Abstract A series of novel copolymers derived from phenylene-bisethynlene and 2-pyran-4-ylidene-malononitile (PM) were synthesized successfully through palladium-catalyed Heck-cross coupling reaction. All of the copolymers exhibited excellent solubility in common organic solvents. The PL spectra of copolymer P2:TiO2 bulk-heterojunction decreased with increasing amount of Ti (OC3H7)4 compared to that of a pristine copolymer film. This indicates the existence of strong photoinduced electronic interactions between the polymers P2 and TiO2. Electrochemical and photophysical studies reveal band gap of these copolymers are range from 1.7-1.85ev, which indicated that they may be promising candidates for solar cells.

Key words: copolymer, solar cell materials, photoluminscence quenching, synthesis