A D–A polymer, PSeTPTI, was developed by copolymerizing a pentacyclic acceptor unit TPTI with a selenophene unit. PSeTPTI possesses a narrow optical bandgap, a low-lying HOMO energy level, and a high hole mobility of 0.26 cm2 V−1 s−1. PSeTPTI/PC71BM solar cells demonstrate a PCE of 6.04%, which is the highest efficiency for the conjugated copolymers using selenophene as the donor unit.
J. Cao, S. Chen, Z. Qi, Z. Xiao, J. Wang and L. Ding, RSC Adv., 2014, 4, 5085 DOI: 10.1039/C3RA47098A
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