Comparative Studies of the Optical Absorbance and Structural Properties of Ironcopper Sulphide(CuS-Fe) and Iron Lead Sulphide(PbS-Fe) Thin Films Deposited by Silar Method

Victoria N Udeajah ,D U Onah

doi:10.7176/apta/82-04

Abstract

The influence of iron on lead sulphide(PbS) and Copper Sulphide (CuS) thin films deposited on glass substrates via successive ionic layer adsorption (SILAR) Technique using lead acetate, Pb(CH 3 COO) 2 , Cupric Acetate Cu(CH 3 COO) 2 , thioacetamide ( S 2 H 5 NS) , Iron (II) Chloride dehydrate(Fe Cl 2 . 2H 2 O), ethanol and ammonia by in alkaline medium annealed between 283K and 500K was investigated. The structural and morphological studies were performed by X-ray diffraction (XRD) Analysis and scanning electron microscopy(SEM) respectively. The Uv-visible studies were done using spectrometer in the Technical University, Ibadan. The XRD showed films of cubic crystalline PbS thin films, cubic and face-centred crystalline PbSFe thin films, cubic CuS thin film, hexagonal Cu 2 S thin films and cubic and hexagonal crystalline natured CuSFe thin films with the preferential (111),(002)(004) (311) orientations. Keywords : Copper Sulphide thin Films: Lead Sulphide thin Films: Absorbance: structural properties DOI : 10.7176/APTA/82-04 Publication date: January 31 st 2020

Highlights

It is the energy crisis in the world that gave rise to the thin film growth research as a way to cushion problems associated with it
The present study describes successive ionic layer adsorption and reaction method for the synthesis and deposition of PbS, (PbS)x(Fe)1−x, CuS and (CuS)x(Fe) 1−x ternary thin films and the influence of iron added to the halide thin films structurally and morphologically
The X-ray diffraction (XRD) and morphological studies revealed that CuSFe and PbSx(Fe)(1−x) thin films were nanocrystalline in nature depending on film composition

Summary

Introduction

It is the energy crisis in the world that gave rise to the thin film growth research as a way to cushion problems associated with it. An energy obtained from the sun, is the world’s most abundant and cheapest source of energy available from Nature (Nwoke et al, 2008). It is free and automatically renewable every day. Emphasis has shifted from the use of hydro and fossil-powered electricity generation to renewable energy such as solar source through nanotechnology involving growing of thin films from the abundant transition metals, resulting in getting ones with excellent properties that will be useful in solving the problem of energy crisis (Jesuleye and Siyanbola, 2008). Lead sulphide and copper sulphide are studied to ascertain the structural and morphological properties when doped with iron. Lead sulphide (PbS) and Copper Sulphide (Cu 2 S) are groups IV-VI and I-VI compounds of semiconducting materials respectively ( Liang and Whangbo, 1993) that have drawn attention of many researchers because of its properties that have been applied widely in optoelectronic devices, photoconductors, sensors, infra-red detector devices solar cells, solar control and solar absorber coatings (chatterki et al (2012), koao et al (2014), Preetha et al(2015))

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Conclusion