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First-Principles Study of Charge Carrier Dynamics with Explicit Treatment of Momentum Dispersion on Si Nanowires along <211> crystallographic Directions

Published online by Cambridge University Press:  13 August 2018

Fatima ,
Jon Vogel ,
Talgat Inerbaev ,
Nuri Oncel  and
Dmitri Kilin Open the ORCID record for Dmitri Kilin [Opens in a new window]
Fatima
Affiliation:
Department of Physics & Astrophysics, University of North Dakota, Grand Forks, North Dakota 58202, USA
Jon Vogel
Affiliation:
Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108, USA
Talgat Inerbaev
Affiliation:
L.N. Gumilyov Eurasian National University, Astana 010008, Kazakhstan
Nuri Oncel
Affiliation:
Department of Physics & Astrophysics, University of North Dakota, Grand Forks, North Dakota 58202, USA
Dmitri Kilin*
Affiliation:
Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108, USA
*
*(Email: [email protected])
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Abstract

The ground state structure, optical properties and charge carrier dynamics of silicon nanowire (SiNW) grown in <211> crystallographic direction is studied as a function of wavevector using density functional theory. This nanowire can be used as fundamental unit of nanoelectronic devices. The optical properties are computed under assumption of momentum conservation$\Delta \vec{k} = 0$. The on-the-fly non-adiabatic couplings for electronic degrees of freedom are obtained along the ab initio molecular dynamics nuclear trajectories, which are used as parameters for Redfield density matrix equation of motion. By investigating the photo-induced process on this nanowire, it is shown that high-energy photoexcitation relaxes to the band gap edge within 75 ps. The results of these calculations help to understand the mechanism of electron transfer process on the Si nanowire.

Keywords

nanostructureSielectronic structureelectron-phonon interactionsoptical properties
Type
Articles
Information
MRS Advances , Volume 3 , Issue 59: Electronic and Photonic Materials , 2018 , pp. 3477 - 3482
Copyright
Copyright © Materials Research Society 2018 

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References

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