24 July 2002 Fluoropolymer resists for 157-nm lithography
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Fluoropolymers are key materials for single-layer resists in 157-nm lithography. We investigated main-chain fluorinated polymers and found that the incorporation of fluorine atoms into polymer backbones such as that in tetrafluoroethylene and monocyclic monomers reduced their absorption coefficients to less than 1 micrometers -1 at 157 nm, while side-chain fluorinated polymers had absorption coefficients of 2 to 3 micrometers -1. The main-chain fluorinated polymers also showed good solubility in a standard alkaline developer and their dry-etching resistance was comparable to that of a ArF resist. Prototype positive-tone resists had good sensitivities of less than 10 mJ/cm2, and they exhibited fine imaging resolution with 80-nm dense patterns. The resists can be used to obtain 300-nm-thick films.
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Minoru Toriumi, Minoru Toriumi, Naomi Shida, Naomi Shida, Hiroyuki Watanabe, Hiroyuki Watanabe, Tamio Yamazaki, Tamio Yamazaki, Seiichi Ishikawa, Seiichi Ishikawa, Toshiro Itani, Toshiro Itani, "Fluoropolymer resists for 157-nm lithography", Proc. SPIE 4690, Advances in Resist Technology and Processing XIX, (24 July 2002); doi: 10.1117/12.474218; https://doi.org/10.1117/12.474218

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