Abstract:

A series of novel p-/n- 3-alkylthiophene copolymers were synthesized by Heck reaction: P3HT-OXD, P3OT-OXD, P3HT-Py and P3OT-Py. They were characterized by NMR, gel permeation chromatography(GPC). The optical properties were investigated using Uv-visspectroscopy and electrochemical properties were measured by cyclic voltammetry. It was found that the ionization potential ( Ip) and band gap(Eg) of copolymers were reduced with an increase of the length of alkyl chain. The band gap of P3HT-OXD, P3OT-OXD , P3HT-Py and P3OT-Py was at 2.80eV, 2.69eV, 3.14eV and 2.95eV. Electron affinity(Ea) of polythiophene containing 1,3,4-oxadiazole in main chain was comparatively high, which will be avail to enhance electron-transporting effect and improve the balanced rates for electron and hole injection