Synthesis And Characterization Of Transition Metal Chalcogenide Thin Films For Solar PEC Cell Applications

T. Joseph, Sahaya Anand and Zulkifli, Mohd Rosli and Sivarao, Subramonian (2011) Synthesis And Characterization Of Transition Metal Chalcogenide Thin Films For Solar PEC Cell Applications. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Thin films of transition metal chalcogenides MX2 (M - Mo, W, Sn, Cd, Zn and X - Se, S and Te) have been prepared by chemical vapour deposition technique from high purity materials. These materials useful as a high temperature lubricant in the cryogenic rockets and other applications such as photovoltaic cell. photo electrochemical (PEC) solar cell. Transition metal chalcogenides, MoS,.Se2.x is a layered compound, which is widely used in photovoltaic applications similar to binary compound materials (MoS2, MoSe2 , WS2 and WSe2 etc.). Molybdenum chalcogenides, specifically molybdenum selenide, MoSe2 and mol ybdenum sulphide, MoS2 thin films have been successfully deposited onto indium-tin-oxide (ITO) coated glass substrates and stai nless steel substrates by electrodeposition technique. The effects of the deposition time on the growth, structural and optical properties of the films were then studied. By changing the deposition parameters like bath temperature. pH of the bath concentration of the solution, deposition time etc. will yield device quality films. X-ray diffraction (XRD) patterns have confirmed the polycrystalline rhombohedral MoS2 and hexagonal MoS2 phase formation. The results show that the intensity of XRD peaks for these materials increases with the increase of deposition time. UV -VIS spectrophotometric measurement revealed that the optical band gap values of the thin films decreased with the increase of deposition time and lie in the range from 1.12 - 1.22 eV for MoSe2 and 1.65- 1.74 eV for MoS2 thin films. Surface morphology studies by scanning electron microscopy showed uniform and continuous thin film with layered structure surface. The semiconductor parameters of these materials like doping density, band bending, valence band edge etc., are derived from Matt-Schottky plot. These parameters are the deciding factors for photo electrochemical solar cells.

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