Organic electrochemical transistors (OECTs) show great promise for flexible, low-cost, and low-voltage sensors for aqueous solutions. The majority of OECT devices are made using the polymer blend poly(ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), in which PEDOT is intrinsically doped due to inclusion of PSS. Because of this intrinsic doping, PEDOT:PSS OECTs generally operate in depletion mode, which results in a higher power consumption and limits stability. Here, a straightforward method to de-dope PEDOT:PSS using commercially available amine-based molecular de-dopants to achieve stable enhancement-mode OECTs is presented. The enhancement-mode OECTs show mobilities near that of pristine PEDOT:PSS (≈2 cm2 V-1 s-1 ) with stable operation over 1000 on/off cycles. The electron and proton exchange among PEDOT, PSS, and the molecular de-dopants are characterized to reveal the underlying chemical mechanism of the threshold voltage shift to negative voltages. Finally, the effect of the de-doping on the microstructure of the spin-cast PEDOT:PSS films is investigated.

中文翻译：

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使用分子去掺杂的增强模式PEDOT：PSS有机电化学晶体管。

有机电化学晶体管（OECT）对于用于水溶液的灵活，低成本和低压传感器显示出巨大的希望。大多数OECT器件使用聚合物共混物聚（乙烯二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）制成，其中PEDOT由于包含PSS而被固有地掺杂。由于这种固有的掺杂，PEDOT：PSS OECT通常以耗尽模式工作，这导致更高的功耗并限制了稳定性。在这里，提出了一种直接的方法，使用市售的基于胺的分子去掺杂剂对PEDOT：PSS进行去掺杂，以实现稳定的增强型OECT。增强模式OECTs的迁移率接近原始PEDOT：PSS（≈2cm2 V-1 s-1），在1000个开/关循环中稳定运行。PEDOT，PSS，分子去掺杂剂的特征在于揭示阈值电压向负电压偏移的潜在化学机理。最后，研究了去掺杂对自旋流延PEDOT：PSS薄膜微观结构的影响。