JP7415594B2 - 基板処理方法及び基板処理装置 - Google Patents
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- 238000012545 processing Methods 0.000 title claims description 147
- 239000000758 substrate Substances 0.000 title claims description 45
- 238000003672 processing method Methods 0.000 title claims description 8
- 239000007789 gas Substances 0.000 claims description 119
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000007795 chemical reaction product Substances 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 10
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 6
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 6
- 229910052736 halogen Inorganic materials 0.000 claims description 5
- 150000002367 halogens Chemical class 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- 230000008016 vaporization Effects 0.000 claims description 2
- 235000012431 wafers Nutrition 0.000 description 96
- 229910004298 SiO 2 Inorganic materials 0.000 description 34
- 238000005530 etching Methods 0.000 description 34
- 238000000034 method Methods 0.000 description 24
- 230000008569 process Effects 0.000 description 22
- 238000000859 sublimation Methods 0.000 description 12
- 230000008022 sublimation Effects 0.000 description 12
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- 238000006243 chemical reaction Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
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- 238000010586 diagram Methods 0.000 description 4
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- 238000010926 purge Methods 0.000 description 4
- 239000012530 fluid Substances 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
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- -1 ammonia fluorosilicate Chemical group 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- H01L21/3105—After-treatment
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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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- H01L21/02123—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
- 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
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- H01L21/02107—Forming insulating materials on a substrate
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- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
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- H01L21/02321—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer
- H01L21/02329—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer introduction of nitrogen
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- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
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Description
前記処理容器内を第1の圧力とした状態で、前記基板にハロゲン含有ガス及び塩基性ガスを含む処理ガスを供給し、前記シリコン含有膜を変質させて反応生成物を生成する第1の工程と、
前記処理容器内を前記第1の圧力よりも低い第2の圧力として、前記反応生成物を気化させる第2の工程と、
前記第1の工程と前記第2の工程とを交互に繰り返し行う繰り返し工程と、
前記繰り返し工程における2回目以降の前記第1の工程は、前記反応生成物が残留している基板に前記処理ガスを供給する工程を含む。
本開示の一実施形態に係る基板処理装置1について、図1の縦断側面図を参照しながら説明する。この基板処理装置1は真空雰囲気が形成される処理容器11内に、表面にSiO2膜が形成されたウエハWを格納し、背景技術の項目で述べたCOR処理によって当該SiO2膜をエッチングする装置である。より具体的に述べると、基板処理装置1は、HFガス及びNH3ガスを処理ガスとして上記のウエハWに供給し、SiO2膜を変質させて反応生成物を生成させる処理と、処理ガスの供給を停止して、反応生成物を昇華させる処理と、を行い、SiO2膜を除去する。上記の反応生成物は、アンモニアフルオロシリケート(AFS)である。
続いて、第2の実施形態について第1の実施形態との差異点を中心に説明する。この第2の実施形態では、上記の各第2の期間の長さが比較的短くなるように処理が行われる。この第2の実施形態で処理されるウエハWのSiO2膜42については、図7Aに示すように、その表面から下方側(ウエハWの底面側)に向かう割れとして、シーム46が形成されているものとする。
本開示の技術に関連して行われた評価試験について説明する。表面にSiO2膜が形成された複数のウエハWについて、第1の実施形態で説明したエッチング処理を行った。このエッチング処理については、ウエハW毎に第2の期間におけるバルブ24の開度、即ち第2の期間における処理容器11内の圧力を変更して行った。そして、処理後の各ウエハWについて、面内各部のSiO2膜のエッチング量の平均値(単位:Å)と、Uniformity(単位:%)と、を測定した。Uniformityとは、(エッチング量の最大値-エッチング量の最小値)/(エッチング量の平均値)である。従って、Uniformityの値が低いほど、ウエハWの面内におけるエッチング量の均一性が高い。この評価試験では、第2の期間の時間は15秒に設定した。
11 処理容器
43 処理ガス
44 AFS層
Claims (6)
- 表面にシリコン含有膜が形成された基板を処理容器内に格納する工程と、
前記処理容器内を第1の圧力とした状態で、前記基板にハロゲン含有ガス及び塩基性ガスを含む処理ガスを供給し、前記シリコン含有膜を変質させて反応生成物を生成する第1の工程と、
前記処理容器内を前記第1の圧力よりも低い第2の圧力として、前記反応生成物を気化させる第2の工程と、
前記第1の工程と前記第2の工程とを交互に繰り返し行う繰り返し工程と、
前記繰り返し工程における2回目以降の前記第1の工程は、前記反応生成物が残留している基板に前記処理ガスを供給する工程を含む基板処理方法。 - 前記シリコン含有膜は、シリコン酸化膜またはシリコン窒化膜である請求項1記載の基板処理方法。
- 前記シリコン含有膜はシリコン酸化膜である請求項2記載の基板処理方法。
- 前記ハロゲン含有ガスはフッ化水素ガスであり、前記塩基性ガスはアンモニアガスである請求項1ないし3のいずれか一つに記載の基板処理方法。
- 前記第2の圧力は、前記第1の圧力の15%以上である請求項1ないし4のいずれか一つに記載の基板処理方法。
- 表面にシリコン含有膜が形成された基板を格納する処理容器と、
前記処理容器内の圧力を変更する圧力変更機構と、
前記処理容器内にハロゲン含有ガス及び塩基性ガスを含む処理ガスを供給する処理ガス供給機構と、
前記シリコン含有膜を変質させて反応生成物を生成するために、前記処理容器内を第1の圧力とした状態で、前記基板に前記処理ガスを供給する第1のステップと、
前記反応生成物を気化させるために、前記処理容器内を前記第1の圧力よりも低い第2の圧力とする第2のステップと、前記第1のステップと第2のステップとを交互に繰り返し行う繰り返しステップと、を行い、前記繰り返しステップにおける2回目以降の前記第1のステップは、前記反応生成物が残留している基板に前記処理ガスを供給するステップとなるように制御信号を出力する基板処理装置。
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JP2020010284A JP7415594B2 (ja) | 2020-01-24 | 2020-01-24 | 基板処理方法及び基板処理装置 |
TW110100919A TW202141627A (zh) | 2020-01-24 | 2021-01-11 | 基板處理方法及基板處理裝置 |
KR1020210003802A KR102550949B1 (ko) | 2020-01-24 | 2021-01-12 | 기판 처리 방법 및 기판 처리 장치 |
CN202110058361.1A CN113178387A (zh) | 2020-01-24 | 2021-01-15 | 基板处理方法以及基板处理装置 |
US17/151,421 US11887861B2 (en) | 2020-01-24 | 2021-01-18 | Substrate processing method and substrate processing apparatus |
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