Structure and Some Physical Properties of Chemically Deposited Nickel Sulfide Thin Films

$Ni_2S_{2-x}$ thin films with x=0, 0.5, and 1 were prepared by chemical bath deposition technique. Amorphous structure was discovered by XRD for x=1, while α-Ni₇S₆ and NiS phases were discovered for x=0, and x=0.5 respectively. SEM graphs of the studied films have confirmed the XRD results. Optical band gap values increase from 0.845 to 0.912 eV, with increase of the composition x from 0 to 1. Activation energy values increase in the range from x=0 to x=0.5 and does not change for x=1