Structure and electronic properties of self-assembled Pt silicide nanowires on Si(100)

摘要

We investigated the formation of Pt silicide nanowires on a Si(100) surface using scanning tunnelling microscopy and high-resolution photoemission spectroscopy. Pt silicide nanowires with a tetragonal Pt_2Si structure are formed along the step edges of Si(100). Pt-induced c(4 X 2) reconstructions also appear adjacent to the tetragonal Pt_2Si nanowires. Formation of the Pt_2Si nanowires is attributed to the anisotropic lattice mismatches between the tetragonal Pt_2Si structure and Si(100). Scanning tunnelling spectroscopy data show that the nanowires are metallic. The stoichiometry of Pt silicide is confirmed by high-resolution photoemission spectroscopy.