School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
Mater Horiz. 2022 Aug 30;9(9):2408-2415. doi: 10.1039/d2mh00496h.
Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) based organic electrochemical transistors (OECTs) have proven to be one of the most versatile platforms for various applications including bioelectronics, neuromorphic computing and soft robotics. The use of PEDOT:PSS for OECTs originates from its ample mixed ionic-electronic conductivity, which in turn depends on the microscale phase separation and morphology of the polymer. Thus, modulation of the microstructure of PEDOT:PSS film enables us to tune the operation and device characteristics of the resulting OECT. Herein we report enhanced transconductance (20 mS), fast switching (32 μs) and stable operation (10 000 cycles) of modified PEDOT:PSS based OECTs using 15-crown-5 as an additive. Four probe measurements reveal an increased electronic conductivity of the modified PEDOT:PSS film (∼450 S cm) while tapping mode atomic force microscopy shows an increased phase separation. Further detailed characterization using spectroelectrochemistry, X-ray photoelectron spectroscopy (XPS) and grazing incidence wide-angle X-ray diffraction (GIWAXS) provides insight into the microstructural changes brought about by the crown ether additive that result in the desirable characteristics of the modified PEDOT:PSS film.
基于聚(3,4-亚乙基二氧噻吩)：聚苯乙烯磺酸盐(PEDOT:PSS)的有机电化学晶体管(OECT)已被证明是最通用的平台之一，可用于各种应用，包括生物电子学、神经形态计算和软机器人。将 PEDOT:PSS 用于 OECT 源于其丰富的混合离子-电子导电性，而这又取决于聚合物的微尺度相分离和形态。因此，调节 PEDOT:PSS 薄膜的微观结构可以使我们调整所得 OECT 的工作和器件特性。在此，我们报告了使用 15-冠-5 作为添加剂，增强了基于 PEDOT:PSS 的 OECT 的跨导(20 mS)、快速开关(32 μs)和稳定工作(10000 次循环)。四探针测量显示改性 PEDOT:PSS 薄膜的电子电导率提高(∼450 S cm)，而轻敲模式原子力显微镜显示相分离增加。进一步使用光谱电化学、X 射线光电子能谱(XPS)和掠入射广角 X 射线衍射(GIWAXS)的详细特性分析提供了对冠醚添加剂引起的微结构变化的深入了解，这些变化导致了改性 PEDOT:PSS 薄膜的理想特性。
