Photo-response in chemically synthesized ZnSe nanorod for its application as photosensor

Abstract

Zinc Selenide nanorods with varying concentration have been synthesized through the chemical bath deposition method. Concentration-dependent structural and electronic properties of synthesized ZnSe nanorods have been studied in this work. XRD and HRTEM studies indicate the formation of cubic polycrystalline ZnSe nanostructures. The effect of molar concentration, incident light intensity and wavelength on various parameters of fabricated ZnSe based photodetectors have been studied. The photocurrent and thereby other parameters such as photosensitivity, responsivity, detectivity and electron quantum efficiency are seen to decrease with the increase of Zn ion concentration. To investigate the fundamental nature of the dependency of photocurrent on light intensity, Rose’s model of photoconduction is used and the intensity-photocurrent characteristics exhibit sub linear nature. The parameters of ZnSe based photodetectors are calculated and correlated with molar concentration. The effects of incident light intensity and the wavelength on the photodetector properties of ZnSe photodetector are studied thoroughly in this paper.