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

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: 8 January 2022
Revised Date: 4 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).

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.
- Organic electrochemical transistor,
- Biosensor,
- Electrodepolarization,
- Charge adsorption
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