Three donor-acceptor copolymers were synthesized by Stille coupling polymerization of benzodithiophene with bithienyl substituents donor and various acceptors. The benzodithiophene donor unit has 6 hexyl chains, which increased the solubility of the polymer and resulted in the synthesis of donor-acceptor polymers with relatively high molecular weights. The HOMO, LUMO and energy gap were calculated from cyclic voltammogram and UV-Vis spectroscopy. These synthesized donor-acceptor polymers are tested in bulk heterojunction solar cells with [6,6]-phenyl-C71 butyric acid methyl ester (PC71BM). The reported polymers had low HOMO levels of -5.6 eV, which resulted in high open-circuit voltages.

Synthesis donor-acceptor copolymers containing benzodithiophene with bithienyl substituents for bulk heterojunction solar cells

247th National Meeting (2014)

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