Quasiparticle electronic and optical properties of the Si-Sn system
Rasmus V S Jensen1, Thomas G Pedersen, Arne N Larsen
1Department of Physics and Nanotechnology, Aalborg University, 9220 Aalborg Øst, Denmark.
Abstract:
The Si(1-x)Sn(x) material system is an interesting candidate for an optically active material compatible with Si. Based on density functional theory with quasiparticle corrections we calculate the electronic band structure of zinc-blende SiSn under both compressive and tensile strain. At 2.2% tensile strain the band gap becomes direct with a magnitude of 0.85 eV. We develop an accurate tight-binding parameterization of the electronic structure and calculate the optical properties of SiSn. Furthermore, the silicide SiSn(2) is investigated and found to have metallic character.
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