19 March 2018 Theoretical modeling of PEB procedure on EUV resist using FDM formulation
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Semiconductor manufacturing industry has reduced the size of wafer for enhanced productivity and performance, and Extreme Ultraviolet (EUV) light source is considered as a promising solution for downsizing. A series of EUV lithography procedures contain complex photo-chemical reaction on photoresist, and it causes technical difficulties on constructing theoretical framework which facilitates rigorous investigation of underlying mechanism. Thus, we formulated finite difference method (FDM) model of post exposure bake (PEB) process on positive chemically amplified resist (CAR), and it involved acid diffusion coupled-deprotection reaction. The model is based on Fick’s second law and first-order chemical reaction rate law for diffusion and deprotection, respectively. Two kinetic parameters, diffusion coefficient of acid and rate constant of deprotection, which were obtained by experiment and atomic scale simulation were applied to the model. As a result, we obtained time evolutional protecting ratio of each functional group in resist monomer which can be used to predict resulting polymer morphology after overall chemical reactions. This achievement will be the cornerstone of multiscale modeling which provides fundamental understanding on important factors for EUV performance and rational design of the next-generation photoresist.
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Muyoung Kim, Muyoung Kim, Junghwan Moon, Junghwan Moon, Joonmyung Choi, Joonmyung Choi, Byunghoon Lee, Byunghoon Lee, Changyoung Jeong, Changyoung Jeong, Heebom Kim, Heebom Kim, Maenghyo Cho, Maenghyo Cho, } "Theoretical modeling of PEB procedure on EUV resist using FDM formulation", Proc. SPIE 10583, Extreme Ultraviolet (EUV) Lithography IX, 1058323 (19 March 2018); doi: 10.1117/12.2296494; https://doi.org/10.1117/12.2296494

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