Abstract
The improving of the crystal quality and pronounced enhancement of photoluminescence intensity from β-FeSi2 were achieved by pre-coating silver (Ag) layers on Si(1 0 0) substrates. A modified-Si surface, which formed during the heating step before β-FeSi2 deposition due to Ag diffusion, was reconstructed the surface into domain structure that minimize the strain caused by lattice matching of β-FeSi2 and Si. This mechanism led to the formation of β-FeSi2 film with very low levels of density of non-radiative recombination centers, and led to the pronounced enhancement of PL intensity.
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