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Role of Hydrogenated Surface in the Photoluminescence of Porous Silicon

Published online by Cambridge University Press:  28 February 2011

Masahiko Hirao ,
Tsuyoshi Uda  and
Yoshimasa Murayama
Masahiko Hirao
Affiliation:
Advanced Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350–03, Japan
Tsuyoshi Uda
Affiliation:
Advanced Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350–03, Japan
Yoshimasa Murayama
Affiliation:
Advanced Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350–03, Japan
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Abstract

Optical properties of hydrogenated silicon clusters are investigated by density functional pseudopotential calculation. Transitions between the band-edge orbitals are allowed, in contrast to the indirect gap in bulk silicon. The energy gaps of hydrogenated silicon particles of 15 to 30 Å in diameter are estimated to be 2.0 to 1.5 eV. When the cluster is dehydrogenated, localized states related to dangling bonds appear in the mid-gap, which decrease the photoluminescence intensity. These results agree with much experimental evidence and suggest that the photoluminescence of porous silicon is attributable to hydrogenated silicon particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 283: Symposium F – Microcrystalline Semiconductors–Materials Science and Devices , 1992 , 425
Copyright
Copyright © Materials Research Society 1993

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References

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