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    Revealing the Role of Polaron Distribution on the Performance of n-Type Organic Electrochemical Transistors

    Year: 2022

    Journal: Chem. Mat., Volume 34, JAN 25, page 864–872

    Authors: Shi, Junwei; Li, Peiyun; Deng, Xin-Yu; Xu, Jingcao; Huang, Zhen; Lei, Yuqiu; Wang, Yunfei; Wang, Jie-Yu; Gu, Xiaodan; Lei, Ting

    Organizations: National Natural Science Foundation of China [92156019, 22075001]; Open Fund of the State Key Laboratory of Luminescent Materials and Devices, South China University of Technology [2021-skllmd-02]; China Postdoctoral Science Foundation [2020M680190]; Boya Postdoctoral Fellowship of Peking University

    Organic electrochemical transistors (OECTs) have shown great potential in bioelectronics and neuromorphic computing. However, the low performance of n-type OECTs impedes the construction of complementary-type circuits for low-power-consumption logic circuits and high-performance sensing. Compared with their p-type counterparts, the low electron mobility of n-type OECT materials is the primary challenge, leading to low mu C* and slow response speed. Nevertheless, no successful method has been reported to address the issue. Here, we find that the charge carrier mobility of n-type OECTs can be significantly enhanced by redistributing the polarons on the polymer backbone. As a result, 1 order of magnitude higher electron mobility is achieved in a new polymer, P(gPzDPP-CT2), with a simultaneously enhanced mu C* value and faster response speed. This work reveals the important role of polaron distribution in enhancing the performance of n-type OECTs.
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