Poly［2

6-(4

4-bis-(2-ethylhexyl)-4H-cyclopenta［2

1-b；3

4-b］dithiophene)-alt-4

7-(2

1

3- benzothiadiazole)］ (PCPDTBT) is a new kind of low band-gap polymers for applications in organic photovoltaic devices.However

PCPDTBT was studied as the donor to form the photoactive composites only with organic acceptors (fullerene derivatives) so far.In this article

PCPDTBT was synthesized

and its chemical structure

thermal stability and energy levels were identified and characterized by NMR

GPC

TGA

and CV

respectively.Furthermore

the composites of PCPDTBT with two electron acceptors of 1-(3-methoxycarbonylpropyl)-1-phenyl［6

6］C61 (PCBM) and ZnO nanoparticles were prepared by solutionblending.Both composites showed fluorescence quenching

indicating that the photo-induced charge transfer occurred due to the energy level offset between the donor PCPDTBT and the acceptor.Nevertheless

from the SEM images of the two composites

it was disclosed that PCBM molecules were well dispersed all over the PCPDTBT- PCBM composite whereas ZnO nanoparticles aggregated to some extent in the PCPDTBT-ZnO composite

leading to a more effective photo-induced charge transfer between PCPDTBT and PCBM.