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

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Abstract

Intensity, temperature and frequency-dependent photoabsorption spectroscopy are used to probe trap states in CdS0.44Se0.56 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 (τ = 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.

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Authors and Affiliations

  1. Deptartment of Physics, Applied Physics and Astronomy and Center for Integrated Electronics, Troy, New York, 12180, USA

    Kevin L. Stokes & Peter D. Persans

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  1. Kevin L. Stokes
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  2. Peter D. Persans
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Stokes, K.L., Persans, P.D. Trap States in Cd(S,Se) Nanocrystals Probed by Photomodulation Spectroscopy. MRS Online Proceedings Library 358, 241 (1994). https://doi.org/10.1557/PROC-358-241

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