JP7250566B2 - 基板処理装置および基板処理方法 - Google Patents
基板処理装置および基板処理方法 Download PDFInfo
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- JP7250566B2 JP7250566B2 JP2019033189A JP2019033189A JP7250566B2 JP 7250566 B2 JP7250566 B2 JP 7250566B2 JP 2019033189 A JP2019033189 A JP 2019033189A JP 2019033189 A JP2019033189 A JP 2019033189A JP 7250566 B2 JP7250566 B2 JP 7250566B2
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- 239000000758 substrate Substances 0.000 title claims description 82
- 238000003672 processing method Methods 0.000 title claims description 5
- 239000007788 liquid Substances 0.000 claims description 154
- 239000000126 substance Substances 0.000 claims description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 69
- 239000002904 solvent Substances 0.000 claims description 66
- 238000000034 method Methods 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 27
- 238000005530 etching Methods 0.000 claims description 21
- 238000011282 treatment Methods 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims 1
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 75
- 235000012431 wafers Nutrition 0.000 description 72
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 29
- 239000008367 deionised water Substances 0.000 description 28
- 229910021641 deionized water Inorganic materials 0.000 description 28
- 239000000243 solution Substances 0.000 description 22
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 17
- 238000001035 drying Methods 0.000 description 15
- 238000003860 storage Methods 0.000 description 7
- 238000001312 dry etching Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000011068 loading method Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000005368 silicate glass Substances 0.000 description 3
- 238000001039 wet etching Methods 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 238000007614 solvation Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- MSXVEPNJUHWQHW-UHFFFAOYSA-N 2-methylbutan-2-ol Chemical compound CCC(C)(C)O MSXVEPNJUHWQHW-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 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
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- GDFCWFBWQUEQIJ-UHFFFAOYSA-N [B].[P] Chemical compound [B].[P] GDFCWFBWQUEQIJ-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920002189 poly(glycerol 1-O-monomethacrylate) polymer Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000000352 supercritical drying Methods 0.000 description 1
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- H01L21/67075—Apparatus for fluid treatment for etching for wet etching
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
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- B05B12/004—Arrangements for controlling delivery; Arrangements for controlling the spray area comprising sensors for monitoring the delivery, e.g. by displaying the sensed value or generating an alarm
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
- B05B12/1418—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet for supplying several liquids or other fluent materials in selected proportions to a single spray outlet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
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- B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
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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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- H01L21/02057—Cleaning during device manufacture
- H01L21/0206—Cleaning during device manufacture during, before or after processing of insulating layers
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- H01L21/04—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
