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Disentangling degradation pathways of narrow bandgap lead-tin perovskite material and photovoltaic devices

Author

Listed:
  • Florine M. Rombach

    (Parks Road)

  • Akash Dasgupta

    (Parks Road)

  • Manuel Kober-Czerny

    (Parks Road)

  • Heon Jin

    (Parks Road)

  • James M. Ball

    (Parks Road)

  • Joel A. Smith

    (Parks Road)

  • Michael D. Farrar

    (Parks Road)

  • Henry J. Snaith

    (Parks Road)

Abstract

Narrow bandgap lead-tin perovskites are essential components of next-generation all-perovskite multi-junction solar cells. However, their poor stability under operating conditions hinders successful implementation. In this work, we systematically investigate the underlying mechanisms of this instability under combined heat and light stress (ISOS L-2 conditions) by measuring changes in phase, conductivity, recombination and current-voltage characteristics. We find an increased impact of the redistribution of mobile ions during device operation to be the primary driver of performance loss during stressing, with further losses caused by a slower increase in non-radiative recombination and background hole density. Crucially, the dominant degradation mode changes with different hole transport materials, which we attribute to variations in iodine vacancy generation rates. By quantifying the impact of these mechanisms on device performance, we provide critical insights for improving the operational stability of lead-tin perovskite solar cells.

Suggested Citation

  • Florine M. Rombach & Akash Dasgupta & Manuel Kober-Czerny & Heon Jin & James M. Ball & Joel A. Smith & Michael D. Farrar & Henry J. Snaith, 2025. "Disentangling degradation pathways of narrow bandgap lead-tin perovskite material and photovoltaic devices," Nature Communications, Nature, vol. 16(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-58489-9
    DOI: 10.1038/s41467-025-58489-9
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