苝四羧酸酯基聚合物受体光伏材料的合成与光电性质

Perylene tetracarboxylic tetraester as weak acceptor unit was copolymerized with thieno[3,2-b]thiophene and 2,2'-bithiophene respectively to obtain two new donor-acceptor (D-A) type polymeric acceptors through Stille polycondensations. The thermal stablity, optical and electrochemical properties of both polymer acceptors were investigated by TGA, UV-Vis absorption spectra and cyclic voltammograms (CV) measurements. The polymers displayed good solubility and thermal satbility. Both polymers displayed narrow optical band gap and higher-lying LUMO energy leves compared to those of fullerene acceptors, as well as well-matched HOMO and LUMO energy levels with those of P3HT as donor material. When exploited as the acceptor combined with the donor of P3HT in all-polymer solar cell with a typical device structure of ITO/PEDOT:PSS/P3HT: Polymer/Ca/Al, P1 and P2 achieved power conversion efficiency of 0.24% and 0.62% respectively.