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The Role of Selenium Concentration in CdTe Absorber Layer for Solar Cell Applications |
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PP: 33-40 |
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doi:10.18576/ijtfst/140106
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Author(s) |
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Hemant Kumar,
M. S. Dhaka,
Anup Thakur,
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Abstract |
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| In this study, we discussed that the Electricity demand is growing globally on a daily basis. Researchers have developed a low-cost alternative to Silicon-based thin film solar cells based on Cadmium. Polycrystalline Cadmium Telluride (CdTe) with Selenium concentrations of 5%, 10%, and 15% (CdSexTe1-x at x = 0.5 to 0.15) have been prepared on highly cleaned glass substrates. Further this CdSexTe1-x material has been vacuumed sealed and annealed at 250 ͦ C for 1 hour and then for 18 hours at 1150 ͦ C, Thusly CdTe and Se both can melt homogeneously and form CdSexTe1-x materials. The thin films of CdSexTe1-x material of thickness 1μm have been prepared using thermal evaporation techniques at pressure ~10-6 mbar. The optoelectrical parameters have been carried out by applying XRD, UV-Vis-NIR and Current- voltage characterization. The crystallinity size increased with varying concentrations of selenium. The direct energy band gaps have been observed in the range of 1.36 to 1.02 eV. The I-V characteristics of thin films have shown that all thin films are ohmic in nature. All these conditions are required to improve the efficiency of a solar cell.
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