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Effect of sub-bandgap defects on radiative and non-radiative open-circuit voltage losses in perovskite solar cells

Author

Listed:
  • Guus J. W. Aalbers

    (Eindhoven University of Technology)

  • Tom P. A. Pol

    (Eindhoven University of Technology)

  • Kunal Datta

    (Eindhoven University of Technology)

  • Willemijn H. M. Remmerswaal

    (Eindhoven University of Technology)

  • Martijn M. Wienk

    (Eindhoven University of Technology)

  • René A. J. Janssen

    (Eindhoven University of Technology
    Dutch Institute for Fundamental Energy Research)

Abstract

The efficiency of perovskite solar cells is affected by open-circuit voltage losses due to radiative and non-radiative charge recombination. When estimated using sensitive photocurrent measurements that cover the above- and sub-bandgap regions, the radiative open-circuit voltage is often unphysically low. Here we report sensitive photocurrent and electroluminescence spectroscopy to probe radiative recombination at sub-bandgap defects in wide-bandgap mixed-halide lead perovskite solar cells. The radiative ideality factor associated with the optical transitions increases from 1, above and near the bandgap edge, to ~2 at mid-bandgap. