Red shift in absorption edge of Cd_(1-x)Ni_x S dilute magnetic semiconductor nanofilms

摘要

Nickel-doped cadmium sulphide dilute semiconductor nanofilms (Cd _(1-x) Ni _x S, 0 ≤ x ≤ 0.09) have been investigated using atomic force microscopy, scanning electron microscopy, Fourier infrared transform and UV-Vis spectroscopy. With increasing Ni content a decrease in average crystallite size (26-10 nm) and surface roughness has been found. A red shift in optical band gap has been observed with decrease in average crystallite size, which is against quantum confinement.