Home|Journals|Articles by Year Follow on Twitter| Subscribe to List

Directory for Medical Articles

Open Access

Original Research

Effects of Temperature on Morphological, Structural and Optical Characteristics of CdTe Films for PV Applications

Mufutau Abiodun Salawu, Aderemi Babatunde Alabi, Joshua Toyin Adeleke, Hassan Taiwo Sulu, Salihu Bolaji Sharafa.

This work presents the physical characterization of 1 m CdTe thin films for photovoltaic applications. 1 m CdTe films were deposited on well cleaned glass substrates by thermal evaporation technique. The effect of annealing temperatures on morphological, structural and optical characteristics of the crystalline CdTe films was investigated at different annealing temperatures (as deposited, 400 and 500 C) for 1 hour. The films were characterized with Scanning Electron Microscope (SEM), X-ray diffraction (XRD) and UV-Visible spectrophotometer. The results revealed that the reflectance characteristics of CdTe films are strongly dependent on the wavelength of electromagnetic spectra. The maximum percentage optical transmittance of CdTe films for as-grown, 400 and 500 degrees Celsius annealed films are 59, 60 and 58 % respectively at 800 nm wavelength. The absorbance of the film decreases with increases in wavelength and found to be 1.65, 1.25 and 0.85 % for the as-grown, 400 and 500 degrees Celsius annealed films respectively. The absorption coefficient exhibits higher values in the shorter wavelength and decreases as the wavelength increases in the visible region of the solar spectrum. The value also decreases with the increases in annealing temperature. High absorption coefficients of 3.9104, 2.9104 and 1.9104 occurred at 400 nm wavelengths for the as-grown, 400 and 500 degrees Celsius annealed CdTe films respectively. The scanning electron microscope studies showed that the films are homogenous and free from crystal defects. The annealing temperatures affect the grain sizes and the band gap. The optical energy band gap is found to be increasing as the annealing temperatures increases. The optical energy band gaps of 1.5, 1.65 and 1.8 eV were obtained for as-grown, 400 and 500 degrees Celsius annealed CdTe films. The obtained results revealed that 1 m CdTe film may be used as absorber layer in CdS/CdTe thin film solar cells due to its band gap.

Key words: CdTe, glass substrate, thermal evaporation, annealing temperature, Energy band gap

Full-text options

Full-text Article

Oxidants and Antioxidants in Medical Science


BiblioMed Home
Follow ScopeMed on Twitter
Author Tools
eJPort Journal Hosting
About BiblioMed
License Information
Terms & Conditions
Privacy Policy
Contact Us

The articles in Bibliomed are open access articles licensed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (https://creativecommons.org/licenses/by-nc-sa/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
ScopeMed is a Database Service for Scientific Publications. Copyright ScopeMed Information Services.