- 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
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
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- H—ELECTRICITY
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Description
HF ⇔ H+ + F-
HF + H2O ⇔ H3O+ + F-
HF +F- ⇔ HF2 -
以下に、図2に示す第1実施形態に係る処理液供給系30A、あるいは、図3に示す第2実施形態に係る処理液供給系30Bを用いてウエハWに施される一連の液処理について説明する。
図5に記載された積層膜構造を有するウエハWが、基板搬送装置17(図1参照)により処理ユニット16内に搬入され、スピンチャック16Sにより保持される。
スピンチャック16Sは、ウエハWを予め定められた回転速度で鉛直軸線周りに回転させる。ウエハWの回転は、ウエハWに対する一連の液処理が終了するまで継続する。ウエハWの回転速度は、必要に応じて変化させられる。
上記薬液処理工程を予め定められた時間だけ実行したら、ノズル51からの処理液の供給が停止されるとともに、別のノズル54からリンス液例えばDIWがウエハWに供給される。このリンス液により、薬液処理工程で用いた処理液および反応生成物が洗い流される。図面の簡略化のため、ノズル54およびこのノズル54にDIWを供給する別の純水供給部44は、図2の最も左側の処理ユニット16にのみ表示している。
上記リンス工程を予め定められた時間だけ実行したら、ウエハWを引き続き回転させたまま(好ましくは回転速度を増し)ノズル54からのリンス液を停止し、ウエハWの振り切り乾燥が行われる。振り切り乾燥の前に、さらに別のノズル(ノズル54と同様のノズル)から乾燥用液体例えばIPAをウエハWに供給して、ウエハW上にあるDIWをIPAに置換しておいてもよい。乾燥方法は上記には限定されず、ウエハW上にあるDIWをIPAに置換した後に、振り切り乾燥を行う代わりに、他の処理ユニットで超臨界乾燥を行ってもよい。
[基板搬出工程]
乾燥工程が終了したら、基板搬送装置17が、スピンチャック16SからウエハWを受け取り、処理ユニット16外に搬出する。
次に、図4に示す第3実施形態に係る処理液供給系30Cを用いてウエハWに施される一連の液処理について説明する。この場合も、ウエハWは処理開始から処理終了までの間回転し続ける。基板搬入工程、リンス工程、乾燥工程および基板搬出工程は、第1、第2実施形態の場合の動作と同じであるため、説明は省略する。なお、以下の説明においては、プリウエット液として供給されるDIW、およびリンス液として供給されるDIWは、DHFを供給するためのノズル51から供給されるものとする。この場合、純水供給源に接続されるとともに流れ制御機器が介設された純水ラインが、分岐ライン37のリキッドフローコントローラ39の下流側に接続される。
ウエハWを保持するスピンチャック16SがウエハWを予め定められた回転速度(例えば1000rpm程度)で回転させる。ウエハWの回転速度は、乾燥工程が開始されるまでの間ずっと1000rpm程度に維持される(但し、変化させても構わない)。
次に、ノズル51とノズル52との中間点が概ねウエハWの中心の真上に位置するようにノズル51およびノズル52を移動させる。この状態で、ノズル52からのIPA吐出流量を例えば300ml/min程度まで減少させるとともに、ノズル51からウエハWの中心部にDHFを供給し(吐出流量は例えば700ml/min程度)する。この状態を例えば3秒程度継続し、ウエハWの表面がDHFとIPAとの混合液体の液膜に覆われるようにする(図6(D)を参照)。つまりこの実施形態では、低誘電率溶媒であるIPAは、ウエハWに供給された後にDHFと混合され、純水、薬液(HF)および低誘電率溶媒からなる処理液が生成されることになる。ノズル51からのDHFの吐出流量およびノズル52からのIPA吐出流量は、予め実験により求めた適切な純水、薬液および低誘電率溶媒の混合比が得られるような値に制御される。
次に、ノズル51をウエハWの中心の真上に移動させるとともに、ノズル52をウエハWの中心の真上からさらにずれた位置に移動させる。この状態で、ノズル51からのDHFの吐出を維持したまま(吐出流量は例えば1500ml/min程度)、ノズル52からのIPAの吐出を停止する。この状態を例えば3秒程度継続し、ウエハWの表面がDHFの液膜に覆われるようにする(図6(E)を参照)。
上記薬液処理工程を予め定められた時間だけ実行したら、ノズル51からのDHFの吐出およびノズル52からのIPAの吐出を停止し、ウエハWの中心の真上に位置させたノズル51からDIWを吐出することにより、リンス処理を行うことができる(図6(A)を参照)。
4 制御部(制御装置)
16S 基板保持部
30A,30B,30C 処理液供給部(処理液供給系)
41 薬液供給部
42 純水供給部
43 低誘電率溶媒供給部
Claims (7)
- 複数の膜が形成された基板を保持する基板保持部と、
前記基板保持部により保持された前記基板に処理液を供給する処理液供給部と、
前記処理液供給部に、前記処理液の構成成分としての薬液を供給する薬液供給部と、
前記処理液供給部に、前記処理液の構成成分としての純水を供給する純水供給部と、
前記処理液供給部に、前記処理液の構成成分としての低誘電率溶媒を供給する低誘電率溶媒供給部と、
前記薬液供給部、前記純水供給部、前記低誘電率溶媒供給部を制御して、前記処理液中に含まれる前記薬液、前記純水および前記低誘電率溶媒の比率を調節する制御部と、を備え、
前記制御部は、前記基板に前記処理液を供給している間に、前記処理液中の前記薬液、前記純水および前記低誘電率溶媒の混合比を変化させることにより、前記複数の膜のうちの一つの膜の他の膜に対するエッチング選択比を変化させる、基板処理装置。 - 前記処理液供給部は、
前記薬液、前記純水および前記低誘電率溶媒を混合して前記処理液を生成する混合部と、
前記混合部により生成された前記処理液を、前記基板保持部により保持された前記基板に吐出するノズルと、
を有している請求項1記載の基板処理装置。 - 前記混合部は、
前記薬液供給部から供給された前記薬液と前記純水供給部から供給された前記純水とを混合して純水希釈薬液を生成する第1混合部と、
前記第1混合部で生成された前記純水希釈薬液と前記低誘電率溶媒供給部から供給された前記低誘電率溶媒とを混合して前記処理液を生成する第2混合部と、を含み、
前記ノズルは、前記第2混合部で生成された前記処理液を吐出する、請求項2記載の基板処理装置。 - 前記処理液供給部は、
前記薬液および前記純水を混合して純水希釈薬液を生成する混合部と、
前記混合部により生成された前記純水希釈薬液を、前記基板保持部により保持された前記基板に吐出する第1ノズルと、
前記低誘電率溶媒供給部から供給された前記低誘電率溶媒を、前記基板保持部により保持された前記基板に吐出する第2ノズルと、
を有し、
前記純水希釈薬液と前記低誘電率溶媒とが前記基板上で混合されることにより前記処理液が生成される
請求項1記載の基板処理装置。 - 基板に形成された複数の膜をエッチングする基板処理方法であって、
前記基板に、薬液、純水および低誘電率溶媒を混合してなる処理液を供給し、前記基板上に形成された前記複数の膜をエッチングするエッチング工程と、
前記エッチング工程の後に、前記基板にリンス液を供給するリンス工程と、
を備え、
前記基板に前記処理液を供給している間に、前記処理液中の前記薬液、前記純水および前記低誘電率溶媒の混合比を変化させることにより、前記複数の膜のうちの一つの膜の他の膜に対するエッチング選択比を変化させる、基板処理方法。 - 前記エッチング工程において、前記薬液、前記純水および前記低誘電率溶媒が混合された後に、ノズルから前記処理液として前記基板に吐出される、請求項5記載の基板処理方法。
- 前記エッチング工程において、前記薬液および前記純水を混合することにより生成された純水希釈薬液と、前記低誘電率溶媒と、が別々のノズルから前記基板に吐出され、前記基板上で混合されて前記処理液が生成される、請求項5記載の基板処理方法。
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