A new easily accessible, high molecular weight, alternating dithieno-diketopyrrolopyrrolophenylene copolymer provides high electron and hole mobilities exceeding 0.02 cm2 V−1 s−1 in FETs and AM1.5 power conversion efficiencies of 4.6% and 5.5% in solar cells when combined with PCBM and PCBM. The performance of the solar cells strongly depends on the use of a processing agent.
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