Thermally-stimulated currents in thin-film semiconductors - computer modelling and experiment

C. Main, Z. Aneva, S. Reynolds, N. Souffi, D. Nesheva, R. Bruggemann

    Research output: Non-textual formDigital or Visual Products

    2 Citations (Scopus)

    Abstract

    We apply computer modelling to the multiple-trapping rate equations governing the time-evolution of non-equilibrium distributions of electrons and holes in extended and localised states in thin-film semiconductors, in thermally-stimulated conductivity measurements. We examine in detail the application of this method as a ‘spectroscopy’ of the energy distribution of localised states. Factors influencing energy and density scales are examined critically. Such factors include whether ‘weak’ or ‘strong’ re-trapping prevails during the measurement; the use of non-physical ‘effective’ attempt-to-escape frequencies; the effect of lifetime variation as distributions relax, and whether this can be measured accurately by supplemental steady-state photoconductivity. We show that in some circumstances, the energy scale can be approximated by the quasi-Fermi level position, and suggest further that the density of states may then be computed using the derivative of the quasi-Fermi energy with respect to temperature.
    Original languageEnglish
    PublisherINOE Publishing House
    Publication statusPublished - 2007

    Keywords

    • Thin films
    • Electrical properties
    • Computer simulation
    • Thermally stimulated currents

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  • Cite this

    Main, C. (Author), Aneva, Z. (Author), Reynolds, S. (Author), Souffi, N. (Author), Nesheva, D. (Author), & Bruggemann, R. (Author). (2007). Thermally-stimulated currents in thin-film semiconductors - computer modelling and experiment. Digital or Visual Products, INOE Publishing House. http://www.inoe.ro/Journal.html