A novel approach is introduced to modulate the threshold voltage of organic electrochemical transistors (OECTs) that are fabricated by electropolymerizing the channel material between the source and drain electrodes. To achieve this, we adjust the ratio of two water‐soluble tri‐thiophene monomers, which share the same backbone, but present either anionic or zwitterionic sidechains, during channel formation. This approach allows for a continuous modulation of both the electropolymerization onset potential and the native doping state of the film. We attribute the effect of monomer blends displaying properties that are a weighted average of their components to the formation of nanoscale monomer aggregates that have a uniform internal charge density. Through an investigation of monomer aggregation behavior, polymer film growth, and device properties of OECTs fabricated by electropolymerization, we highlight the importance of monomer aggregation in the electropolymerization of conducting polymers. The ability to tune both electropolymerization onset and the OECT threshold voltage has significant implications for the development of more complex circuits for integrated neuromorphic computing, biosensing, and bioelectronic systems.

中文翻译：

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使用单体共混物调整有机电化学晶体管 （OECT） 阈值电压


引入了一种新的方法来调制有机电化学晶体管 （OECT） 的阈值电压，该晶体管是通过在源极和漏极之间电聚合通道材料来制造的。为了实现这一目标，我们调整了两种水溶性三噻吩单体的比例，它们在通道形成过程中具有相同的主链，但存在阴离子或两性离子侧链。这种方法允许连续调制电聚合起始电位和薄膜的天然掺杂状态。我们将单体共混物显示其成分加权平均值的性质的影响归因于形成具有均匀内部电荷密度的纳米级单体聚集体。通过研究电聚合制备的 OECT 的单体聚集行为、聚合物薄膜生长和器件特性，我们强调了单体聚集在导电聚合物电聚合中的重要性。调节电聚合起始和 OECT 阈值电压的能力对于为集成神经形态计算、生物传感和生物电子系统开发更复杂的电路具有重大意义。