Structure and physical properties of paracrystailine atomistic models of amorphous silicon

P. M. Voyles, N. Zotov, S. M. Nakhmanson, D. A. Drabold, J. M. Gibson, M. M.J. Treacy, P. Keblinski

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We have examined the structure and physical properties of paracrystalline molecular dynamics models of amorphous silicon. Simulations from these models show qualitative agreement with the results of recent mesoscale fluctuation electron microscopy experiments on amorphous silicon and germanium. Such agreement is not found in simulations from continuous random network models. The paracrystalline models consist of topologically crystalline grains which are strongly strained and a disordered matrix between them. We present extensive structural and topological characterization of the medium range order present in the paracrystalline models and examine their physical properties, such as the vibrational density of states, Raman spectra, and electron density of states. We show by direct simulation that the ratio of the transverse acoustic mode to transverse optical mode intensities ITA/ITO in the vibrational density of states and the Raman spectrum can provide a measure of medium range order. In general, we conclude that the current paracrystalline models are a good qualitative representation of the paracrystalline structures observed in the experiment and thus provide guidelines toward understanding structure and properties of medium-range-ordered structures of amorphous semiconductors as well as other amorphous materials.

Original languageEnglish (US)
Pages (from-to)4437-4451
Number of pages15
JournalJournal of Applied Physics
Issue number9
StatePublished - Nov 1 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Voyles, P. M., Zotov, N., Nakhmanson, S. M., Drabold, D. A., Gibson, J. M., Treacy, M. M. J., & Keblinski, P. (2001). Structure and physical properties of paracrystailine atomistic models of amorphous silicon. Journal of Applied Physics, 90(9), 4437-4451.