Dynamic Responses of Photoconduction in TiOx Films Prepared by Radio Frequency Magnetron Sputtering

The photoexcitation and decay of photoconduction with UV irradiation have been studied in titanium oxide films prepared by the rf magnetron sputtering. Dynamic responses of photocurrent are represented by a stretched exponential function, and a long-term photocurrent decay suggests that the photoexcited carriers recombine under potential fluctuations (band-edge modulations of the conduction and valence bands). Important physical parameters related to the band-edge profiles are given by our proposed model. (C) 2010 The Japan Society of Applied Physics