Journal of Atomic, Molecular, and Optical Physics
Volume 2011 (2011), Article ID 270540, 7 pages
Bandgap Engineering in ZnO By Doping with 3d Transition Metal Ions
1Materials Science Centre, Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai 600025, India
2Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
Received 6 November 2010; Accepted 21 February 2011
Academic Editor: Robert Moshammer
Copyright © 2011 D. Paul Joseph and C. Venkateswaran. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Bulk Zn0.95TM0.05O (, Mn, Fe, Co, and Ni) were synthesized by the standard ceramic method and explored for variation in their band gap energies using Diffuse Reflectance Spectroscopy in the ultraviolet-visible region. Phase quantification and compositional studies were performed using Rietveld analysis of the X-Ray Diffraction patterns, Scanning Electron microscopy, and Energy Dispersive X-Ray Analysis. Due to 3d transition ion doping, the samples have brilliant colors, and the absorption edge of Zn0.95TM0.05O was found to shift towards the visible and ultraviolet-visible region. The blue and red shifts in band gaps observed for various transition metal ion-doped ZnO are discussed.