Abstract
The growth of nanoparticles embedded in a host matrix can lead to substantial strain. Strain can have a substantial influence on the properties of nanoparticles. In this work, Si nanoparticles embedded in an amorphous Al2O3 matrix were fabricated using pulsed laser deposition and rapid thermal annealing. The strain-induced structural transition from the cubic phase to the hexagonal phase was observed during the rapid thermal annealing process and led to the decrease of the band gap caused by the hexagonal crystalline phase. It was found that the microstructures and photoluminescence of Si nanoparticles are closely related to strain. Thus, strain engineering is an effective tool for tailoring the optical properties of Si nanoparticles.
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