Abstract
The photoluminescence excitation and emission techniques are used to monitor the absorption and emission characteristics of silicon nanocrystals. Contributions from various critical points are identified and their shift as a function of reduction in particle size is deduced. A red shift in the direct band gap energy of silicon with decreasing crystal size is experimentally observed for the first time. The results are explained on the basis of quantum confinement in silicon nanocrystals.
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