Author:
Chu Ming,Liu Shao-Bo,Yu An-Ran,Yu Hao-Miao,Qin Jia-Jun,Yi Rui-Chen,Pei Yuan,Zhu Chun-Qin,Zhu Guang-Rui,Qi-Zeng 琪,Hou Xiao-Yuan
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.
Subject
General Physics and Astronomy