JP6460947B2 - 基板処理方法、基板処理装置および記憶媒体 - Google Patents
基板処理方法、基板処理装置および記憶媒体 Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims description 100
- 238000003672 processing method Methods 0.000 title claims description 12
- 238000003860 storage Methods 0.000 title claims description 12
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 148
- 239000007788 liquid Substances 0.000 claims description 58
- 230000002093 peripheral effect Effects 0.000 claims description 41
- 229910000577 Silicon-germanium Inorganic materials 0.000 claims description 40
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 34
- 229910017604 nitric acid Inorganic materials 0.000 claims description 30
- 238000005530 etching Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 29
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 16
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 9
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 9
- 229920005591 polysilicon Polymers 0.000 claims description 9
- 239000012459 cleaning agent Substances 0.000 claims description 8
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims description 3
- 239000010408 film Substances 0.000 description 104
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- 238000010306 acid treatment Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 7
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010926 purge Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000001039 wet etching Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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Description
その後、ウエハWが鉛直軸線周りに回転させられる。ウエハWは、後述する一連の工程が終了するまでの間、継続的に回転させられる。
次に、図6に示すように、回転しているウエハWの表面(デバイス形成面)のベベル部WBを含むウエハWの周縁部分内の位置P1,P2に、前処理ノズル43,43’からSC−1が供給される。SC−1は、ウエハWの端縁WE(Apexと呼ばれる部分)まで回り込む。このため位置P1,P2との間の領域Aの全体がSC−1液(PL)により覆われる。SC−1液により、ウエハWのエッチング対象部位である領域Aに付着している有機物が除去される。最終的に、SC−1は遠心力によりウエハWから離脱して飛散する。なお、以下の液がウエハWに供給される各工程において、液(フッ硝酸およびDIW)の動きは上記のSC−1の動きと同じであるので、重複説明は省略する。
前処理ノズル43,43’からのSC−1液の吐出を停止した後、回転しているウエハW上の位置P1,P2にリンスノズル42,42’からDIWが供給される。これによりウエハ表裏面の周縁部分に残留していたSC−1液および反応生成物が洗い流される。
リンスノズル42,42’からのDIWの吐出を停止した後、回転しているウエハW上の位置P1,P2に、薬液ノズル41、41’から予め定められた流量でフッ酸リッチのフッ硝酸が供給される。
まず、SiGe膜103中のSiがフッ硝酸中に含まれる硝酸により下記反応式に従い酸化され酸化シリコンとなり、
Si + 2HNO3 → SiO2 + 2HNO2
次いで、酸化シリコンがフッ硝酸中に含まれるフッ酸により下記反応式に従い溶解する。
