A novel D-A1-D-A2-type polymer that exhibits a small bandgap of 1.43 eV yet still yields polymer solar cells with a high open-circuit voltage (VOC) of 0.81 V and power conversion efficiencies of up to 8.63% is reported. Comparable efficiencies can be achieved even when the active layer is processed in air or after it is thermally annealed at 150 °C.
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Ma et al. (2015) studied this question.
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