Thermally evaporated CdS/CdTe thin film solar cells: Optimization of CdCl2 evaporation treatment on absorber layer |
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| Institution: | 1. Postgraduate Institute of Science, University of Peradeniya, Peradeniya, Sri Lanka;2. Department of Physics, University of Peradeniya, Peradeniya, Sri Lanka;3. Department of Physics and Electronics, Faculty of Science, University of Kelaniya, Kelaniya, Sri Lanka;4. Department of Physics, University of Central Florida, Orlando, FL, 32816, USA |
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| Abstract: | CdCl2 treatment is crucial in the fabrication of highly efficient CdS/CdTe thin-film solar cells. This study reports a comprehensive analysis of thermal evaporated CdS/CdTe thin-film solar cells when the CdTe absorber layer is CdCl2 annealed at temperatures from 340 to 440 °C. Samples were characterized for structural, optical, morphological and electrical properties. The films annealed at 400 °C showed better crystallinity with a cubic zinc blende structure having large grains. Higher refractive index, optical conductivity, and absorption coefficient were recorded for the CdTe films annealed at 400 °C with CdCl2. Optimum photoactive properties for CdS/CdTe thin-film solar cells were also obtained when samples were annealed at 400 °C for 20 min with CdCl2, and the best device exhibited VOC of 668.4 mV, JSC of 13.6 mA cm−2, FF of 53.9% and an efficiency of 4.9%. |
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| Keywords: | Thermal evaporation CdTe Annealing temperature CdS/CdTe Solar cells |
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