Frequency-Dependent Electrical Transport Properties of 4,4',4
LI Bi-Xin1,2, CHEN Jiang-Shan1, ZHAO Yong-Biao1, MA Dong-Ge1**
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 2Graduate University of Chinese Academy of Sciences, Beijing 100049
Frequency-Dependent Electrical Transport Properties of 4,4',4
LI Bi-Xin1,2, CHEN Jiang-Shan1, ZHAO Yong-Biao1, MA Dong-Ge1**
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 2Graduate University of Chinese Academy of Sciences, Beijing 100049
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 Rp and capacitor Cp network with a series resistance Rs. The bulk capacitance Cp remains unchanged while the resistance Rp 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.
Abstract：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 Rp and capacitor Cp network with a series resistance Rs. The bulk capacitance Cp remains unchanged while the resistance Rp 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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2011, Vol. 28 
