JP7359159B2 - 付着物除去方法及び成膜方法 - Google Patents
付着物除去方法及び成膜方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 67
- 230000015572 biosynthetic process Effects 0.000 title description 2
- 239000007789 gas Substances 0.000 claims description 119
- 238000002161 passivation Methods 0.000 claims description 79
- 229910052717 sulfur Inorganic materials 0.000 claims description 47
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 46
- 239000011593 sulfur Substances 0.000 claims description 46
- 238000004140 cleaning Methods 0.000 claims description 43
- 239000000758 substrate Substances 0.000 claims description 35
- 150000001875 compounds Chemical class 0.000 claims description 32
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 30
- 239000001257 hydrogen Substances 0.000 claims description 18
- 229910052739 hydrogen Inorganic materials 0.000 claims description 18
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 13
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 239000002245 particle Substances 0.000 description 16
- 239000004065 semiconductor Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 13
- 239000011261 inert gas Substances 0.000 description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 229910052732 germanium Inorganic materials 0.000 description 5
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 125000004434 sulfur atom Chemical group 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 235000012431 wafers Nutrition 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- KXNLCSXBJCPWGL-UHFFFAOYSA-N [Ga].[As].[In] Chemical compound [Ga].[As].[In] KXNLCSXBJCPWGL-UHFFFAOYSA-N 0.000 description 2
- 150000004770 chalcogenides Chemical class 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 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
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 229910018503 SF6 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 1
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
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Description
これらの半導体材料は、シリコン材料と比較してモビリティ(移動度)が高いというメリットを有しているものの、成膜が困難である場合や、材料間の界面の欠陥密度が高くなる場合があった。
チャンバーの内面やチャンバーの下流側に配された配管の内面に硫黄を含有する付着物が付着した状態で、ウエハ等の基板をチャンバー内に導入すると、チャンバー内を真空にして不活性ガスで置換した際に硫黄のパーティクルがウエハ等の基板に付着するおそれがあった。そして、硫黄のパーティクルが基板に付着すると、製造された半導体構造の性能が低下するおそれがあった。
しかしながら、特許文献3に開示の技術では、硫黄を物理的に除去しているため、除去された硫黄がプラズマ洗浄装置内の別の場所に再付着したり、プラズマ洗浄装置の下流側に配された配管に再付着したりするという問題があった。
本発明は、チャンバーの内面又はチャンバーに接続された配管の内面に付着している、硫黄を含有する付着物を、チャンバーを解体することなく除去することが可能な付着物除去方法及び成膜方法を提供することを課題とする。
[1] チャンバーの内面及び前記チャンバーに接続された配管の内面の少なくとも一方に付着している、硫黄を含有する付着物を、水素含有化合物ガスを含有するクリーニングガスと反応させることにより除去する付着物除去方法。
[3] 前記水素含有化合物ガスが、水素ガス、炭化水素ガス、及びアンモニアガスからなる群より選ばれる少なくとも1種である[1]又は[2]に記載の付着物除去方法。
