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Properties of RF sputtered cadmium telluride (CdTe) thin films: Influence of deposition pressure

Kulkarni, R. R., Pawbake, A. S., Waykar, R. G., Rondiya, S. R., Jadhavar, A. A., Pandharkar, S. M., Karpe, S. D., Diwate, K. D. and Jadkar, S. R. 2016. Properties of RF sputtered cadmium telluride (CdTe) thin films: Influence of deposition pressure. Presented at: 2nd International Conference on Emerging Technologies: Micro to Nano 2015 (ETMN-2015), Rajasthan, India, 24-25 October 2015. 2ND INTERNATIONAL CONFERENCE ON EMERGING TECHNOLOGIES: MICRO TO NANO 2015 (ETMN-2015): Contributory papers presented in 2nd International Conference on Emerging Technologies: Micro to Nano 2015. AIP Conference Proceedings , vol. 1. AIP Publishing, 10.1063/1.4945208

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Abstract

Influence of deposition pressure on structural, morphology, electrical and optical properties of CdTe thin films deposited at low substrate temperature (100°C) by RF magnetron sputtering was investigated. The formation of CdTe was confirmed by low angle XRD and Raman spectroscopy. The low angle XRD analysis revealed that the CdTe films have zinc blende (cubic) structure with crystallites having preferred orientation in (111) direction. Raman spectra show the longitudinal optical (LO) phonon mode peak ∼ 165.4 cm-1 suggesting high quality CdTe film were obtained over the entire range of deposition pressure studied. Scanning electron microscopy analysis showed that films are smooth, homogenous, and crack-free with no evidence of voids. The EDAX data revealed that CdTe films deposited at low deposition pressure are high-quality stoichiometric. However, for all deposition pressures, films are rich in Cd relative to Te. The UV-Visible spectroscopy analysis show the blue shift in absorption edge with increasing the deposition pressure while the band gap show decreasing trend. The highest electrical conductivity was obtained for the film deposited at deposition pressure 1 Pa which indicates that the optimized deposition pressure for our sputtering unit is 1 Pa. Based on the experimental results, these CdTe films can be useful for the application in the flexible solar cells and other opto-electronic devices.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Chemistry
Publisher: AIP Publishing
ISBN: 9780735413719
ISSN: 0094-243X
Last Modified: 14 Jul 2020 14:45
URI: http://orca-mwe.cf.ac.uk/id/eprint/133261

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