MOLECULAR-STRUCTURE OF POROUS SI

Nanocrystalline Si particles of 10 nm size, doped with traces (1 at. % ) of Sn, are prepared by mechanical attrition in an inert ambient. Aft er stain-etching, the particles photoluminesce at room Sn-119 Mossbaue r spectroscopy, Raman scattering, photoluminesce, and Fourier temperat ure. transform infrared spectroscopy measurements performed as a funct ion of stain-etching time reveal systematic changes, and suggest that the molecular structure of porous Si consists of nanocrystalline Si pa rticles with surfaces passivated by H and/or O atoms. (C) 1995 America n Institute of Physics.