SiO2 + 6HF → H2SiF6 + 2H2O
薬液ノズル41,41’からのフッ硝酸の吐出を停止した後、回転しているウエハW上の位置P1,P2にリンスノズル42,42’からDIWが供給される。これによりウエハ表裏面の周縁部分に残留していたフッ硝酸および反応生成物が洗い流される。
リンスノズル42,42’からのDIWの吐出を停止した後、回転しているウエハW上の位置P1,P2に、薬液ノズル41,41’から予め定められた流量で硝酸リッチのフッ硝酸が供給される。硝酸リッチのフッ硝酸は、比較的低いエッチングレートでSiGe膜103をエッチングする。この第2フッ硝酸処理工程は、SiGe膜103のSiリッチの下層(第1層103a)の全てを除去するために必要な時間だけ行われる。この必要な時間は、予め実験により求めておくことができる。一例として、第1層の膜厚は70nmであり、このときの第2フッ硝酸処理工程の処理時間は約120秒である。
薬液ノズル41,41’からのフッ硝酸の吐出を停止した後、回転しているウエハW上の位置P1,P2にリンスノズル42,42’からDIWが供給される。これによりウエハ表裏面の周縁部分に残留していたフッ硝酸および反応生成物が洗い流される。
リンスノズル42、42’からのDIWの吐出を停止した後、好ましくはウエハWの回転速度を増し、ウエハW上に残留しているDIWを遠心力により振り切る振り切り乾燥が行われる。振り切り乾燥工程の前にウエハW上に残留しているDIWを図示しない溶剤ノズルから供給されたIPA(イソプロピルアルコール)等の乾燥用有機溶剤と置換してもよいし、振り切り乾燥工程を行う際に図示しないガスノズルから供給された窒素ガスまたはドライエア等の乾燥ガスを処理対象部位のあたりに吹き付けてもよい。
101 シリコンウエハ
102 SiO2膜
103 SiGe膜(除去対象膜)
103b,103c SiGe膜の上層
103a SiGe膜の下層
4 制御装置(制御部)
30 基板保持機構
40 処理液供給部
Claims (8)
- 基板の周縁部分を処理する基板処理方法であって、
下地膜が形成され、前記下地膜の上に、シリコンゲルマニウム、アモルファスシリコン、及びポリシリコンのうちいずれか1つの物質からなる除去対象膜が形成された基板を保持して回転させる基板回転工程と、
回転している前記基板の周縁部分に、第1混合比でフッ酸及び硝酸を含有する第1処理液を供給して前記除去対象膜をエッチングする第1処理工程と、
前記基板に前記第1処理液を供給した後に、回転している前記基板の周縁部分に第1処理液よりもフッ酸の含有比が低く硝酸の含有比が高い第2混合比でフッ酸及び硝酸を含有する第2処理液を供給して前記除去対象膜をエッチングする第2処理工程と、
を備えることを特徴とする、基板処理方法。 - 前記第1処理工程の前に、回転している前記基板の周縁部分に有機物洗浄剤を供給する前処理工程をさらに備えることを特徴とする、請求項1に記載の基板処理方法。
- 前記除去対象膜は、上層と、前記上層よりも下にあり前記上層よりも薄い下層を含み、
前記第1処理工程は、前記上層がエッチングされる時間だけ実行され、
前記第2処理工程は、前記下層がエッチングされる時間だけ実行される
ことを特徴とする、請求項1または2に記載の基板処理方法。 - 前記第1処理工程の終了後であって前記第2処理工程の開始前に、DIWを用いて前記基板のリンスを行うリンス工程をさらに有することを特徴とする、請求項3に記載の基板処理方法。
- 前記下地膜はSiO2からなることを特徴とする、請求項1〜4のいずれか一項に記載の基板処理方法。
- 基板処理装置の制御装置をなすコンピュータにより実行されたときに、前記制御装置が前記基板処理装置を制御して請求項1から5のうちのいずれか一項に記載の基板処理方法を実行させるプログラムが格納された記憶媒体。
- 下地膜が形成され、前記下地膜の上に、シリコンゲルマニウム、アモルファスシリコン、及びポリシリコンのうちいずれか1つの物質からなる除去対象膜が形成された基板を処理するための基板処理装置であって、
基板を保持して回転させる基板保持機構と、
前記基板保持機構により保持された基板の周縁部分にフッ酸及び硝酸を含有する処理液を供給する処理液供給部と、
前記基板保持機構および前記処理液供給部を制御する制御部と、を備え、
前記処理液供給部は、第1混合比でフッ酸及び硝酸を含有する第1処理液を供給することができ、かつ、第1処理液よりもフッ酸の含有比が低く硝酸の含有比が高い第2混合比でフッ酸及び硝酸を含有する第2処理液を供給することができるように構成され、
前記制御部は、前記基板保持機構を制御して前記基板を回転させ、かつ、前記処理液供給部を制御して、回転している前記基板の周縁部分に前記第1処理液を供給させ、その後、回転している前記基板の周縁部分に前記第2処理液を供給させることを特徴とする基板処理装置。 - 前記処理液供給部は、前記基板保持機構により保持された基板の周縁部分に有機物洗浄剤を供給することができるようにも構成され、前記制御部は、前記第1処理液を供給する前に、前記処理液供給部に、回転している前記基板の周縁部分に前記有機物洗浄剤を供給させることを特徴とする、請求項7記載の基板処理装置。
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