3処理ガスの少なくとも1つを前記チャンバ内に供給するように構成されたガス供給部であり、前記第2処理ガスはハロゲン含有ガスを含む、ガス供給部と、
制御部と、
を備え、
前記制御部は、
(a)前記開口に対応して前記エッチング対象膜に設けられた凹部の側壁に、前記第1処理ガスを用いて、窒素原子及び水素原子を含む第1層を形成し、
(b)前記(a)の後、前記第2処理ガスを用いて、前記第1層を第2層に改質し、
(c)前記(b)の後、前記第3処理ガスを用いて、前記凹部をエッチングするように、前記ガス供給部を制御するように構成される、基板処理装置。 - エッチング対象膜と前記エッチング対象膜上に設けられ開口を有するマスクとを備える基板を処理する方法であって、
(a)第1処理ガスに前記基板を晒す工程であり、前記第1処理ガスは、前記開口に対応して前記エッチング対象膜に設けられた凹部の側壁に、窒素原子及び水素原子を含む第1層を形成可能である、工程と、
(b)前記(a)の後、ハロゲン含有ガスを含む第2処理ガスに前記基板を晒す工程であり、前記第2処理ガスは、前記第1層を第2層に改質可能である、工程と、
(c)前記(b)の後、第3処理ガスに前記基板を晒す工程であり、前記第3処理ガスは、前記凹部をエッチング可能である、工程と、
を含む、方法。
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