Stability of Silicon Nanostructures

Unsaturated silicon nanostructures are naturally unstable and can develop into structures of a variety of possible morphologies with coordination largely deviated from four of bulk materials

Rui-Qin Zhang

2013

Key concepts

Scholarcy highlights

  • Unsaturated silicon nanostructures are naturally unstable and can develop into structures of a variety of possible morphologies with coordination largely deviated from four of bulk materials
  • Numerous possible pristine silicon nanostructures including nanospheres and nanowires have been proposed in the literature, including the thinnest silicon nanowire proposed by us
  • There can be some local minima for the tubular structures and one of a gear-like configuration is achievable at an extremely low temperature
  • The surface saturation can be achieved by hydrogenation using HF-etching, which is possible due to the polarization of the Si–Si backbone if F-terminated at the surface
  • Hydrogen-terminated silicon nanoparticles are thermally very stable if the hydrogen coverage is more than 50 %
  • Hydrogenated silicon nanostructures can offer much improved chemical stability over wet oxidation over the hydrogenated bulk surface, due to the size-dependent oxidation, and can be used to fabricate highly stable nanodevices

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