A polythiophene derivative with octyloxyl triphenylamine-vinylene conjugated side chain: Synthesis and its applications in field-effect transistor and polymer solar cell

A new polythiophene derivative with octyloxyl triphenylamine-vinylene (OTPAV) conjugated side chain, OTPAV-PT, was synthesized according to the Stille coupling method, and characterized by H-1 NMR, elemental analysis, GPC, TGA, UV-vis absorption spectroscopy, photoluminescence spectroscopy, and cyclic voltammetry. The polymer possesses excellent solubility in common organic solvents and good thermal stability with 5% weight loss temperature of 413 degrees C. The weight-average molecular weight of OTPAV-PT was 1.04 x 10(4) with the polydispersity index of 1.45. Polymer solar cell with the configuration of ITO/PEDOT: PSS/OTPAV-PT: PCBM/Al was fabricated, and the power conversion efficiency of the device was 0.21% under the illumination of AM1.5, 100mW/cm(2). The field effect hole mobility of the polymer reached 1.6 x 10(-4) cm(2) V-1 S-1. (C) 2008 Elsevier B.V. All rights reserved.