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An electron‐deficient building block BDOPV is developed to construct a new donor–acceptor conjugated polymer BDOPV‐2T for high‐performance n‐type and oxygen‐doped ambipolar polymer field‐effect transistors. A high electron mobility up to 1.74 cm2 V−1 s−1 is demonstrated under ambient conditions. Furthermore, the oxygen‐doping effect and possible mechanism are discussed.
Four polymers that contain alkyl chains branched at different positions on the polymer backbone are prepared. A polymer with 4‐decyltetradecyl chains gives an impressive mobility of 3.62 cm2 V−1 s−1. This may arise from tighter polymer packing as well as stacking conformation change of the polymer backbone induced by the branching of the alkyl chains.
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