ZnO films of different thicknesses were grown on Al2O3 (112̄0) substrates by metalorganic chemical vapor deposition. Characterizations using X-ray diffraction and scanning electron microscopy demonstrated the transition from two-dimensional growth to three-dimensional growth with an increase in film thickness. Photoluminescence spectra revealed the thickness dependence of the exciton peak and a stimulated emission due to exciton-exciton scattering was observed.
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Zhang et al. (2004) studied this question.
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