Abstract
Time-of-flight (TOF) method is conventional method for measuring of charge transfer properties. However, this method has some drawbacks such as irradiation of UV light, application of high voltage, and limitation of film thickness. Impedance spectroscopy (IS) method can measure the charge mobility without serious damage of the device. In this study, we analyzed charge mobility of polymer film containing triphenylamine derivatives by using IS method and compared the properties with those measured TOF method. As a result, Poole-Frenkel type electric field dependence of the hole mobility was obviously obtained as well as conventional TOF method. Calculated mobility on the order of 10-6cm2/Vs from the IS method also corresponded to the mobility calculated from the TOF method. In addition, Gaussian disorder model analyses of the films were applicable for evaluation of charge transport parameters by using the IS method.
