Highly Efficient 2D-Conjugated Benzodithiophene-Based Photovoltaic Polymer with Linear Alkylthio Side Chain

Tremendous efforts have been devoted to designing, synthesizing and optimizing photovoltaic polymers with superior photovoltaic properties, such as suitable molecular energy levels, broad absorption band, high hole mobility, and so on. Considering that the branched alkyls have positive influence in keeping good solubility but adverse effect on the structural order and thereby charge transport properties, the nonconjugated side groups in photovoltaic polymers must be carefully selected. The dropped value should be ascribed to the degradation of conventional device architecture. This certification showed our results are reliable. Clearly, PBDT-TS1 is one of the outstanding photovoltaic polymers reported to date. More importantly, due to the high starting point acquired in simple conventional device, PCEs of 10% or even higher would be realized in single-junction PSC by integrating more efficient device structures, such as inverted, plasmonic, or microcavity architectures.