Photoconductive gain and low-frequency noise characteristics of ZnO nanorods

摘要

This investigation elucidates the characteristics of Schottky barrier UV sensors with ZnO nanorods. The nanorods are selectively distributed among the interdigitated silver electrodes, which can enable precise positioning and fabrication of the devices inexpensively. The freestanding nanorod provides an efficient light trapping absorption by increasing the photon path length and the photocurrent efficiency, corresponding to a photoconductive gain of G> 10~3. The low-frequency noise analysis can realize qualitative characterization of ZnO nanorod. For a bandwidth of 100 Hz (5 V), the noise equivalent power and normalized detectivity of the devices were 4.81× 10-12 W and 3.22× 1010 cm Hz_(0.5) /W, respectively.