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A Microscopic Model for the Dielectric Function of Porous Silicon

Published online by Cambridge University Press:  15 February 2011

M. Cruz ,
M. R. Beltran ,
C. Wang  and
J. Tagüeña-Martinez
M. Cruz
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70–360, 04510, México, D.F., MEXICO.
M. R. Beltran
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70–360, 04510, México, D.F., MEXICO.
C. Wang
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70–360, 04510, México, D.F., MEXICO.
J. Tagüeña-Martinez
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70–360, 04510, México, D.F., MEXICO.
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Abstract

Micro and nano-structures have opened a new area in materials research since they present interesting phenomena such as efficient luminescence and localization of carriers. An important example of these new materials is porous silicon (PS). It is considered that the quantum confinement is an essential cause of the opto-electronic properties of PS [1], thus microscopic analysis should be performed. We have developed a supercell model to study PS with a tight-binding Hamiltonian, where an sp3s* basis set is used. In an otherwise perfect silicon structure empty columns of atoms are produced and passivated with hydrogen atoms [2]. In this work we calculate the dielectric function and compare it against experimental data for bulk c-Si, ultrathin c-Si films and PS. We discuss the importance of considering the relaxation of the electron wavevector (k) conservation in order to include disorder effects in PS.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 69
Copyright
Copyright © Materials Research Society 1997

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Footnotes

†

Escuela Superior de Ingeniería Mecánica y Eléctrica - UC, IPN, México.

‡

Centro de Investigación en Energia, UNAM, A.P. 34, C.P. 62580, Temixco, Mor., México

References

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