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Electrical and optical properties of sublimed films of heavy-fraction rare-earth-element bisphthalocyanines

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Abstract

Steady-state electrical measurements and optical-absorption experiments were performed on 50 nm thick samples of sublimed heavy-fraction rare-earth-element bisphthalocyanines films. From the Arrhenius plot of In Σ(T) (where Σ(T) is the conductivity at temperatureT it was found that two conduction regimes existed. The activation energy of 0.18 eV at high temperatures (T > 162 K) relates to the distance of singlet states below the conduction band. The low-temperature activation energy of 4 meV indicates hopping conduction between localized states close to the Fermi level. Visible optical spectra in both absorption and transmission modes were obtained for the sample. The absorption data were analysed in terms of a well-known power law, and a value of 2.3 eV was found for the optical gap,E 0. Estimates of the refractive indices and the dielectric constants were made over the visible spectrum.

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Authors and Affiliations

  1. Physical Electronics and Fibre-optics Research Group, School of Engineering Information Technology, Sheffield Hallam University, City Campus, Pond Street, S1 1WB, Sheffield, UK

    J. Exley & A. J. Ray

  2. Department of Chemistry and Biological Chemistry, University of Essex, CO4 3SQ, Wivenhoe Park, Colchester, Essex, UK

    M. M. Ahmet & J. Silver

Authors
  1. J. Exley
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  2. A. J. Ray
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  3. M. M. Ahmet
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  4. J. Silver
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Exley, J., Ray, A.J., Ahmet, M.M. et al. Electrical and optical properties of sublimed films of heavy-fraction rare-earth-element bisphthalocyanines. J Mater Sci: Mater Electron 5, 180–184 (1994). https://doi.org/10.1007/BF01198951

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  • DOI: https://doi.org/10.1007/BF01198951

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