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Visible luminescence centers in zinc oxide films deposited by spray pyrolysis

V. RAKHESH1,* , M. JUNAID BUSHIRI1, V. K. VAIDYAN1

Affiliation

  1. Thin Film Lab, Department of Physics, University of Kerala, Kariavattom, India

Abstract

Zinc oxide (ZnO) films were deposited by spray pyrolysis. Photoluminescence (PL) and electrical resistance investigations on the samples revealed that oxygen vacancy is a deep donor and singly ionized state of oxygen vacancy (Vo+) is responsible for green luminescence from the samples. The shift observed in luminescence peak with substrate temperature has revealed the effect of local lattice relaxation and crystal imperfections on the visible luminescence of ZnO. The PL spectra of the sample annealed in air suggest that oxygen vacancies are the visible luminescent centers in ZnO and also predict that doubly ionized oxygen vacancy (Vo++) along with zinc vacancy (VZn) may be causing emission at ~2.07 eV in annealed samples..

Keywords

Visible luminescence, ZnO films, Spray pyrolysis.

Submitted at: Aug. 27, 2007
Accepted at: Dec. 7, 2007

Citation

V. RAKHESH, M. JUNAID BUSHIRI, V. K. VAIDYAN, Visible luminescence centers in zinc oxide films deposited by spray pyrolysis, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 12, pp. 3740-3742 (2007)