Third generation semiconducting polymers rely on the unique approach of pairing electron donors with electron acceptors in a nano hybrid system.  Regioregular poly(3-alkylthiophene)s have emerged as excellent donor material candidates for organic photovoltaics.  Introducing fused rings, and alternating electron-rich with electron-poor monomers can improve charge transfer capabilities.  This study details the copolymerization of fused ring systems of electron rich materials such as DTP with thiophenes bearing various ethynyl side chains.  Field effect mobility and conductivity was measured and optimized.  Film quality was examined using atomic force microscopy (AFM) and the films were also investigated using grazing incidence x-ray scattering (GIXS).  The polymers' optical band gaps were calculated using UV-Vis absorption and showed broad absorption of the visible range.  Cyclic voltammetry show reduction of the band gaps.  The polymerization methods were optimized to increase polymer yields and monomer synthetic steps were optimized as well.

Dithienopyrrole-thiophene derivative copolymers for organic electronic applications

243rd National Meeting (2012)

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