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Extreme ultraviolet (EUV) degradation of poly(olefin sulfone)s : towards applications as EUV photoresists

By Kirsten Lawrie, Idriss Blakey, James Blinco, Roel Gronheid, Kevin Jack, Ivan Pollentier, Michael J. Leeson, Todd R. Younkin and Andrew K. Whittaker


Poly(olefin sulfone)s, formed by the reaction of sulfur dioxide (SO2) and an olefin, are known to be highly susceptible to degradation by radiation and thus have been identified as candidate materials for chain scission-based extreme ultraviolet lithography (EUVL) resist materials. In order to investigate this further, the synthesis and characterisation of two poly(olefin sulfone)s namely poly(1-pentene sulfone) (PPS) and poly(2-methyl-1-pentene sulfone) (PMPS), was achieved and the two materials were evaluated for possible chain scission EUVL resist applications. It was found that both materials possess high sensitivities to EUV photons; however; the rates of outgassing were extremely high. The only observed degradation products were found to be SO2 and the respective olefin suggesting that depolymerisation takes place under irradiation in a vacuum environment. In addition to depolymerisation, a concurrent conversion of SO2 moieties to a sulfide phase was observed using XPS

Topics: 030300 MACROMOLECULAR AND MATERIALS CHEMISTRY, 030306 Synthesis of Materials, Poly(olefin sulfone); EUV; Photoresist
Publisher: Pergamon
Year: 2011
DOI identifier: 10.1016/j.radphyschem.2010.07.038
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