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Tao Xu, Luyao Lu, Tianyue Zheng, Jodi M. Szarko, Alexander Schneider, Lin X. Chen and Luping Yu Tuning the Polarizability in Donor Polymers with a Thiophenesaccharin Unit for Organic Photovoltaic Applications Advanced Functional Materials 24

Version of Record online: 18 FEB 2014 | DOI: 10.1002/adfm.201303688

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Low bandgap copolymers incorporating an artificial sweetener derivative (TID) are synthesized. They exhibit a diminished power-conversion efficiency (PCE) with a large local dipole moment change between ground and excited states Δμge, indicating that the linear correlation between Δμge and PCE does not extend further to a larger internal dipolar change region. The strongly electron-withdrawing sulfonyl group is detrimental to charge separation in copolymer TID.

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