Optical and electrical resistivity studies of isovalent and aliovalenttransition metal ion doped ZnO
- 30 July 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 80 (4), 045210
- https://doi.org/10.1103/physrevb.80.045210
Abstract
In this paper, we report on the optical and electrical transport studies of TM ion (Ni, Ti, V, Fe, Cr, Mn, and Co) doped ZnO polycrystalline samples. Diffuse reflectance spectroscopy of doped ZnO showed the existence of absorption bands which were attributed to the transitions of respective dopants. Electrical resistivity was found to decrease in case of Ti-, V-, Fe-, and Ni-doped ZnO bulk samples as compared to undoped. We explain the above behavior on the basis of impurity -band splitting model. It is observed that with increase in dopant content the temperature range where variable-range hopping is valid shrinks to lower values and the activation energy lowers. Increase in characteristic temperature and decrease in localization length was observed with increase in TM ion content pointing towards the delocalization of electrons that sets in with doping.
Keywords
This publication has 55 references indexed in Scilit:
- Structure, microstructure and physical properties of ZnO based materials in various forms: bulk, thin film and nanoJournal of Physics D: Applied Physics, 2007
- Radial ZnO nanowire nucleation on amorphous carbonsApplied Physics Letters, 2005
- AN INVESTIGATION ON THE PRESENCE OF NiAl2O4 IN A STABLE Ni ON ALUMINA CATALYST FOR DRY REFORMINGJournal of the Chilean Chemical Society, 2005
- Magnetic order in Co-doped and (Mn, Co) codoped ZnO thin films by pulsed laser depositionJournal of Applied Physics, 2004
- Iron oxide mineralogy in late Miocene red beds from La Gloria, Spain: rock-magnetic, voltammetric and Vis spectroscopy analysesCATENA, 2003
- Effect of Pressure on Phonon Modes in Wurtzite Zinc OxideHigh Pressure Research, 2002
- Zener Model Description of Ferromagnetism in Zinc-Blende Magnetic SemiconductorsScience, 2000
- Low-temperature electrical conductivity and optical absorption edge of ZnO films prepared by chemical vapour depositionphysica status solidi (a), 1995
- Effective deactivation of the ZnS visible photoluminescence by iron impuritiesPhysical Review B, 1985
- The solubility of transition metal oxides in zinc oxide and the reflectance spectra of Mn2+ and Fe2+ in tetrahedral fieldsJournal of Inorganic and Nuclear Chemistry, 1966