A π-extended low bandgap polymer (PiITVT) consisting of isoindigo and thienylvinylene is synthesized and used as an active layer material for polymer solar cells. PiITVT-based polymer solar cells exhibited a high power conversion efficiency of 7.09%, which is higher than that of PiI2T (5.55%), because of the better coplanar structure of the TVT unit than the 2T unit.
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Jung et al. (2013) studied this question.
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