Three new donor-acceptor copolymers P1  , P2  , and P3  were synthesized with benzodithiophene with bithienyl substituents as the donor and 5,6-difluorobenzo[c][1,2,5]thiadiazole, 4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole, and 5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole as the acceptors, respectively. The synthesized donor-acceptor polymers were tested in bulk heterojunction solar cells with [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) acceptor. The insertion of thiophene spacer between the donor and the acceptor broadened the absorption of the polymers P2  and P3  and resulted in a red shift of ~ 30 nm as compared to that of the polymer P1  . However, the inclusion of fluorine atoms on the polymer had detrimental effects on the photovoltaic properties of the polymers. The polymers were tested in Bulk Heterojunction solar cells. Polymer P2  gave a PCE of 3.52% with PC71BM in which the active layer was prepared in chloroform with 3% v/v 1,8-diiodooctane (DIO) additive.

Donor-acceptor copolymers containig benzodithiophenes with bithienyl substituents to achieve high open circuit voltage in bulk heterojunction solar cells

247th National Meeting (2014)

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