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

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

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

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. copyright

Original languageEnglish
Pages (from-to)1087-1097
Number of pages11
JournalInternational Journal of Nanotechnology
Volume7
Issue number9-12
DOIs
StatePublished - Aug 2010

Keywords

  • II-VI semiconductor
  • Optical properties
  • Raman studies
  • X-ray diffraction

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