Frequency-Dependent Electrical Transport Properties of 4, 4′, 4"-Tri(N-carbazolyl)-Triphenylamine Investigated by Impedance Spectroscopy

被引：4
|
作者：
Li Bi-Xin [1 ,2 ]
Chen Jiang-Shan [1 ]
Zhao Yong-Biao [1 ]
Ma Dong-Ge [1 ]
机构：
[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2011年 / 28卷 / 05期
基金：
中国国家自然科学基金;
关键词：
LIGHT-EMITTING-DIODES; AC-IMPEDANCE; CONDUCTION; DEVICES; CELLS; LAYER;
D O I：
10.1088/0256-307X/28/5/057201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Frequency-dependent electrical transport properties of 4, 4', 4''-tri(N-carbazolyl)-triphenylamine (TCTA) are analyzed by impedance spectroscopy (IS) as functions of bias and temperature. The Cole-Cole plot shows a single semicircle which indicates that the equivalent circuit can be designed as a single parallel resistor R(p) and capacitor C(p) network with a series resistance R(s) The bulk capacitance C(p) remains unchanged while the resistance R(p) decreases along with bias voltage. Conduction mechanism matches well with the space-charge-limited current (SCLC) model with exponential trap charge distributions. The temperature-dependent impedance studies reveal the activation energy of 0.246 eV with no phase change in the temperature range 220-320 K. These results indicate that the IS method is applicable for organic semiconductors having a wide band gap.
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页数：4
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