虑及栅电极极化及吸附电荷影响的有机电化学晶体管-特性研究

刘燃 彭钰博 黄庆 杨兴 贾月梅 杜衍 冀健龙

引用本文: 刘燃, 彭钰博, 黄庆, 杨兴, 贾月梅, 杜衍, 冀健龙. 虑及栅电极极化及吸附电荷影响的有机电化学晶体管-特性研究[J]. 分析化学, 2022, 50(6): 878-888. doi: 10.19756/j.issn.0253-3820.221015 shu
Citation:  LIU Ran,  PENG Yu-Bo,  HUANG Qing,  YANG Xing,  JIA Yue-Mei,  DU Yan,  JI Jian-Long. Current-Voltage Characteristics of Organic Electrochemical Transistors Considering Effects of Gate Polarization and Adsorbed Charge[J]. Chinese Journal of Analytical Chemistry, 2022, 50(6): 878-888. doi: 10.19756/j.issn.0253-3820.221015 shu

虑及栅电极极化及吸附电荷影响的有机电化学晶体管-特性研究

    通讯作者: 贾月梅,E-mail:jiayuemeityut@163.com; 杜衍,E-mail:duyan@ciac.ac.cn; 冀健龙,E-mail:jijianlong@tyut.edu.cn
  • 基金项目:

    国家自然科学基金项目(No.52175542)、山西省自然科学基金项目(No.20210302123136)、重庆市自然科学基金项目(No.cstc2020jcyjmsxmX0002)、中国博士后基金项目(No.2020M673646)和吉林省科技发展计划项目重点研发项目(No.20210204126YY)资助。

摘要: 有机电化学晶体管(OECT)具有良好的生物兼容性、较低的工作电压以及优异的信号放大能力等特点,被广泛应用于生物传感领域。栅电极修饰是利用OECT进行生物传感的关键,但现有OECT理论无法描述栅电极极化与电荷吸附对电流-电压(I-V)特性关系的影响。本研究通过构建栅电极/电解液、半导体沟道/电解液界面微分电容串联模型修正了Bernards-Malliaras I-V特性关系,并通过实验研究讨论了此修正模型的有效性,具体包括改变恒电位电沉积时间调控栅电极表面PEDOT:PSS薄膜厚度(0.80~3.73μm)以及栅电极/电解液界面电容(CG)(24.01~120.10μF)。结果表明,OECT跨导峰值随着CG的增加而增大;设置栅电极电压(VG)为+0.6 V时,半导体沟道电流(IDS,l)随着CG的增大而单调上升;设置VG为–0.6 V时,IDS,l随着CG的增大而单调下降。在OECT栅电极上修饰适配体探针,并使之与不同浓度的三磷酸腺苷(10-12~10-5 mol/L)发生特异性结合反应,结果表明,IDS,l随三磷酸腺苷浓度即吸附电荷量的增大而减小。定性理论分析结果与实验测试结果一致。本研究提出的修正理论模型有望为OECT及基于OECT的生物传感器的设计提供理论支持。

English


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  • 收稿日期:  2022-01-08
  • 修回日期:  2022-04-04
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