<EM>Nanogroove Alignment of Chlorine Substituted Benzo[c]-[2,1,3]thiadiazole-based Semiconducting Copolymers with Controlled Regioregularity</EM>
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초록
내용
It's well known that introduction of electron withdrawing groups at the acceptor unit of a donor-acceptor type conjugated polymer can be an effective way to modify the molecular packing structure and charge transport properties of the polymer thin film. However, understanding on the effect of halogen substitution into the polymers based on benzo[2,1,3]thiadiazole (BT, acceptor moiety) and 4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b’]dithiophene (CDT, donor moiety) on the polymer’s packing structure has not been investigated. In this work, we show that depending on the regioregularity of the chlorinated BT-CDT copolymer the nanogroove-induced packing of the polymer chains varies greatly, leading to 10 times higher charge carrier mobility of the well-aligned polymer film compared to the poorly aligned one. These results represent the importance of controlling regioregularity of halogenated D-A copolymers to achieve highly-ordered polymer films with high charge carrier mobility.