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Polyhedral Oligomeric Silsesquioxane Containing Copolymers for Negative‐Type Photoresists
Author(s) -
Lin HoMay,
Wu ShiYin,
Huang PeiYuan,
Huang ChihFeng,
Kuo ShiaoWei,
Chang FengChih
Publication year - 2006
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200600363
Subject(s) - photopolymer , copolymer , silsesquioxane , glycidyl methacrylate , materials science , methacrylate , polymer chemistry , hydrogen silsesquioxane , photoresist , siloxane , hydrogen bond , resist , photochemistry , polymerization , polymer , chemistry , molecule , organic chemistry , nanotechnology , composite material , electron beam lithography , layer (electronics)
Summary: A series of methacrylate copolymers containing polyhedral oligomeric silsesquioxane (POSS) was synthesized from the free radical copolymerization of methacrylic acid, methyl methacrylate, and isobutyl propylmethacryl polyhedral oligosilsesquioxanes, and then were modified with glycidyl methacrylate to serve as negative‐type photoresists. The UV/Vis spectroscopy reveals that the incorporation of POSS moiety into the copolymer results in a slight decrease in transparency from 99 to 92.5% (at wavelength = 365 nm). The photosensitivity in terms of resist sensitivity ( D n 0.5 ), contrast ( γ ), and photopolymerization rate are significantly increased with increase in the POSS content. In addition, the induction time is reduced from 0.520 to 0.515 min after incorporating the POSS unit based on photo‐DSC analyses. These observed results can be rationalized as due to hydrogen bonding interactions between siloxane and hydroxyl groups in copolymers which tend to attract the methacrylate double bonds surrounding POSS units to crosslink, thereby enhancing the photopolymerization rate and sensitivity. We further evaluate the lithographic property of a photoresist under a collimated exposure.Compact double bonds zone induced via hydrogen bonding.