Accurate capacitance-voltage characterization of organic thin films with current injection

• 作者: Ming Chu Shao-Bo Liu An-Ran Yu Hao-Miao Yu Jia-Jun Qin Rui-Chen Yi Yuan Pei Chun-Qin Zhu Guang-Rui Zhu Qi Zeng Xiao-Yuan Hou
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
• 页码范围: 526-533
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/abe3e4

摘要

To deal with the invalidation of commonly employed series model and parallel model in capacitance-voltage (C-V) characterization of organic thin films when current injection is significant,a three-element equivalent circuit model is proposed.On this basis,the expression of real capacitance in consideration of current injection is theoretically derived by small-signal analysis method.The validity of the proposed equivalent circuit and theoretical expression are verified by a simulating circuit consisting of a capacitor,a diode,and a resistor.Moreover,the accurate C-V characteristic of an organic thin film device is obtained via theoretical correction of the experimental measuring result,and the real capacitance is 35.7％ higher than the directly measured capacitance at 5-V bias in the parallel mode.This work strongly demonstrates the necessity to consider current injection in C-V measurement and provides a strategy for accurate C-V characterization experimentally.