Carrier mobility is a basic parameter of organic semiconductors. In this paper, hole mobility of zinc phthalocyanine (ZnPc) thin films was determined by light-intensity-dependent current-voltage characteristics. Firstly, built-in voltage, V_(bi), of the organic diode with the structure of "ITO/zinc phthalocyanine (ZnPc)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)/Al" was measured as 0.45 V by using saturation photovoltage method. Based on the value of V_(bi), the hole mobility of ZnPc thin film was (1.619 ± 0.06) × 10~(-6) cm~2 V~(-1) s~(-1) by fitting the measured photocurrent-voltage characteristic with the established theory of space-charge-limited photocurrent conduction. The measured carrier mobility coincides with that reported in other literature.
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