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Structural, optical and nanomechanical properties of (1 1 1) oriented nanocrystalline ZnTe thin films

Kiran, MSRN and Kshirsagar, S and Krishna, MG and Surya, Tewari P (2010) Structural, optical and nanomechanical properties of (1 1 1) oriented nanocrystalline ZnTe thin films. In: The European Physical Journal Applied Physics, 51 (1). 10502 .

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Abstract

Structural, optical and nanomechanical properties of nanocrystalline Zinc Telluride (ZnTe) films of thickness upto 10 microns deposited at room temperature on borosilicate glass substrates are reported. X-ray diffraction patterns reveal that the films were preferentially oriented along the (1 1 1) direction. The maximum refractive index of the films was 2.74 at a wavelength of 2000 nm. The optical band gap showed strong thickness dependence. The average film hardness and Young's modulus obtained from load-displacement curves and analyzed by Oliver-Pharr method were 4 and 70 GPa respectively. Hardness of (1 1 1) oriented ZnTe thin films exhibited almost 5 times higher value than bulk. The studies show clearly that the hardness increases with decreasing indentation size, for indents between 30 and 300 nm in depth indicating the existence of indentation size effect. The coefficient of friction for these films as obtained from the nanoscratch test was ~0.4.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Cambridge University Press.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 19 Aug 2011 10:18
Last Modified: 19 Aug 2011 10:18
URI: http://eprints.iisc.ernet.in/id/eprint/39978

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