| 초록 |
Recently, various approaches to extend light absorption range have been studied for increasing the power conversion efficiency of polymer solar cells (PSCs). It is one of the efficient strategies to synthesize random copolymers composed of two different chromophores which have complementarily different light absorption range. In this work, we synthesized conjugated random copolymers (PDPPRPD3T) composed of rearranged Pechmann dye and diketopyrrolopyrrole as co-electron acceptor units in donor-acceptor type copolymer. The light absorption ranges of these units are completely complementary though they have very similar chemical structure. The absorption range of PDPPRPD3T is broader than the corresponding two homopolymers, while the HOMO energy level of PDPPRPD3T (‒5.45 eV) is lower than that of PDPP3T (‒5.28 eV), which induces high open-circuit voltage. These excellent optoelectrical properties make PDPPRPD3T a promising candidate for active layer material of high-performance PSCs. |
