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Four polymers based on perylenediimide co-polymerized with thiophene, bithiophene, selenophone and thieno[3,2-b]thiophene were investigated as the acceptor materials in all-polymer solar cells. Two different donor polymers, poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b′]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene)-2-carboxylate-2,6-diyl](PTB7-Th) and poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3′′′-di(2-dodecyltetradecyl)-2,2′;5′,2″;5″,2′′′-quaterthiophen-5,5′′′-diyl)](Pff BT4T-2DT), with suitably complementary absorption spectra and energy levels were applied and examined. Among all different donor-acceptor pairs studied here, the combination of PTB7-Th:poly[N,N′-bis(1-hexylheptyl)-3,4,9,10-perylenediimide-1,6/1,7-diyl-alt-2,5-thiophene](PDI-Th) exhibited the best power conversion efficiency(PCE) of 5.13%, with open-circuit voltage(V_(oc)) = 0.79 V, short-circuit current density(J_(sc)) = 12.35 mA·cm~(-2) and fill-factor(FF) = 0.52. The polymer of PDI-Th acceptor used here had a regio-irregular backbone, conveniently prepared from a mixture of 1,6- and 1,7-dibromo-PDI. It is also noteworthy that neither additive nor posttreatment is required for obtaining such a cell performance.
Four polymers based on perylenediimide co-polymerized with thiophene, bithiophene, selenophone and thieno [3,2-b] thiophene were investigated as the acceptor materials in all-polymer solar cells. Two different donor polymers, poly [4,8- bis 5- (2-ethylhexyl) thiophen-2-yl) benzo [1,2-b; 4,5-b ’] dithiophene-2,6-diyl- [3,4-b] thiophene) -2-carboxylate-2,6-diyl] (PTB7-Th) and poly [(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl) 5 ’, 2’ ’- quaterthiophen-5,5’ ’- diyl]] (Pff BT4T-2DT), with appropriate complementary absorption spectra and energy levels were applied and examined. Among all different donor-acceptor pairs studied here, the combination of PTB7-Th: poly [N, N’-bis With the best power conversion efficiency (PCE) of 5.13% with open-circuit voltage (PDI-Th) (V_ (oc)) = 0.79 V, short-circuit current density (J_ (sc)) = 12.35 mA · Cm -2 and fill-factor (FF) = 0.52 The polymer of PDI-Th acceptor used here had a regio-irregular backbone, conveniently prepared from a mixture of 1,6- and 1,7-dibromo- PDI. It is also noteworthy that that additive plus posttreatment is required for such such cell performance.