High‐Gain Chemically Gated Organic Electrochemical Transistor
High‐Gain Chemically Gated Organic Electrochemical Transistor
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DOI：
10.1002/adfm.202010868
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发表时间：
2021-03
影响因子：
19
通讯作者：
S. T. M. Tan;Alexander Giovannitti;A. Melianas;Maximilian Moser;Benjamin L. Cotts;Devan Singh;I. McCulloch-I
中科院分区：
文献类型：
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作者：
S. T. M. Tan;Alexander Giovannitti;A. Melianas;Maximilian Moser;Benjamin L. Cotts;Devan Singh;I. McCulloch-I
有机电化学晶体管（OECTs）由于其特殊的介电常数而表现出作为低电位的换能器和放大器的有前途的性能，这是通过采用作为通道材料的有机混合离子/电子导体（OMIECs）的体积充电实现的。OECT在水性电解质中的性能以及OMIECs的氧化还原活性已经刺激了大量使用OECTs作为化学转换器的研究。然而，OECT的大（电位导出的）Δ在通常的方法中没有被充分利用，这些方法在OECT电解质内直接进行电流测定化学反应，在分析物和OMIEC之间直接进行电荷转移，这导致栅极到漏极电流的亚单位（sub-unity）转导。因此，电流型OECT不能真正显示传统意义上的电流增益，达不到预期的晶体管性能。这项研究展示了一种替代的设备架构，该架构在两个不同的电化学电池上分离化学转导和放大过程。这种方法充分利用了OECT的大幅度增益，以实现103的电流增益和四个数量级的电流调制。这种转换机制代表了实现高增益化学OECT换能器的一般方法。
Organic electrochemical transistors (OECTs) have exhibited promising performance as transducers and amplifiers of low potentials due to their exceptional transconductance, enabled by the volumetric charging of organic mixed ionic/electronic conductors (OMIECs) employed as the channel material. OECT performance in aqueous electrolytes as well as the OMIECs’ redox activity has spurred a myriad of studies employing OECTs as chemical transducers. However, the OECT's large (potentiometrically derived) transconductance is not fully leveraged in common approaches that directly conduct chemical reactions amperometrically within the OECT electrolyte with direct charge transfer between the analyte and the OMIEC, which results in sub‐unity transduction of gate to drain current. Hence, amperometric OECTs do not truly display current gains in the traditional sense, falling short of the expected transistor performance. This study demonstrates an alternative device architecture that separates chemical transduction and amplification processes on two different electrochemical cells. This approach fully utilizes the OECT's large transconductance to achieve current gains of 103 and current modulations of four orders of magnitude. This transduction mechanism represents a general approach enabling high‐gain chemical OECT transducers.