Photoluminescence and cathodoluminescence studies of stoichiometric and oxygen-deficient ZnO films

Wu, X. L.; Siu, G. G.; Fu, C. L.; Ong, H. C.
April 2001
Applied Physics Letters;4/16/2001, Vol. 78 Issue 16, p2285
Academic Journal
Photoluminescence and cathodoluminescence (CL) spectra of stoichiometric and oxygen-deficient ZnO films grown on sapphire were examined. It was found that the intensities of the green and yellow emissions depend on the width of the free-carrier depletion region at the particle surface; the thinner the width, the larger the intensity. Experimental results and spectral analyses suggest that the mechanism responsible for the green (yellow) emission is the recombination of a delocalized electron close to the conduction band with a deeply trapped hole in the single ionized oxygen vacancy V[sub o][SUP ARRANGE="STAGGER"]+] (the single negatively charged interstitial oxygen ion O[sub i][SUP ARRANGE="STAGGER"]-]) center in the particle. © 2001 American Institute of Physics.


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