Determination of trap density in CdSe thin films from thermally stimulated conductivity spectra

Z. Aneva, D. Nesheva, C. Main, S. Reynolds

    Research output: Contribution to journalArticle

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    Abstract

    The trap density Nt and mobility-lifetime product µt in CdSe thin films are investigated combining data from thermally stimulated conductivity and photoconductivity measurements. A method of simultaneous fitting of thermally stimulated conductivity spectra is applied and four peaks at 193, 213, 230 and 258 K are resolved in the temperature range 80-270 K. Temperature dependences of the steady-state photoconductivity under excitation with strongly absorbed light (525 and 630 nm) are measured at photon fluxes of 5x1013 - 5x1015 cm-2.s-1 and temperature dependences of the exponent ? in the intensity dependence of the photoconductivity are obtained. The µt products and trap densities Nt are calculated for both kinds of light excitation. It is shown that they depend on the wavelength of the exciting light, being 2-3 times larger for excitation with ?=630 nm.
    Original languageEnglish
    Pages (from-to)205-208
    Number of pages4
    JournalJournal of Optoelectronics and Advanced Materials
    Volume9
    Issue number1
    Publication statusPublished - 2007

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