[4] 前記水素含有化合物ガスが水素ガスである[1]又は[2]に記載の付着物除去方法。
前記パッシベーション工程を行った後に、前記チャンバーの内面及び前記チャンバーに接続された配管の内面の少なくとも一方に付着している、硫黄を含有する付着物を除去する付着物除去工程と、
を備え、
前記付着物除去工程を、[1]~[4]のいずれか一項に記載の付着物除去方法によって行う成膜方法。
[6] 前記硫黄含有化合物ガスが硫化水素ガスである[5]に記載の成膜方法。
本発明の第一実施形態は、付着物除去方法の実施形態であり、チャンバーの内面及びチャンバーに接続された配管の内面の少なくとも一方に付着している、硫黄を含有する付着物(以下、単に「付着物」と記すこともある)を、水素含有化合物ガスを含有するクリーニングガスと反応させることにより除去する方法である。なお、水素含有化合物ガスとクリーニングガスは硫黄原子を含有しない。
本発明の第二実施形態は、成膜方法の実施形態であり、硫黄含有化合物ガスを含有するパッシベーションガスを、基板が収容されたチャンバーに供給し、基板とパッシベーションガスとを反応させて、基板の表面にパッシベーション膜を成膜するパッシベーション工程と、パッシベーション工程を行った後に、チャンバーの内面及びチャンバーに接続された配管の内面の少なくとも一方に付着している、硫黄を含有する付着物を除去する付着物除去工程と、を備える方法である。そして、この付着物除去工程は、第一実施形態の付着物除去方法によって行われるものである。
パッシベーションガスにおける硫黄含有化合物ガスの含有比率は、パッシベーション膜の成膜に十分な量であれば特に限定されるものではないが、1体積%以上であることが好ましく、2体積%以上であることがより好ましく、10体積%以上であることがさらに好ましく、100体積%であることが特に好ましい。パッシベーションガスに含有される硫黄含有化合物ガス以外の成分は、特に限定されるものではないが、例えば、窒素ガス、アルゴンガス等の不活性ガスを挙げることができる。
(実施例1)
図1に示す成膜装置1を用いて、基板の表面にパッシベーション膜を成膜するパッシベーション工程と、硫黄を含有する付着物を除去する付着物除去工程とを繰り返し行った。成膜装置1は、パッシベーション工程や付着物除去工程を行うチャンバー10と、チャンバー10の内部の温度を調整する温度調整装置(図示せず)と、を有する。チャンバー10の内部には、試料20を支持するステージ11が備えられている。試料20としては、シリコン基板上に厚さ150nmのシリコン酸化膜が形成され、さらにその上に厚さ80nmのゲルマニウム膜が形成されたものを使用した。
付着物除去工程におけるチャンバー10内の温度を350℃、圧力を100Paとした点以外は、実施例1と同様にして、パッシベーション膜を成膜した試料20を100枚製造した。
(実施例3)
付着物除去工程におけるチャンバー10内の温度を20℃とした点以外は、実施例1と同様にして、パッシベーション膜を成膜した試料20を100枚製造した。
付着物除去工程におけるチャンバー10内の温度を800℃とした点以外は、実施例1と同様にして、パッシベーション膜を成膜した試料20を100枚製造した。
(実施例5)
付着物除去工程におけるチャンバー10内の圧力を20Paとした点以外は、実施例1と同様にして、パッシベーション膜を成膜した試料20を100枚製造した。
付着物除去工程におけるチャンバー10内の圧力を101kPaとした点以外は、実施例1と同様にして、パッシベーション膜を成膜した試料20を100枚製造した。
(実施例7)
付着物除去工程におけるクリーニングガス給気用配管13から供給するクリーニングガスをメタンガスとした点以外は、実施例1と同様にして、パッシベーション膜を成膜した試料20を100枚製造した。
付着物除去工程におけるクリーニングガス給気用配管13から供給するクリーニングガスをアンモニアガスとした点以外は、実施例1と同様にして、パッシベーション膜を成膜した試料20を100枚製造した。
(比較例1)
付着物除去工程を行わずパッシベーション工程のみを繰り返し行う点以外は、実施例1と同様にして、パッシベーション膜を成膜した試料20を100枚製造した。
このように、付着物除去工程を行うことにより、チャンバーを解体洗浄することなく、付着するパーティクルの個数を低く保ったままパッシベーション工程を繰り返し行うことができることが示された。
10・・・チャンバー
11・・・ステージ
12・・・パッシベーションガス給気用配管
13・・・クリーニングガス給気用配管
14・・・不活性ガス給気用配管
15・・・排気用配管
20・・・試料
Claims (6)
- チャンバーの内面及び前記チャンバーに接続された配管の内面の少なくとも一方に付着している、硫黄を含有する付着物を、水素含有化合物ガスを含有するクリーニングガスと反応させることにより除去する付着物除去方法。
- 温度20℃以上800℃以下、圧力20Pa以上101kPa以下の条件下で、前記クリーニングガスを前記付着物に接触させる請求項1に記載の付着物除去方法。
- 前記水素含有化合物ガスが、水素ガス、炭化水素ガス、及びアンモニアガスからなる群より選ばれる少なくとも1種である請求項1又は請求項2に記載の付着物除去方法。
- 前記水素含有化合物ガスが水素ガスである請求項1又は請求項2に記載の付着物除去方法。
- 硫黄含有化合物ガスを含有するパッシベーションガスを、基板が収容されたチャンバーに供給し、前記基板と前記パッシベーションガスとを反応させて、前記基板の表面にパッシベーション膜を成膜するパッシベーション工程と、
前記パッシベーション工程を行った後に、前記チャンバーの内面及び前記チャンバーに接続された配管の内面の少なくとも一方に付着している、硫黄を含有する付着物を除去する付着物除去工程と、
を備え、
前記付着物除去工程を、請求項1~4のいずれか一項に記載の付着物除去方法によって行う成膜方法。 - 前記硫黄含有化合物ガスが硫化水素ガスである請求項5に記載の成膜方法。
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