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Temperature Dependence and Annealing Effects of Absorption Edges for Selenium Quantum Dots Formed By Ion Implantation In Silica Glass

Published online by Cambridge University Press:  10 February 2011

A. Ueda ,
M. Wu ,
R. Mu ,
Y.-S. Tung ,
D. O. Henderson ,
A. Meldrum ,
R. A. Zuhr ,
J. D. Budai ,
C. W. White  and
J. C. Keay
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A. Ueda
Affiliation:
Chemical Physics Laboratory, Physics Department, Fisk University, Nashville, TN 37208, USA [email protected]
M. Wu
Affiliation:
Chemical Physics Laboratory, Physics Department, Fisk University, Nashville, TN 37208, USA
R. Mu
Affiliation:
Chemical Physics Laboratory, Physics Department, Fisk University, Nashville, TN 37208, USA
Y.-S. Tung
Affiliation:
Chemical Physics Laboratory, Physics Department, Fisk University, Nashville, TN 37208, USA
D. O. Henderson
Affiliation:
Chemical Physics Laboratory, Physics Department, Fisk University, Nashville, TN 37208, USA corresponding author [email protected]
A. Meldrum
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37830, USA
R. A. Zuhr
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37830, USA
J. D. Budai
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37830, USA
C. W. White
Affiliation:
Oak Ridge National Laboratory, Solid State Division, Oak Ridge, TN 37830, USA
J. C. Keay
Affiliation:
Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA
L. C. Feldman
Affiliation:
Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA
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Abstract

We have fabricated Se nanoparticles in silica substrates by ion implantation followed by thermal annealing up to 1000°C, and studied the Se nanoparticle formation by optical absorption spectroscopy, Rutherford backscattering spectrometry, X-ray diffraction, and transmission electron microscopy. The sample with the highest dose (1 × 1017 ions/cm2 ) showed the naonparticle formation during the ion implantation, while the lower dose samples (1 and 3 × 1016 ions/cm2) required thermal treatment to obtain nano-sized particles. The Se nanoparticles in silica were found to be amorphous. After thermal annealing, the particle sizes became larger than the exciton Bohr radius for bulk Se. Thus, the absorption edges for different doses approached the value of bulk after thermal annealing. The temperature dependent absorption spectra were also measured for this system in a temperature range from 15 to 300 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 501
Copyright
Copyright © Materials Research Society 1998

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References

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