Applied Physics, Vol. 3, Issue 2, Jun  2020, Pages 47-59; DOI: https://doi.org/10.31058/j.ap.2020.32003 https://doi.org/10.31058/j.ap.2020.32003

Effect of pH on the Optical and Electrical Properties of PbAgS Ternary Thin Films Deposited by Chemical Bath Deposition

Applied Physics, Vol. 3, Issue 2, Jun  2020, Pages 47-59.

DOI: https://doi.org/10.31058/j.ap.2020.32003

Ezeobele Emmanuel Emeka 1* , Ezenwa Ifeyinwa Amaka 2 , Okoli Nonso Livinus 3

1 Department of Science Laboratory Technology, Federal Polytechnic Oko, Anambra State, Nigeria

2 Department of Industrial Physics, Chukwuemeka Odumegwu Ojukwu University, Uli, Anambra State, Nigeria

3 Department of Physics, Legacy University Okija, Okija, Nigeria

Received: 19 April 2020; Accepted: 15 May 2020; Published: 25 May 2020

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Abstract

This work presents the successful deposition of Lead Silver Sulphide (PbAgS) by simple chemical bath method under varying pH conditions. Varying pH was achieved using different volume concentration of ammonium hydroxide (NH4OH) solution. The final bath solution for the deposition of the films contained aqueous solutions of Pb(NO3)2, AgNO3, thiourea, TEA and EDTA. Pb(NO3)2, AgNO3 and thiourea served as precursors for Pb2+, Ag+, and S2- respectively while EDTA and TEA were used as  complexing agents. NH4OH served as pH adjuster. The deposited film properties were characterized for optical and electrical properties using a Janway UV – VIS spectrophotometer and 4 Point Probe (Keithley Four Point Probe: Model 67005). From the spectral analysis of absorbance, other optical properties such as transmittance, reflectance, refractive index, and extinction coefficient and band gap energy were obtained. The films show high absorbance in the UV region and high transmittance in the VIS – NIR regions, while reflectance is generally low. The films showed direct band gap energy range of 1.89 eV – 2.30 eV. The result showed that band gap decreased as pH increases. Film thickness increased from 493.83 nm to 945.52 nm as pH increases. Electrical properties of the films showed that the deposited PbAgS thin films are semiconducting films with electrical conductivity within the range of 1.337 × 10-3 (s/cm) and 9.334 × 10-3 (s/cm). Electrical conductivity of the films were found to increase as pH increases from 10.30 to 11.20.

Keywords

Optical Properties, Band Gap, CBD, Electrical Properties

Copyright

© 2017 by the authors. Licensee International Technology and Science Press Limited. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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