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Left. Structures of the monomeric units of the polymers P3HT, PCDTBT, PTB7 and the fullerene derivatives C60-PCBM and C70-PCBM. Right. Current-voltage (IV) characteristics of bulk heterojunction solar cells prepared from the polymer:fullerene composites shown on the left. Numbers state the achieved power conversion efficiency (PCE). The insert schematically illustrates the device structure. Details are provided in the Supporting Information.
