| 초록 |
A series of semi-crystalline poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PPDT2FBT) polymers with different number-average molecular weights (Mn = 12; 24; and 40 kg/mol) were synthesized, and their photovoltaic properties as electron donors for all-polymer solar cells (all-PSCs) with poly[[N,N′bis(2octyldodecyl)-napthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′ (2,2′-bithiophene)] (P(NDI2OD-T2)) acceptor were studied. The optimized all-PSCs based on highest Mn PPDT2FBTH/P(NDI2OD-T2) showed substantially higher hole and electron mobilities, promoted a strong “face-on” geometry in the blend film, large crystalline domain, and facilitated molecularly intermixed phases with P(NDI2OD-T2) than those of lower Mn, leading to a performance exceeding 5%. |
