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Solar cells based on a new conjugated donor polymer with alternating quaterthiophene and diketo pyrrolo-pyrrole units in combination with C60 and C70 PCBM acceptors afford high external quantum efficiencies over a broad spectral range into the near-infrared. The cells provide power conversion efficiencies of up to 4.0% under simulated AM1.5G solar light conditions.
Wienk et al. (Mon,) studied this question.