| 초록 |
Extension of light absorption of the conjugated polymer is one of the most important factors for enhancement of power conversion efficiency of polymer solar cells (PSCs) because the limited absorption of most conjugated polymers leads to lower current density. An effective approach to extend light absorption is synthesis of copolymers composed of at least two different chromophores with complementary absorption range. To broaden light absorption range and thus enhance the efficiency of PSCs, we synthesized random copolymers consisting of DPP and isoindigo as co-electron deficient units in D-A type copolymer. The random copolymers exhibited both broad light absorption and low-lying HOMO levels. Furthermore, predominant face-on orientation of random copolymers on substrate is beneficial for charge transport in device. Combination of excellent optoelectrical properties and favorable molecular orientation renders the random copolymer a promising candidate for active layer material in PSCs. |
