Journal
NANO RESEARCH
Volume 8, Issue 12, Pages 3905-3911Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-015-0890-z
Keywords
epitaxy; density functional theory; zinc-blende; Si-Sn alloy
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Funding
- BMBF [03Z2HN12]
- Russian Foundation of Basic Researches [15-32-20560]
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A zinc-blende (sphalerite) crystallographic structure of SnSi nanocrystals generated by molecular-beam epitaxy is observed by electron microscopy techniques in a Si matrix. Ab initio density-functional modeling reveals a stabilizing effect of the Si matrix, which results in the lowest formation enthalpy of SnSi nanocrystals having the unexpected zinc-blende structure. Such nanocrystals could be applied in Si photonics to function as non-centrosymmetric media for the nonlinear optical process of second harmonic generation.
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