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Possible Mechanism of the 30–100 Picoseconds Fast and Efficient Photoluminescence From nc-Si/a-SiO2 Doped with Transition Metals

Published online by Cambridge University Press:  15 February 2011

S. Veprek ,
Th. Wirschem ,
J. Dian ,
S. Perná ,
R. Merica ,
M. G. J. Veprek-Heijman ,
V. Perina ,
M. Fuss  and
X. Lin
S. Veprek
Affiliation:
Institute for Chemistry of Inorganic Materials, Technical University Munich, Lichtenbergstrasse 4, D-85747 Garching/Munich, Germany
Th. Wirschem
Affiliation:
Institute for Chemistry of Inorganic Materials, Technical University Munich, Lichtenbergstrasse 4, D-85747 Garching/Munich, Germany
J. Dian
Affiliation:
Institute for Chemistry of Inorganic Materials, Technical University Munich, Lichtenbergstrasse 4, D-85747 Garching/Munich, Germany
S. Perná
Affiliation:
Institute for Chemistry of Inorganic Materials, Technical University Munich, Lichtenbergstrasse 4, D-85747 Garching/Munich, Germany
R. Merica
Affiliation:
Institute for Chemistry of Inorganic Materials, Technical University Munich, Lichtenbergstrasse 4, D-85747 Garching/Munich, Germany
M. G. J. Veprek-Heijman
Affiliation:
Institute for Chemistry of Inorganic Materials, Technical University Munich, Lichtenbergstrasse 4, D-85747 Garching/Munich, Germany
V. Perina
Affiliation:
Institute of Nuclear Physics, CZ-25068 Rez u Prahy, Czech Republic
M. Fuss
Affiliation:
Institute for Radiochemistry, Technical University Munich, Walther-Meissner-Str. 3, D-85747 Garching, Germany
X. Lin
Affiliation:
Institute for Radiochemistry, Technical University Munich, Walther-Meissner-Str. 3, D-85747 Garching, Germany
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Abstract

The nc-Si/a-SiO2 composite thin films doped with tungsten show very fast and efficient photoluminescence (PL). In order to obtain insight into the PL mechanism we have performed a comparative study with other metals. The results lend support to the suggested mechanism which includes the photogeneration of charge carriers due to efficient absorption of the excitation UV light in the silicon nanocrystals followed by energy transfer to the Wn+ radiative center from which the light emission occurs.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 201
Copyright
Copyright © Materials Research Society 1997

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References

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