Synthesis and characterization of bismuth selenide thin films by chemical bath deposition technique

Abstract

Thin films of bismuth selenide were prepared by chemical bath deposition technique onto glass at 55°C. The deposition parameters such as time, temperature of deposition and <i>p</i>H of the solution were optimized. The set of films having different elemental compositions was prepared by varying Bi/Se ratio from 0.93 to 2.03. The composition, morphology, structure, optical absorption and electrical conductivity of the films were studied. Characterization includes X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive X-ray analysis (EDAX), absorption spectroscopy and electrical conductivity.