Optimization of physical properties of vacuum evaporated CdTe thin films with the application of thermal treatment for solar cells |
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| Affiliation: | 1. School of Physics, Beijing Institute of Technology, Beijing 100081, China;2. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;3. Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, UMR CNRS 6502, Nantes 44322, France;1. Department of Physics, Mohanlal Sukhadia University, Udaipur, 313001, India;2. Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar, Mohali, 140306, India;3. Department of Physics, PSG College of Technology, Coimbatore, 641004, India;1. Department of Physics, Mohanlal Sukhadia University, Udaipur 313001, India;2. Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Mohali 140306, India;3. Department of Physics, PSG College of Technology, Coimbatore 641004, India;1. Department of Physics, Mohanlal Sukhadia University, Udaipur 313001, India;2. Microelectronics Research Center, Iowa State University of Science and Technology, Ames, IA 50011, USA;1. Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector 81, SAS Nagar, Mohali 140306, India;2. Department of Physics, Mohanlal Sukhadia University, Udaipur 313001, India |
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| Abstract: | This paper reports the optimization of physical properties of cadmium telluride (CdTe) thin films with the application of thermal treatment. The films of thickness 650 nm were deposited on glass and indium tin oxide (ITO) coated glass substrates employing vacuum evaporation followed by thermal annealing in the temperature range 250–450 °C. The films were characterized using X-ray diffraction (XRD), source meter and atomic force microscopy (AFM) for structural, electrical and surface topographical properties respectively. The X-ray diffraction patterns reveal that films are polycrystalline with predominant zinc-blende structure having preferred reflection (111). The structural parameters are calculated and discussed in detail. The current–voltage characteristics show Ohmic behavior and the electrical conductivity is found to increase with annealing treatment. The AFM studies show that the surface roughness of films is observed to increase with annealing. The experimental results reveal that the thermal annealing plays an important role to enhance the physical properties of CdTe thin films and annealed films may be used as absorber layer in CdTe/CdS solar cells. |
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| Keywords: | CdTe thin films Physical properties Solar cells |
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