School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Munich School of Engineering, Herzig Group, Technische Universität München, Lichtenbergstr. 4a, 85748, Garching, Germany.
Adv Mater. 2019 Jan;31(2):e1805544. doi: 10.1002/adma.201805544. Epub 2018 Nov 12.
Organic electrochemical transistors (OECTs) are highly attractive for applications ranging from circuit elements and neuromorphic devices to transducers for biological sensing, and the archetypal channel material is poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), PEDOT:PSS. The operation of OECTs involves the doping and dedoping of a conjugated polymer due to ion intercalation under the application of a gate voltage. However, the challenge is the trade-off in morphology for mixed conduction since good electronic charge transport requires a high degree of ordering among PEDOT chains, while efficient ion uptake and volumetric doping necessitates open and loose packing of the polymer chains. Ionic-liquid-doped PEDOT:PSS that overcomes this limitation is demonstrated. Ionic-liquid-doped OECTs show high transconductance, fast transient response, and high device stability over 3600 switching cycles. The OECTs are further capable of having good ion sensitivity and robust toward physical deformation. These findings pave the way for higher performance bioelectronics and flexible/wearable electronics.
有机电化学晶体管（OECT）在从电路元件和神经形态器件到生物传感换能器等各种应用中极具吸引力，其典型的沟道材料是聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐），PEDOT：PSS。OECT 的工作原理涉及到在栅极电压作用下，由于离子嵌入，共轭聚合物的掺杂和去掺杂。然而，面临的挑战是混合传导的形态学权衡，因为良好的电子电荷输运需要 PEDOT 链之间高度有序，而高效的离子吸收和体积掺杂则需要聚合物链的开放和松散堆积。本文展示了克服这一限制的离子液体掺杂 PEDOT：PSS。离子液体掺杂的 OECT 表现出高跨导、快速瞬态响应和超过 3600 个开关循环的高器件稳定性。OECT 还具有良好的离子灵敏度和对物理变形的稳健性。这些发现为高性能生物电子学和柔性/可穿戴电子学铺平了道路。
