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Spatially resolved photoluminescence analysis of the role of Se in CdSexTe1−x thin films

Author

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  • A. R. Bowman

    (École Polytechnique Fédérale de Lausanne (EPFL)
    J.J. Thomson Avenue
    Philippa Fawcett Drive)

  • J. F. Leaver

    (University of Liverpool)

  • K. Frohna

    (J.J. Thomson Avenue
    Philippa Fawcett Drive)

  • S. D. Stranks

    (J.J. Thomson Avenue
    Philippa Fawcett Drive)

  • G. Tagliabue

    (École Polytechnique Fédérale de Lausanne (EPFL))

  • J. D. Major

    (University of Liverpool)

Abstract

Evidence from cross-sectional electron microscopy has previously shown that Se passivates defects in CdSexTe1−x solar cells, and that this is the reason for better lifetimes and voltages in these devices. Here, we utilise spatially resolved photoluminescence measurements of CdSexTe1−x thin films on glass to directly study the effects of Se on carrier recombination in the material, isolated from the impact of conductive interfaces and without the need to prepare cross-sections through the samples. We find further evidence to support Se passivation of grain boundaries, but also identify an increase in below-bandgap photoluminescence that indicates the presence of Se-enhanced defects in grain interiors. Our results show that whilst Se treatment, in tandem with Cl passivation, does increase radiative efficiencies in CdSexTe1−x, it simultaneously increases the defect content within the grain interiors. This suggests that although it is beneficial overall, Se incorporation will still limit the maximum attainable optoelectronic properties of CdSexTe1−x thin films.

Suggested Citation

  • A. R. Bowman & J. F. Leaver & K. Frohna & S. D. Stranks & G. Tagliabue & J. D. Major, 2024. "Spatially resolved photoluminescence analysis of the role of Se in CdSexTe1−x thin films," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52889-z
    DOI: 10.1038/s41467-024-52889-z
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    References listed on IDEAS

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    1. Arthur Onno & Carey Reich & Siming Li & Adam Danielson & William Weigand & Alexandra Bothwell & Sachit Grover & Jeff Bailey & Gang Xiong & Darius Kuciauskas & Walajabad Sampath & Zachary C. Holman, 2022. "Understanding what limits the voltage of polycrystalline CdSeTe solar cells," Nature Energy, Nature, vol. 7(5), pages 400-408, May.
    2. K. Alberi & B. Fluegel & H. Moutinho & R. G. Dhere & J. V. Li & A. Mascarenhas, 2013. "Measuring long-range carrier diffusion across multiple grains in polycrystalline semiconductors by photoluminescence imaging," Nature Communications, Nature, vol. 4(1), pages 1-7, December.
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