Journal
APPLIED SURFACE SCIENCE
Volume 392, Issue -, Pages 854-862Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2016.09.095
Keywords
XRD; SEM; UV-vis; Crystallinity; Band gap; Absorption edges
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Funding
- Jahangirnagar University
- Bangladesh Council for Scientific and Industrial Research
- Murdoch University
- University of Sharjah
- Universitas Riau
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In this article Cd-Zn sulphide thin films deposited onto soda lime glass substrates via chemical bath deposition (CBD) technique were investigated for photovoltaic applications. The synthesized films were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet visible (UV-vis) spectroscopic methodologies. A higher degree of crystallinity of the films was attained with the increase of film thicknesses. SEM micrographs exhibited a partial crystalline structure with a particulate appearance surrounded by the amorphous grain boundaries. The optical absorbance and absorption coefficient of the films were also enhanced significantly with the increase in film thicknesses. Optical band-gap analysis indicated a monotonic decrease in direct and indirect band-gaps with the increase of thicknesses of the films. The presence of direct and indirect transitional energies due to the exponential falling edges of the absorption curves may either be due to the lack of long-range order or to the existence of defects in the films. The declination of the optical absorption edges was also confirmed via Urbach energy and steepness parameters studies. (C) 2016 Elsevier B.V. All rights reserved.
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