E-ISSN 0331-8753 | ISSN 0794-5698
 

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.

Abstract
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


 
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How to Cite this Article
Pubmed Style

Salawu MA, Alabi AB, Adeleke JT, Sulu HT, Sharafa SB. Effects of Temperature on Morphological, Structural and Optical Characteristics of CdTe Films for PV Applications. Nig. J. Basic Appl. Sci.. 2019; 27(1): 10-16. doi:10.4314/njbas.v27i1.2


Web Style

Salawu MA, Alabi AB, Adeleke JT, Sulu HT, Sharafa SB. Effects of Temperature on Morphological, Structural and Optical Characteristics of CdTe Films for PV Applications. www.njbas-udus.com/?mno=279833 [Access: July 24, 2019]. doi:10.4314/njbas.v27i1.2


AMA (American Medical Association) Style

Salawu MA, Alabi AB, Adeleke JT, Sulu HT, Sharafa SB. Effects of Temperature on Morphological, Structural and Optical Characteristics of CdTe Films for PV Applications. Nig. J. Basic Appl. Sci.. 2019; 27(1): 10-16. doi:10.4314/njbas.v27i1.2



Vancouver/ICMJE Style

Salawu MA, Alabi AB, Adeleke JT, Sulu HT, Sharafa SB. Effects of Temperature on Morphological, Structural and Optical Characteristics of CdTe Films for PV Applications. Nig. J. Basic Appl. Sci.. (2019), [cited July 24, 2019]; 27(1): 10-16. doi:10.4314/njbas.v27i1.2



Harvard Style

Salawu, M. A., Alabi, . A. B., Adeleke, . J. T., Sulu, . H. T. & Sharafa, . S. B. (2019) Effects of Temperature on Morphological, Structural and Optical Characteristics of CdTe Films for PV Applications. Nig. J. Basic Appl. Sci., 27 (1), 10-16. doi:10.4314/njbas.v27i1.2



Turabian Style

Salawu, Mufutau Abiodun, Aderemi Babatunde Alabi, Joshua Toyin Adeleke, Hassan Taiwo Sulu, and Salihu Bolaji Sharafa. 2019. Effects of Temperature on Morphological, Structural and Optical Characteristics of CdTe Films for PV Applications. Nigerian Journal of Basic and Applied Sciences, 27 (1), 10-16. doi:10.4314/njbas.v27i1.2



Chicago Style

Salawu, Mufutau Abiodun, Aderemi Babatunde Alabi, Joshua Toyin Adeleke, Hassan Taiwo Sulu, and Salihu Bolaji Sharafa. "Effects of Temperature on Morphological, Structural and Optical Characteristics of CdTe Films for PV Applications." Nigerian Journal of Basic and Applied Sciences 27 (2019), 10-16. doi:10.4314/njbas.v27i1.2



MLA (The Modern Language Association) Style

Salawu, Mufutau Abiodun, Aderemi Babatunde Alabi, Joshua Toyin Adeleke, Hassan Taiwo Sulu, and Salihu Bolaji Sharafa. "Effects of Temperature on Morphological, Structural and Optical Characteristics of CdTe Films for PV Applications." Nigerian Journal of Basic and Applied Sciences 27.1 (2019), 10-16. Print. doi:10.4314/njbas.v27i1.2



APA (American Psychological Association) Style

Salawu, M. A., Alabi, . A. B., Adeleke, . J. T., Sulu, . H. T. & Sharafa, . S. B. (2019) Effects of Temperature on Morphological, Structural and Optical Characteristics of CdTe Films for PV Applications. Nigerian Journal of Basic and Applied Sciences, 27 (1), 10-16. doi:10.4314/njbas.v27i1.2