JP2021163775A - エッチング方法及びエッチング装置 - Google Patents
エッチング方法及びエッチング装置 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 44
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
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- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 description 14
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Abstract
【解決手段】エッチングガスに対して各々被エッチング性を有する第1の膜及び第2の膜が表面に形成された基板に、アミンガスを含む保護膜形成用ガスを供給し、前記エッチングガスを供給するときに前記第1の膜及び前記第2の膜のうち、前記第1の膜が選択的に保護されるように当該第1の膜を被覆する保護膜を形成する工程と、前記保護膜が形成された状態で、前記基板にエッチングガスを供給して前記第2の膜を選択的にエッチングする工程と、を備える。
【選択図】図3A
Description
前記保護膜が形成された状態で、前記基板にエッチングガスを供給して前記第2の膜を選択的にエッチングする工程と、
を備える。
本開示のエッチング方法の一実施形態に係る処理を以下に説明する。図1は、その処理が行われるウエハWの表面部の縦断側面図を示している。下層膜11上に酸化シリコン(SiOx)膜12、SiOCN膜13及びポリシリコン膜14が各々積層されており、各々がウエハWの表面に露出している。下層膜11と酸化シリコン膜12とにより凹部が形成されており、その凹部にポリシリコン膜14が埋込まれている。そして、ポリシリコン膜14の側壁と当該凹部13の側壁との間には、ポリシリコン膜14の側方を囲み、ポリシリコン膜14の側壁及び凹部の側壁に各々接するようにSiOCN膜13(即ちシリコン、酸素、窒素及び炭素により構成される膜)が設けられている。従って、横方向に見てポリシリコン膜14、SiOCN膜13、酸化シリコン膜12がこの順に隣り合うように形成されている。
第2の実施形態について、上記の第1の実施形態との差異点を中心に説明する。この第2の実施形態では既述したエッチングに対する保護膜の形成を、アミンガスとイソシアネートガスとをウエハWに供給することにより行う。詳しく述べると、保護膜形成用ガスであるアミンガス及びイソシアネートガスの供給により、ウエハWの表面において、これらのガスの反応生成物である尿素結合を有する化合物を形成する。後述の評価試験で示すようにアミンガス及びイソシアネートガスを各々一定量供給するにあたり、ウエハWの表面における膜毎に当該尿素結合を含む化合物の吸着量が異なる。つまり、アミンを用いた場合と同様に膜の種類に応じて形成される保護膜の厚さが異なる。なお、ここでいう保護膜の厚さが異なるとは、ウエハWの表面の2種類の膜のうち、一方の膜の表面には保護膜の形成がなされ、他方の膜の表面には保護膜が形成されない、ということも含む。第2の実施形態では、第1の実施形態と同様に、そのように厚さが異なる保護膜を利用して選択的にエッチングを行う。
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。
・評価試験1
評価試験1として、各々N(窒素)を含む分子であるNH3(アンモニア)、ブチルアミン、ヘキシルアミン、トリメチルアミンについて、Siを含む各種の分子に対する吸着エネルギーをシミュレーションにより測定した。具体的にはSi(シリコン)、SiC(炭化シリコン)、SiN(窒化シリコン)、SiO2CN(=SiOCN)、及びSiO(酸化シリコン)に対する吸着エネルギーを測定した。
評価試験2として、異なる種類のシリコン含有膜を表面に備えた基板に、ブチルアミンガスを供給した。具体的に上記のシリコン含有膜として、SiGe膜、α-Si膜、SiOC膜、SiN膜、ポリシリコン(Poly-Si)膜、SiO2(酸化シリコン)膜、SiOCN膜が各々形成された基板にガスを供給した。そして、ガスクロマトグラフ質量分析計(GC−MS)により、各膜におけるブチルアミンの吸着量を測定した。
評価試験3として、異なる種類のシリコン含有膜を表面に備えた基板に、アミンガスとイソシアネートガスとを供給した。そして、GC−MSにより、各膜における尿素結合を有する化合物の吸着量を測定した。上記の各シリコン含有膜は、評価試験2における各シリコン含有膜と同じである。
12 酸化シリコン膜
14 ポリシリコン膜
21 アミン
22 エッチングガス
23 保護膜
Claims (10)
- エッチングガスに対して各々被エッチング性を有する第1の膜及び第2の膜が表面に形成された基板に、アミンガスを含む保護膜形成用ガスを供給し、前記エッチングガスを供給するときに前記第1の膜及び前記第2の膜のうち、前記第1の膜が選択的に保護されるように当該第1の膜を被覆する保護膜を形成する工程と、
前記保護膜が形成された状態で、前記基板にエッチングガスを供給して前記第2の膜を選択的にエッチングする工程と、
を備えるエッチング方法。 - 前記第2の膜はシリコン含有膜である請求項1記載のエッチング方法。
- 前記第1の膜及び前記第2の膜は、互いに異なる種類のシリコン含有膜である請求項2記載のエッチング方法。
- 前記第1の膜は酸化シリコン膜であり、前記第2の膜はシリコン膜である請求項3記載のエッチング方法。
- 前記第1の膜及び第2の膜は、シリコンと酸素とを含有する膜である請求項3記載のエッチング方法。
- 前記第1の膜はSiOCN膜であり、前記第2の膜は酸化シリコン膜である請求項5記載のエッチング方法。
- 前記保護膜は前記アミンガスを構成するアミンである請求項1ないし6のいずれか一つに記載のエッチング方法。
- 前記保護膜形成用ガスはイソシアネートガスを含み、
前記保護膜は尿素結合を有する化合物により構成される請求項1ないし6のいずれか一つに記載のエッチング方法。 - 前記基板において前記第1の膜、多孔質膜、前記第2の膜がこの順に隣り合って設けられ、
前記保護膜を形成する工程は、前記多孔質膜の孔部に保護膜を形成して当該孔部を塞ぐ工程を含み、
前記第2の膜を選択的にエッチングする工程は、当該多孔質膜の孔部が塞がれた状態でエッチングガスを供給する工程を含む請求項1ないし8のいずれか一つに記載のエッチング方法。 - 処理容器と、
前記処理容器内に設けられ、当該処理容器内に供給されるエッチングガスに対して各々被エッチング性を有する第1の膜及び第2の膜が表面に形成された基板を載置するステージと、
前記処理容器内にアミンガスを含む保護膜形成用ガスを供給し、前記エッチングガスを供給するときに前記第1の膜及び前記第2の膜のうち、前記第1の膜が選択的に保護されるように当該第1の膜を被覆する保護膜を形成するための保護膜形成用ガス供給部と、
前記保護膜が形成された状態で前記第2の膜を選択的にエッチングするために、前記処理容器内に前記エッチングガスを供給するエッチングガス供給部と、
を備えるエッチング装置。
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