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The Role of Local Fields in the Optical Properties of Silicon Nanocrystals

Published online by Cambridge University Press:  01 February 2011

Fabio Trani ,
Domenico Ninno ,
Giovanni Cantele  and
Giuseppe Iadonisi
Fabio Trani
Affiliation:
trani@na.infn.it, University of Naples "Federico II", Department of Physics, via Cintia, Complesso Universitario di Monte Sant'Angelo, Naples, I-80126, Italy, 0039081676855, 0039081676346
Domenico Ninno
Affiliation:
ninno@na.infn.it, Coherentia CNR-INFM and University of Naples "Federico II" - Department of Physics, Complesso Universitario di Monte Sant'Angelo, via Cintia, Napoli, I-80126, Italy
Giovanni Cantele
Affiliation:
cantele@na.infn.it, Coherentia CNR-INFM and University of Naples "Federico II" - Department of Physics, Complesso Universitario di Monte Sant'Angelo, via Cintia, Napoli, I-80126, Italy
Giuseppe Iadonisi
Affiliation:
iadonisi@na.infn.it, Coherentia CNR-INFM and University of Naples "Federico II" - Department of Physics, Complesso Universitario di Monte Sant'Angelo, via Cintia, Napoli, I-80126, Italy
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Abstract

In this paper we discuss the role of local fields in the optical properties of silicon nanocrystals. Using a semiempirical tight binding approach, local field effects are included into the linear response theory, going beyond the standard independent particle approximation. The results show that local field effects give an important contribution to the optical properties of silicon nanocrystals, leading to a strong suppression of the absorption in the visible spectral range. This effect is attributed to the classical surface polarization contribution. A comparison between the atomistic tight binding approach and a classical dielectric model shows that the dielectric model gives reasonable results not only for large, but even for small silicon nanocrystals.

Keywords

optical propertiesnanostructureSi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 958: Symposium L – Group IV Semiconductor Nanostructures—2006 , 2006 , 0958-L08-09
Copyright
Copyright © Materials Research Society 2007

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References

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