21 March 2016 EB and EUV lithography using inedible cellulose-based biomass resist material
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The validity of our approach of inedible cellulose-based resist material derived from woody biomass has been confirmed experimentally for the use of pure water in organic solvent-free water spin-coating and tetramethylammonium hydroxide(TMAH)-free water-developable techniques of eco-conscious electron beam (EB) and extreme-ultraviolet (EUV) lithography. The water developable, non-chemically amplified, high sensitive, and negative tone resist material in EB and EUV lithography was developed for environmental affair, safety, easiness of handling, and health of the working people. The inedible cellulose-based biomass resist material was developed by replacing the hydroxyl groups in the beta-linked disaccharides with EB and EUV sensitive groups. The 50-100 nm line and space width, and little footing profiles of cellulose-based biomass resist material on hardmask and layer were resolved at the doses of 10-30 μC/cm2. The eco-conscious lithography techniques was referred to as green EB and EUV lithography using inedible cellulose-based biomass resist material.
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Satoshi Takei, Satoshi Takei, Makoto Hanabata, Makoto Hanabata, Akihiro Oshima, Akihiro Oshima, Miki Kashiwakura, Miki Kashiwakura, Takahiro Kozawa, Takahiro Kozawa, Seiichi Tagawa, Seiichi Tagawa, "EB and EUV lithography using inedible cellulose-based biomass resist material", Proc. SPIE 9779, Advances in Patterning Materials and Processes XXXIII, 977929 (21 March 2016); doi: 10.1117/12.2217481; https://doi.org/10.1117/12.2217481

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