Effect of Electron Withdrawing Substituents of Thienylene-Vinylene-Thienylene-Based Conjugated Polymers on the Performance of Organic Field Effect Transistors.
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In this study, thienylene-vinylene-thienylene (TVT) derivatives with electron withdrawing groups (F, Cl, CN) in the 3- and 3'- positions was synthesized as a building block of semiconducting polymers for organic field effect transistors (OFETs). The properties of these three polymers were compared with the corresponding polymer without substitution in TVT (PNDI-TVT). The effect of substitutions was found to have an influence on the optical, electrochemical, morphological, and charge transporting properties of the resulting polymers. As a result, the maximum electron mobility of 0.16 cm2v-1s-1 was achieved in PNDI-FTVT (at 250 ℃), 0.033 cm2v-1s-1 was achieved in PNDI-ClTVT (at 250 ℃) and 0.0033 cm2v-1s-1 was achieved in PNDI-CNTVT (at 300 ℃), respectively, while that of PNDI-TVT was 0.95 cm2v-1s-1 (at 250 ℃).