Structural Control Over Self-Assembled Crystals of π-Conjugated Poly(3,3‴-didodecyl-quaterthiophene) for Organic Field-Effect Transistor Applications
Abstract:Liquid-crystalline (LC) poly(3,3‴-didodecyl-quaterthiophene) (PQT-12) was investigated to optimize its side alkyl ordering and π-conjugated structure for high performance organic field-effect transistor (OFET) applications. Initially, low-crystal films spun-cast on OTS-treated SiO2 substrates were further crystallized via either thermal or solvent treatments. At temperatures (125–138 °C) driving a LC state of PQT-12, mobile chains were better migrated into preformed crystals. The resulting films showed highly crystal nanofibrils, in which π-conjugated polymer backbones (with an conjugated backbone spacing, d (010) of 3.80 Å) and the orientation of self-assembled side-chains were tilted with respect to the film surface, respectively. However, via melting or solvent exposure providing isotropic states, film crystallization generated less ordered crystals with randomly oriented side-chains, increasing d(010) up to 4.16 Å. As a result, the usage of LC characteristic allowed us to consistently achieve the desirable crystal structure of PQT-12 and to robustly obtain high field-effect mobility for FET applications.
Document Type: Research Article
Publication date: February 1, 2012
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