T.K. Das Roy
Universidad Autónoma de Nuevo León
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Featured researches published by T.K. Das Roy.
Journal of Physics D | 2010
S. Shaji; A. Arato; J. J. O'Brien; J Liu; G. Alan Castillo; M. I. Mendivil Palma; T.K. Das Roy; Bindu Krishnan
Laser induced changes in the properties of Sb2S3 thin films prepared by chemical bath deposition are described in this paper. Sb2S3 thin films of thickness 550 nm were deposited from a solution containing SbCl3 and Na2S2O3 at 27 °C for 5 h. These thin films were irradiated by a 532 nm continuous wave laser beam under different conditions at ambient atmosphere. X-ray diffraction analysis showed amorphous to polycrystalline transformation due to laser exposure of these thin films. Morphology and composition of these films were described. Optical properties of these films before and after laser irradiation were analysed. The optical band gap of the material was decreased due to laser induced crystallization. The results obtained confirm that there is further scope for developing this material as an optical recording media.
Surface Review and Letters | 2013
R. E. Ornelas-Acosta; S. Shaji; D. Avellaneda; G.A. Castillo; T.K. Das Roy; Bindu Krishnan
In this work, we report the formation of In6Se7 thin films by laser irradiation of In/Se layered structure. Indium layer was deposited on glass substrates by thermal evaporation on which selenium thin film was grown by chemical bath deposition from an aqueous solution containing 10 ml of sodium selenosulphate (0.1 M), 1.0 ml acetic acid (25%) and 70 ml distilled water during 5 min. The In/Se coated glass substrates were irradiated using a 532 nm continuous laser for 3–5 min. Structure, morphology, optical and electrical properties of the irradiated thin films were analyzed using various techniques. X-ray diffraction analysis showed that the irradiated thin films were In6Se7 of monoclinic structure. X-ray photoelectron spectroscopic study on the laser irradiated samples provided uniform relative composition of In and Se in the thin films formed after laser irradiation. The morphology, optical and electrical properties of the irradiated samples were investigated. The optical band gap of the In6Se7 thin films was 2.2 eV and also, the thin films were photoconductive.
Solar Energy Materials and Solar Cells | 2011
C. Garza; S. Shaji; A. Arato; E. Pérez Tijerina; G. Alan Castillo; T.K. Das Roy; B. Krishnan
Applied Surface Science | 2008
B. Krishnan; A. Arato; E. Cardenas; T.K. Das Roy; G.A. Castillo
Solar Energy Materials and Solar Cells | 2009
Emma Cárdenas; A. Arato; E. Perez-Tijerina; T.K. Das Roy; G. Alan Castillo; B. Krishnan
Materials Research Bulletin | 2015
R. E. Ornelas-Acosta; S. Shaji; D. Avellaneda; G.A. Castillo; T.K. Das Roy; Bindu Krishnan
Solar Energy Materials and Solar Cells | 2017
V. Vinayakumar; S. Shaji; D. Avellaneda; T.K. Das Roy; G.A. Castillo; J.A.A. Martinez; B. Krishnan
Journal of Materials Science: Materials in Electronics | 2014
R. E. Ornelas-Acosta; D. Avellaneda; S. Shaji; G.A. Castillo; T.K. Das Roy; Bindu Krishnan
Applied Surface Science | 2015
L.V. Garcia; M.I. Mendivil; G. García Guillén; J.A. Aguilar Martinez; Bindu Krishnan; D. Avellaneda; G.A. Castillo; T.K. Das Roy; S. Shaji
Applied Surface Science | 2011
J.G. Garza; S. Shaji; A.C. Rodriguez; T.K. Das Roy; B. Krishnan
