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Polymethacrylate with semiconducting side chains (P1), synthesized by free radical polymerization, was used as a donor material for polymer solar cells. P1 is of high molecular weight (Mn = 82 kg mol−1), good thermal stability, narrow band gap (1.87 eV), and low‐lying HOMO energy level (−5.24 eV). P1 possesses not only the good film‐forming ability of polymers but also the high purity of small organic...
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