The increasing interest in organic electrochemical transistors (OECTs) for next‐generation bioelectronic applications motivates the design of novel conjugated polymers with good electronic and ionic transport. Many conjugated polymers developed for organic field‐effect transistors (OFETs) exhibit high charge carrier mobilities but they are not suitable for OECTs due to poor ion‐uptake arising from the non polar alkyl chain substituted on the conjugated backbone. They are also sensitive to moisture, resulting in poor performance in aqueous electrolytes. Herein, the widely used conjugated building block diketopyrrolopyrrole (DPP) is used and functionalized it with polar triethylene glycol side chains (PTDPP‐DT) to promote ion penetration. The electrical performance of PTDPP‐DT based OECT in two types of aqueous electrolytes is studied and the electrochemical doping response is investivated. It is found that the tetrafluoroborate (BF₄⁻) anion with large crystallographic radius allows high‐efficiency electrochemical doping of the PTDPP‐DT polymer, and thus gives rise to the high transconductance of 21.4 ± 4.8 mS with good device stability, where it maintained over 91 % of its doped‐state drain current after over 500 cycles of pulse measurement.

中文翻译：

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增强基于二酮吡咯并吡咯的有机电化学晶体管的电化学掺杂效率

对用于下一代生物电子应用的有机电化学晶体管（OECT）的兴趣日益增长，这促使人们设计出具有良好电子和离子传输能力的新型共轭聚合物。许多为有机场效应晶体管（OFET）开发的共轭聚合物均表现出高的电荷载流子迁移率，但由于共轭主链上取代的非极性烷基链引起的离子吸收性差，因此不适用于OECTs。它们还对水分敏感，导致在水性电解质中的性能较差。在此，使用了广泛使用的共轭结构单元二酮吡咯并吡咯（DPP），并通过极性三乙二醇侧链（PTDPP-DT）对其进行了功能化，以促进离子渗透。研究了基于PTDPP-DT的OECT在两种类型的水性电解质中的电性能，并研究了电化学掺杂响应。发现四氟硼酸盐（BF₄ ⁻）具有大结晶半径的阴离子可对PTDPP-DT聚合物进行高效电化学掺杂，因此可产生21.4±4.8 mS的高跨导，并具有良好的器件稳定性，可保持91％以上的掺杂态超过500个脉冲测量周期后，漏极电流。