Journal Press India^®

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Thin films of CdTe deposited by thermal evaporation at evaporation rate of 1000Å thickness on Si substrate.Deposited thin filmthickness is optimized with vacuum deposition conditions by comparing film thickness value from in-process quartz crystal(piezoelectric transducer) with stylus operated dektek surface profiler.CdTe film of thickness 1000 Åhasbeen deposited on silicon substrate by vacuum evaporation method. The thin films are characterized and properties of deposited film depend upon the deposition rate, geometrical position of substrate from the source and surface condition of the silicon substrate. X-ray diffraction (XRD) studyshows that CdTe films are polycrystalline with preferential orientation of (111) plane in cubic phase for 1, 5 & 10 Å/sec deposition rates.Energy dispersive X-ray analysis of CdTe films at 1, 5 & 10 Å/sec deposition rates after quantification gives Te/Cd ratio of 0.98, 1.14 and 1.18 respectively. Scanning electron microscopy (SEM)micrographs of CdTeat different magnifications show grain size in the range of 19-25, 21-28 & 17-20 nm for deposition rates of 1, 5 & 10 Å/sec respectively along the grain boundaries. SEM micrograph at deposition rate of 10 Å/sec has smaller size, smooth, void-free and uniformly distributed over the surface of substrate than the other deposition rates.

Keywords

Physical Vapor Deposition; Film Thickness; CdTe Evaporation; Thin Film Deposition

1. A. A .Ibrahim et. al., Structural and electrical properties of evaporated ZnTe thin film, Journal of Vacuum, 75, 2004 , 189–194


2. E. E. Khawaja et al., Chemical Inhomogeneity in Zinc Telluride thin films prepared by thermal evaporation, Journal of Thin Solid Films, 485, 2005, 16–21


3. S. Larramendi et al., Growth of ZeTe and CdTe films using the isothermal close space sublimation technique in vacuum environment, Journal of Crystal Growth, 312, 2010, 892–896


4. R. R. Singh et.al. Investigation of Passivation Processes for HgCdTe/ CdS structure for Infrared application, Journal of thin solid films, 510, 2006, 235–240


5. R. Pal et. al., Engineering Interface Composition for Passivation of HgCdTe Photodiodes, IEEE Transactions on Electron Devices, 53(11), 2006, 2727-2734


6. K. Nagamani et.al., Properties of Al-doped ZnS Films Grown by Chemical Bath Deposition, Physics Procedia 25, 2012, 137–142


7. F. Gode et. al., Investigations on the Physical properties of the polycrystalline ZnS thin films deposited by chemical bath deposition method, Journal of Crystal Growth, 299, 2007, 136–141


8. Ali Moarrefzadeh et.al., Simulation and Modeling of Physical Vapor Deposition (PVD) Process, Wseas Transactions on Applied and Theoretical Mechanics, 7(2), 2012


9. V. D. Falcão W. A. Pinheiro, C. L. Ferreira, L. R. de O. Cruz, Influence of Deposition Parameters on the Properties of CdTe Films Deposited by Close Spaced Sublimation, Journal of Materials Research, 9(1), 2006, 29-32


10. E. R. Shabban, N. Afify, A. El. Taher, Effect of film thickness on microstructure parameters and optical constants of CdTe thin film, Journal of Alloys and Compunds, 482, 2009, 400-404


11. L. Gouda, Y. R. Aniruddha, S. K. Ramasesha, Correlation between the Solution Chemistry to Observed Properties of CdTe Thin Films Prepared by CBD Method, Journal of Modern Physics, 3, 2012, 1870-1877


12. A. Romeo, G. Khrypunov, S. Galassini, H. Zogg, A. N. Tiwari, N. Romeo, A. Bosio, S. Mazzamuto, Comparison of CSS-CdTe and PVD-CdTe with different activation, 22nd European Photovoltaic Solar Energy Conference, 2007, Milan, Italy


13. M. Estela Calixto, M. L. Albor-Aguilera, M. Tufiño-Velázquez, G. Contreras-Puente, A. Morales-Acevedo, Chemical Bath Deposited CdS for CdTe and Cu(In,Ga)Se2 Thin Film Solar Cells Processing, www.intechopen.com


14. W. A. Pinheiro, V. D. Falcão, L. R. de O. Cruz, C. L. Ferreira, Comparative Study of CdTe Sources Used for Deposition of CdTe Thin Films by Close Spaced Sublimation Technique, Journal of Materials Research, 9(1), 2006, 47-49


15. G. Gordillo, E. Romero et.al., Structural characterization of thin films based on II-VI ternary compounds deposited by evaporation, Journal of Thin Solid Films, 484, 2005, 352–357


16. J. Wang et al., Microwave-assisted synthesis of high quality CdTe/CdS @ ZnS-SiO2 near-infrared-emitting quantum dots and their applications in Hg2+ sensing and imaging, Journal of Sensors and Actuators, B 207, 2015, 74–82


17. Osvaldo de Melo et. al., Growth of CdSe and CdTe crystals shaped by thick alumina membranes, Journal of Crystal Growth, 311, 2008, 26–31


18. K. A. M. H. Siddiquee et al., Investigation of CdS and CdTe thin films and Influence of CdCl2 on CdTe/CdS structure, Journal of Optics, 124, 2013, 4383–4388