Effect of Deposition Voltage Variation on the Optical Properties of PbMnS Thin Films Deposited by Electrodeposition Method

A.N. Nwori¹ , L.N. Ezenwaka² , I.E. Ottih³ , N.A. Okereke⁴ , N.S. Umeokwona⁵ , N.L. Okoli⁶ , I. O. Obimma⁷

Section:Research Paper, Product Type: Journal-Paper
Vol.8 , Issue.3 , pp.12-22, Sep-2021

Online published on Sep 30, 2021

Copyright © A.N. Nwori, L.N. Ezenwaka, I.E. Ottih, N.A. Okereke, N.S. Umeokwona, N.L. Okoli, I. O. Obimma . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Semiconductor thin films of lead manganese sulphide (PbMnS) have been successfully deposited on conductive fluorine-doped tin oxide (FTO) glass substrate using an electrodeposition method. Lead acetate (Pb(CH3COO)2) Manganese sulphate (MnSO4.H2O) and Thiourea (CH4N2S) were the starting materials used for sources of lead (Pb), manganese (Mn) and sulphur (S) ions respectively. Deposition voltage was varied and the deposited thin films were characterized to determine the effect of deposition voltage on their optical properties for possible device applications. The results of the characterizations showed that the spectral absorbance, refractive index as well as optical conductivity of the films are generally high but decreases with an increase in wavelength. The optical bandgap energy of the films is in the range of 1.5 eV to 1.9 eV and Urbach energy of the films was found to increase with an increase in the deposition voltage. The optimum deposition voltage for deposition of thin films of this nature is found to be in the range of 1.80 volts to 2.20 volts. These properties exhibited by the deposited thin films of PbMnS position them for applications in solar cells for solar energy harnessing, waveguide application because of their high refractive index value, photodetector and photo-thermal applications owing to their high value of optical conductivity. The bandgap energy of the films is found to be blue-shifted and thus affirm its application for solar energy development. The Urbach energy behaviour envisages that the crystallinity of the films decreases when the films are deposited at higher deposition voltage.

Key-Words / Index Term :
Lead manganese sulphide (PbMnS), Optical properties, Bandgap, Urbah energy, Photodetector

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