Structural, Optical and Thermoelectrical Properties of Mercury Chromium Sulfide Thin Films Deposited By Novel Chemical Route

Abstract

Semiconducting mercury chromium sulfide thin films were deposited on glass substrate using simple, quick chemical bath deposition method using the mixed aqueous solution of mercury chloride, chromium trioxide, thiourea, EDTA and ammonia. The EDTA was used as the complexing agent. The preparative parameters such as temperature, molar concentration, deposition time and thiourea concentration have been optimized. Thin films of HgxCr2-xS4 (X=0.2) with different thickness were prepared by changing the deposition time at 65 0 c. The structural, morphological, optical and electrical studies were performed by X-ray diffraction, scanning electron microscopy, UV-VIS spectrophotometer and TEP methods respectively. The films are very adherent to the substrate and cubic structure in nature with the preferential orientation (2 2 0). The optical studies showed a film of direct band gap is 2.13eV. Thermoelectric properties show a positive sign exhibiting Ptype semiconducting nature of film.