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Ion Beam Synthesis of Luminescent SI and GE Nanocrystals in a Silicon Dioxide Matrix

Published online by Cambridge University Press:  22 February 2011

H.A. Atwater ,
K.V. Shcheglov ,
S.S. Wong ,
K.J. Vahala ,
R.C. Flagan ,
M.L. Brongersma  and
A. Polman
H.A. Atwater
Affiliation:
Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA 91125.
K.V. Shcheglov
Affiliation:
Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA 91125.
S.S. Wong
Affiliation:
Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA 91125.
K.J. Vahala
Affiliation:
Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA 91125.
R.C. Flagan
Affiliation:
Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA 91125.
M.L. Brongersma
Affiliation:
FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, Netherlands.
A. Polman
Affiliation:
FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, Netherlands.
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Abstract

Ion beam synthesis of Si and Ge nanocrystals in an SiO2 matrix is performed by precipitation from supersaturated solid solutions created by ion implantation. Films of SiO2 on (100) Si substrates are implanted with Si and Ge at doses 1 × 1016/cm2 - 5 × 1016/cm2. Implanted samples are subsequently annealed to induce precipitation of Si and Ge nanocrystals. Raman spectroscopy and high-resolution transmission electron microscopy indicate a correlation between visible room-temperature photoluminescence and the formation of diamond cubic nanocrystals approximately 2–5 nm in diameter in annealed samples. As-implanted but unannealed samples do not exhibit luminescence. Rutherford backscattering spectra indicate a steepening of implanted Ge profiles upon annealing. Photoluminescence spectra are correlated with annealing temperatures, and compared with theoretical predictions for various possible luminescence mechanisms, such as radiative recombination of quantum-confined excitons, as well as possible localized state luminescence related to structural defects in SiO2. Potential optoelectronic device applications are also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 316: Symposium A – Materials Synthesis and Processing Using Ion Beams , 1993 , 409
Copyright
Copyright © Materials Research Society 1994

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References

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