期刊
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
卷 84, 期 -, 页码 112-117出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2016.05.045
关键词
CdZnTe thin films; Physical properties; Electron beam evaporation; Tandem solar cell
资金
- University Grants Commission, New Delhi under MRP scheme [42-828/2013(SR)]
- UGC [5-1/2013(IC)]
- Indo-US Science and Technology Forum (IUSSTF), New Delhi [BASE-2016/I/6]
- University Grants Commission [F.25-1/2014-15 (BSR)/7-123/2007/(BSR)]
The thickness and physical properties of electron beam vacuum evaporated CdZnTe thin films have been optimized in the present work. The films of thickness 300 nm and 400 nm were deposited on ITO coated glass substrates and subjected to different characterization tools like X-ray diffraction (XRD), UV-Vis spectrophotometer, source meter and scanning electron microscopy (SEM) to investigate the structural, optical, electrical and surface morphological properties respectively. The XRD results show that the as deposited CdZnTe thin films have zinc blende cubic structure and polycrystalline in nature with preferred orientation (111). Different structural parameters are also evaluated and discussed. The optical study reveals that the optical transition is found to be direct and energy band gap is decreased for higher thickness. The transmittance is found to increase with thickness and red shift observed which is suitable for CdZnTe films as an absorber layer in tandem solar cells. The current-voltage characteristics of deposited films show linear behavior in both forward and reverse directions as well as the conductivity is increased for higher film thickness. The SEM studies show that the as-deposited CdZnTe thin films are found to be homogeneous, uniform, small circle-shaped grains and free from crystal defects. The experimental results confirm that the film thickness plays an important role to optimize the physical properties of CdZnTe thin films for tandem solar cell applications as an absorber layer. (C) 2016 Elsevier B.V. All rights reserved.
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