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Trap States in Cd(S,Se) Nanocrystals Probed by Photomodulation Spectroscopy

Published online by Cambridge University Press:  28 February 2011

Kevin L. Stokes  and
Peter D. Persans
Kevin L. Stokes
Affiliation:
Deptartment of Physics, Applied Physics and Astronomy and Center for Integrated Electronics Rensselaer Polytechnic Institute, Troy, New York 12180
Peter D. Persans
Affiliation:
Deptartment of Physics, Applied Physics and Astronomy and Center for Integrated Electronics Rensselaer Polytechnic Institute, Troy, New York 12180
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Abstract

Intensity, temperature and frequency-dependent photoabsorption spectroscopy are used to probe trap states in CdSo.44Seo.56 nanoparticles in glass. The photoabsorption signal from 6.2 nm radius particles is found to be a combination of two effects: bleaching, due to phase space filling, and an electric-field effect. Frequency-dependent photoabsorption data show that the electric-field effect is caused by a long-lived (r=30 /µs at T=293 K) trap state and that the bleaching occurs on a faster time scale. The trap activation energy obtained from the temperature dependence of the lifetime is 0.23 ±0.06 eV. Only bleaching is observed in the smaller nanocrystallites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 358: Symposium F – Microcrystalline and Nanocrystalline Semiconductors , 1994 , 241
Copyright
Copyright © Materials Research Society 1995

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References

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