Eunja Kim, PhD : Research Interests

Liquid and amorphous SiGe:

We generate amorphous Si1-xGex alloys for various Ge compositions, introducing the simulated quenching procedure using ab initio molecular-dynamics approach. The generated structures show a random covalent network rather than a chemically ordered network. The bond length distributions and the vibrational properties of the generated networks do not follow a simple Vegard's rule, suggesting that the networks be inhomogeneous. We find that the local defect structures are governed by the dangling bonds of Ge sites, not Si sites, and Si centered floating bonds in a wide range of Ge compositions of x > 0.15, although the backbonding states of the dangling bond sites change with Ge composition.

Further reading:

E. Kim et al., Phys. Rev. B. 56, 10200 (1997).

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Eunja Kim, University of Nevada Las Vegas
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Last update: January 29, 2005