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

doi:10.1088/1674-1056/abe3e4

Abstract 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.

Keywords: current injection organic thin film capacitance-voltage parasitic resistance

Received: 23 December 2020
Revised: 27 January 2021
Accepted manuscript online: 07 February 2021

PACS:	73.23.Ra	(Persistent currents)
	73.61.Le	(Other inorganic semiconductors)
	84.37.+q	(Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.))
	73.40.Cg	(Contact resistance, contact potential)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11874007 and 12074076).

Corresponding Authors: An-Ran Yu, Xiao-Yuan Hou
E-mail: 12110190029@fudan.edu.cn;xyhou@fudan.edu.cn

Cite this article:

Ming Chu(褚明), Shao-Bo Liu(刘少博), An-Ran Yu(蔚安然), Hao-Miao Yu(于浩淼), Jia-Jun Qin(秦佳俊), Rui-Chen Yi(衣睿宸), Yuan Pei(裴远), Chun-Qin Zhu(朱春琴), Guang-Rui Zhu(朱光瑞), Qi Zeng(曾琪), and Xiao-Yuan Hou(侯晓远) Accurate capacitance-voltage characterization of organic thin films with current injection 2021 Chin. Phys. B 30 087301

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