Abstract
The structural evolution of Si(5 5 12)-2 × 1 induced by submonolayer Sn atoms has been investigated using scanning tunneling microscopy and synchrotron photoemission spectroscopy. At a Sn coverage of 0.12 ML, Sn atoms induce a well-ordered nanostructure composed of (112) and (113) facets and they are adsorbed selectively on the (112) facet to form Sn/Si(112)-c(2 × 2). Along with the compensating Si(113)-3 × 2 facet, they form the one-dimensional (1D) sawtooth-like nanostructure having a high aspect-ratio and a well-defined cross-section of an average width of 14 nm and an average height of 0.7 nm. After the Sn/Si(112)-c(2 × 2) facet is saturated with Sn atoms, Sn atoms start to be adsorbed on the (113) facets. However, due to the instability of the Sn-adsorbed (113) facet, the ordered nanofacets start to be collapsed. At a coverage of 0.96 ML, the surface loses such regular 1D nanofacets and undergoes a transition from semiconductor to metal.
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