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Restoration of Porous Silicon Luminescence in Water Vapour

Published online by Cambridge University Press:  15 February 2011

M. S. Brodin ,
V. N. Bykov ,
D. B. Dan'ko ,
R. D. Fedorovich ,
A. A. Kipen' ,
O. E. Kiyayev ,
G. A. Naumovets  and
N. I. Yanushevskii
M. S. Brodin
Affiliation:
Institute of Physics Ukrainian National Academy of Sciences, 46 Prospekt Nauki, Kiev - 22, UA-252022, Ukraine
V. N. Bykov
Affiliation:
Institute of Physics Ukrainian National Academy of Sciences, 46 Prospekt Nauki, Kiev - 22, UA-252022, Ukraine
D. B. Dan'ko
Affiliation:
Institute of Physics Ukrainian National Academy of Sciences, 46 Prospekt Nauki, Kiev - 22, UA-252022, Ukraine
R. D. Fedorovich
Affiliation:
Institute of Physics Ukrainian National Academy of Sciences, 46 Prospekt Nauki, Kiev - 22, UA-252022, Ukraine
A. A. Kipen'
Affiliation:
Institute of Physics Ukrainian National Academy of Sciences, 46 Prospekt Nauki, Kiev - 22, UA-252022, Ukraine
O. E. Kiyayev
Affiliation:
Institute of Physics Ukrainian National Academy of Sciences, 46 Prospekt Nauki, Kiev - 22, UA-252022, Ukraine
G. A. Naumovets
Affiliation:
Institute of Semiconductor Physics, Ukrainian National Academy of Sciences, 45 Prospect Nauki, Kiev 28, UA-252650, Ukraine.
N. I. Yanushevskii
Affiliation:
Institute of Physics Ukrainian National Academy of Sciences, 46 Prospekt Nauki, Kiev - 22, UA-252022, Ukraine
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Abstract

Influence of different adsorbates on recovery of porous Si luminescence was in situ investigated for samples preheated under ultra-high vacuum conditions. Exposure to simple adsorbates (O2, H2, N2 up to a pressure of 10-3 to 10-1 Torr), long exposure to air at the atmosphere pressure, or immersion into distilled water fail to recover the red luminescence. On the other hand, we found that the red luminescence can be recovered by adsorption of water vapour onto the sample surface.

The red luminescence of as-prepared porous Si can be caused by water molecules (together with possible impurities) adsorbed in the pores. The immense surface of the pores provides a large number of emitting sites. The porous Si layer can filter for the emitted light, cutting off the wave region shorter than yellow. The combination of these two factors (emission and filtering) can result in the visible red-orange luminescence of porous Si.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 405: Symposium K – Surface/Interface and Stress Effects in Electronic Materials Nanostructures , 1995 , 197
Copyright
Copyright © Materials Research Society 1996

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