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

    Research output: Contribution to journalArticleAcademicpeer-review

    1 Citation (Scopus)

    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

    Fingerprint

    Energy gap
    Chromium
    Optical properties
    Doping (additives)
    Zinc sulfide
    Spectroscopic ellipsometry
    Growth temperature
    Pulsed laser deposition

    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
    Brakstad, Thomas ; Hope, Benjamin R. ; Nematollahi, Mohammadreza ; Kildemo, Morten ; Podraza, Nikolas J. ; Ghimire, Kiran ; Reenaas, Turid W. / Ellipsometric study of the optical response of ZnS:Cr for PV applications. In: Applied surface science. 2017 ; Vol. 421, No. Part B. pp. 315-319.
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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.",
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    Brakstad, T, Hope, BR, Nematollahi, M, Kildemo, M, Podraza, NJ, Ghimire, K & Reenaas, TW 2017, 'Ellipsometric study of the optical response of ZnS:Cr for PV applications' Applied surface science, vol. 421, no. Part B, pp. 315-319. https://doi.org/10.1016/j.apsusc.2016.10.157

    Ellipsometric study of the optical response of ZnS:Cr for PV applications. / Brakstad, Thomas; Hope, Benjamin R.; Nematollahi, Mohammadreza; Kildemo, Morten; Podraza, Nikolas J.; Ghimire, Kiran; Reenaas, Turid W.

    In: Applied surface science, Vol. 421, No. Part B, 01.11.2017, p. 315-319.

    Research output: Contribution to journalArticleAcademicpeer-review

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    AU - Brakstad, Thomas

    AU - Hope, Benjamin R.

    AU - Nematollahi, Mohammadreza

    AU - Kildemo, Morten

    AU - Podraza, Nikolas J.

    AU - Ghimire, Kiran

    AU - Reenaas, Turid W.

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    AB - 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.

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