Optical gain spectra in ZnO thin films were observed by pump-probe method. The carrier density in this experiment was estimated to be n=2.7x10(19) cm(-3) and bandgap energy shift was estimated to be 350 meV from the optical gain spectra. Renormalized bandgap energy was calculated using two theoretical models and was compared with the experimental results. It was found that Beni and Rice's model explains the experimental data. (C) 2002 Elsevier Science Ltd. All rights reserved. References: 18
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