Ellipsometric study of the optical response of ZnS:Cr for PV applications

Thomas Brakstad, Benjamin R. Hope, Mohammadreza Nematollahi, Morten Kildemo, Nikolas J. Podraza, Kiran Ghimire, Turid W. Reenaas

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    Abstract

    Optical properties of highly chromium doped (2–4 at.%) zinc sulfide made by pulsed laser deposition have been studied by spectroscopic ellipsometry in the spectral range of 0.73–5.90 eV. The characteristic optical features of the ZnS are a direct bandgap with absorption onset at 3.6 eV, with E0, E1 and E2 critical points around 3.7, 5.7 and 7 eV. Excitonic effects were observed to be strong in this material – in line with the literature. The sub-bandgap absorption accredited to the chromium doping appears as a broad sub-bandgap feature increasing monotonously with increased doping concentration at a given growth temperature. In this report, we discuss three different approaches to extract and analyze the optical properties in terms of the complex dielectric function.
    Original languageEnglish
    Pages (from-to)315-319
    JournalApplied surface science
    Volume421
    Issue numberPart B
    DOIs
    Publication statusPublished - 1 Nov 2017

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    Keywords

    • Cr doped ZnS
    • dielectric function
    • Ellipsometry
    • ZnS

    Cite this

    Brakstad, T., Hope, B. R., Nematollahi, M., Kildemo, M., Podraza, N. J., Ghimire, K., & Reenaas, T. W. (2017). Ellipsometric study of the optical response of ZnS:Cr for PV applications. Applied surface science, 421(Part B), 315-319. https://doi.org/10.1016/j.apsusc.2016.10.157