Article: Structural and optical properties of Dy doped ZnO thin films prepared by pyrolysis technique Journal: International Journal of Nanotechnology (IJNT) 2010 Vol.7 No.9/10/11/12 pp.1087 - 1097 Abstract: Structural, optical and Raman scattering studies have been performed on the Dy substituted zinc oxide (ZnO) thin films (1, 3 & 5 wt%) fabricated through a sol gel based spray pyrolysis technique on preheated glass substrates. The hexagonal crystal structure with (002) preferred orientation was confirmed from the X-ray diffraction analysis for the undoped and Dy doped ZnO films. The crystallinity of the films decreased with increasing Dy content with a corresponding decease in the intensity of (002) orientations. Reduction in grain size with increase in Dy content was observed. The shift of E<SUB align="right"><SMALL>2</SMALL></SUB> (high) mode observed in the Raman spectra towards the lower wave numbers with increase in Dy concentration was correlated with the increase in stress on the ZnO matrix upon Dy substitution. The optical band gap was found to increase from 3.17 eV to 3.27 eV with a transparency of 80% for higher Dy concentrations. A blue shift in the NBE emission was also observed for Dy doping. Inderscience Publishers - linking academia, business and industry through research

Title: Structural and optical properties of Dy doped ZnO thin films prepared by pyrolysis technique

Authors: P. Ilanchezhiyan, G. Mohan Kumar, A. Vinu, Salem S. Al-Deyab, R. Jayavel

Addresses: Centre for Nanoscience and Technology, Anna University, Chennai 600 025, India. ' Centre for Nanoscience and Technology, Anna University, Chennai 600 025, India. ' International Center for Materials Nanoarchitectonics, World Premier International (WPI) Research Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. ' Faculty of Science, Department of Chemistry, King Saud University, P.O. Box 2455 Riyadh 11451, Saudi Arabia. ' Centre for Nanoscience and Technology, Anna University, Chennai 600 025, India

Abstract: Structural, optical and Raman scattering studies have been performed on the Dy substituted zinc oxide (ZnO) thin films (1, 3 & 5 wt%) fabricated through a sol gel based spray pyrolysis technique on preheated glass substrates. The hexagonal crystal structure with (002) preferred orientation was confirmed from the X-ray diffraction analysis for the undoped and Dy doped ZnO films. The crystallinity of the films decreased with increasing Dy content with a corresponding decease in the intensity of (002) orientations. Reduction in grain size with increase in Dy content was observed. The shift of E₂ (high) mode observed in the Raman spectra towards the lower wave numbers with increase in Dy concentration was correlated with the increase in stress on the ZnO matrix upon Dy substitution. The optical band gap was found to increase from 3.17 eV to 3.27 eV with a transparency of 80% for higher Dy concentrations. A blue shift in the NBE emission was also observed for Dy doping.

Keywords: II-VI semiconductors; X-ray diffraction; optical properties; Raman studies; structural properties; ZnO thin films; zinc oxide; spray pyrolysis; sol gel; dysprosium; dy doping; nanotechnology.

DOI: 10.1504/IJNT.2010.034713

International Journal of Nanotechnology, 2010 Vol.7 No.9/10/11/12, pp.1087 - 1097

Published online: 17 Aug 2010 *

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Title: Structural and optical properties of Dy doped ZnO thin films prepared by pyrolysis technique

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