Efficient Gating of Organic Electrochemical Transistors with In‐Plane Gate Electrodes

D. Koutsouras, F. Torricelli, Paschalis Gkoupidenis, P. Blom
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引用次数: 9

Abstract

Organic electrochemical transistors (OECTs) are electrolyte‐gated transistors, employing an electrolyte between their gate and channel instead of an insulating layer. For efficient gating, non‐polarizable electrodes, for example, Ag/AgCl, are typically used but unfortunately, this simple approach limits the options for multiple gate integration. Patterned polarizable Au gates on the other hand, show strongly reduced gating due to a large voltage drop at the gate/electrolyte interface. Here, an alternative, simple yet effective method for efficient OECT gating by scalable in‐plane gate electrodes, is demonstrated. The fact that poly(3,4‐ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) exhibits a volumetric capacitance in an electrolyte is made use of. As a result, the capacitance of PEDOT:PSS‐based gates can be strongly enhanced by increasing their thickness, thereby reducing the voltage loss at the gate/electrolyte interface. By combining spin coating and electrodeposition, planar electrodes of various thicknesses are created on a multi‐gated OECT chip and their effect on the gating efficiency, examined. It is shown that the gating performed by an in‐plane PEDOT:PSS electrode can be tuned to be comparable to the one obtained by a Ag/AgCl electrode. Overall, the realization of efficient gating with in‐plane electrodes paves the way toward integration of OECT‐based biosensors and “organ‐on‐a‐chip” platforms.
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平面内栅电极有机电化学晶体管的高效门控
有机电化学晶体管(OECTs)是电解质门控晶体管,在其栅极和沟道之间使用电解质而不是绝缘层。对于高效门控,通常使用非极化电极,例如Ag/AgCl,但不幸的是,这种简单的方法限制了多栅极集成的选择。另一方面,由于栅极/电解质界面处的大电压降,图案极化金栅极显示出强烈的降低门控。在这里,展示了一种替代的,简单而有效的方法,通过可扩展的平面内栅极来实现高效的OECT门控。利用聚(3,4‐乙烯二氧噻吩)聚苯乙烯磺酸盐(PEDOT:PSS)在电解质中表现出体积电容的事实。因此,PEDOT:PSS栅极的电容可以通过增加栅极/电解液界面的厚度来增强,从而降低栅极/电解液界面的电压损失。采用自旋镀膜和电沉积相结合的方法,在多门控OECT芯片上制备了不同厚度的平面电极,并考察了其对门控效率的影响。结果表明,平面内PEDOT:PSS电极的门控可以调谐到与Ag/AgCl电极相当。总体而言,平面内电极高效门控的实现为基于OECT的生物传感器和“器官芯片”平台的集成铺平了道路。
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