RAMAN SHIFTS IN SI NANOCRYSTALS

Raman shifts of Si nanocrystals versus size were studied theoretically by a bond polarizability model. Zero-dimensional spheres and one-dime nsional columns were considered. The relation between the Raman shift and the size for Si spheres and columns was established, from which th e size of Si nanocrystals can be obtained for a given Raman shift or v ice versa. (C) 1996 American Institute of Physics.