| 초록 |
Random copolymers composed of one electron donating unit and two electron accepting units have been recognized as a promising donor material in OPV, because the two electron accepting units may show synergetic effect on the OPV performance. Thiophene-capped (T) and pyridine-capped (Py) diketopyrrolopyrrole (DPP) have recently attracted great interest as an electron accepting unit for conjugated semi-conducting polymers: A low bandgap polymer (pTDPP2T) composed of TDPP and bithiophene (2T) shows high short circuit current, while the polymer composed of PyDPP and 2T exhibits high open circuit voltage (VOC) . In this work, a new series of conjugated random copolymer was synthesized by copolymerization of 2T as an electron donating unit with TDPP and PyDPP as co-electron accepting unit. The VOC of the random copolymer can systematically be controlled by varying the ratio of PyDPP to TDPP. Consequently, the solar cell device based on the random copolymer shows a promising PCE of 7.1%. |
