Organic field-effect transistors (OFETs) are advancing rapidly in terms of their applications in low-cost large-area thin film transistors. However, PFETs with high carrier mobility and long-time stability are usually achieved in low-humidity and inert atmosphere. Therefore, to design new polymers for high-mobility PFETs with ambient-stability is still of great challenge. On the other hand, the structure-property relationship is important for designing new organic materials for optoelectronics. Although several design strategies and even computational methods have been proposed for small molecular OFETs, rational design strategy for PFETs are seldom reported.Herein, we develop isoindigo-based copolymers for PFETs to investigate their structure-property relationship. Owing to the donor-acceptor interaction and the spatial steric hindrance caused by the branched alkyl chains, we envision that the small units dock into the cavity formed by the isoindigo cores and branched alkyl chains. We systematically compare FET device performances, polymer packings and film morphologies of the polymers, and find that this strategy is efficient to obtain high-performance FETs. Polymers with C2h-symmetric donors exhibit systematically higher field-effect mobility than those with C2v-symmetric ones.

Isoindigo-based copolymers for field-effect transistors: The structure-property relationship

246th National Meeting (2013)

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