虑及栅电极极化及吸附电荷影响的有机电化学晶体管<i>Ⅰ</i>-<i>Ⅴ</i>特性研究

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Ⅰ-Ⅴ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Ⅰ-Ⅴ特性研究

刘燃 ^1, ,
彭钰博 ^2, ,
黄庆 ^3, ,
杨兴 ^4, ,
贾月梅 ^{1,
,} ,
杜衍 ^{5,
,} ,
冀健龙 ^{6,7,
,}

1.
太原理工大学机械与运载工程学院, 晋中 030600;
2.
太原理工大学生物医学工程学院, 晋中 030600;
3.
陆军军医大学大坪医院检验科, 重庆 400042;
4.
清华大学精密仪器与机械学系微机电系统实验室, 北京 100084;
5.
中国科学院长春应用化学研究所, 电分析化学国家重点实验室, 长春 130022;
6.
太原理工大学信息与计算机学院, 晋中 030600;
7.
清华大学集成电路学院, 北京 100084

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（C_G）（24.01~120.10μF）。结果表明，OECT跨导峰值随着C_G的增加而增大；设置栅电极电压（V_G）为+0.6 V时，半导体沟道电流（I_DS，l）随着C_G的增大而单调上升；设置V_G为–0.6 V时，I_DS，l随着C_G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，I_DS，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。

关键词:

English

Current-Voltage Characteristics of Organic Electrochemical Transistors Considering Effects of Gate Polarization and Adsorbed Charge

LIU Ran ^1, ,
PENG Yu-Bo ^2, ,
HUANG Qing ^3, ,
YANG Xing ^4, ,
JIA Yue-Mei ^{1,
,} ,
DU Yan ^{5,
,} ,
JI Jian-Long ^{6,7,
,}

1.
College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Jinzhong 030600, China;
2.
College of Biomedicine Engineering, Taiyuan University of Technology, Jinzhong 030600, China;
3.
Department of Laboratory Medicine, Army Medical University, Chongqing 400042, China;
4.
MEMS Lab, Department of Precision Instruments&Mechanology, Tsinghua University, Beijing 100084, China;
5.
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
6.
College of Information and Computer, Taiyuan University of Technology, Jinzhong 030600, China;
7.
School of Integrated Circuits, Tsinghua University, Beijing 100084, China

Corresponding author: JIA Yue-Mei, ; DU Yan, ; JI Jian-Long,

Received Date: 08 January 2022
Revised Date: 04 April 2022
Fund Project:
Supported by the National Natural Science Foundation of China(No. 52175542), the Natural Science Foundation of Shanxi Province(No. 20210302123136), the Natural Science Foundation of Chongqing(No. cstc2020jcyj-msxmX0002), the Postdoctoral Foundation of China(No. 2020M673646) and the Science and Technology Development Program of Jilin Province Key Research and Development Project(No. 20210204126YY).

Abstract: Organic electrochemical transistors(OECTs) are widely used in biosensing due to their good biocompatibility, low operating voltage, and excellent signal amplification ability. Functionalization of the gate electrode is crucial for OECTs-based biosensing. However, the existing theory cannot describe the influences of polarization and charge adsorption on the current-voltage(I-V) characteristics. In this work, the Bernards-Malliaras I-V characteristic is modified by constructing the series model of differential capacitance formed at gate/electrolyte and semiconductor-channel/electrolyte interfaces. The effectiveness of the modified model is discussed by experimental investigations, including changing the potentiostatic electrodeposition time, regulating the thickness of poly(3,4-ethylenedioxythio-phene):poly(styrenesulfonate) (PEDOT:PSS) film formed on the surface of the gate-electrode(0.80-3.73 μm) and the gate-electrode/electrolyte interface capacitance(C_G) (24.01-120.10 μF). Experimental results show that the transconductance peak increases with the C_G increments; when the gate electrode voltage(V_G) is set as +0.6 V, the current flowing in the semiconductor channel current(I_DS,l) increases monotonically with the C_G increments; When V_G is set as-0.6 V, I_DS,l decreases monotonically with the C_G increments. In addition, the aptamer probes anchored on the gate-electrode react specifically with different concentrations of adenosine triphosphate(10^-12-10^-5 mol/L).Experimental results show that I_DS,l decreases with the increments of the adenosine triphosphate concentration,and thus, the amount of adsorbed charge. The qualitative theoretical analyses are consistent with the experimental results. The modified theoretical model proposed herein is expected to provide theoretical support for designing of OECTs and OECTs based biosensors.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

虑及栅电极极化及吸附电荷影响的有机电化学晶体管Ⅰ-Ⅴ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

English

Current-Voltage Characteristics of Organic Electrochemical Transistors Considering Effects of Gate Polarization and Adsorbed Charge

Corresponding author: JIA Yue-Mei, ; DU Yan, ; JI Jian-Long,

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

虑及栅电极极化及吸附电荷影响的有机电化学晶体管Ⅰ-Ⅴ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

English

Current-Voltage Characteristics of Organic Electrochemical Transistors Considering Effects of Gate Polarization and Adsorbed Charge

Corresponding author: JIA Yue-Mei, ; DU Yan, ; JI Jian-Long,

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

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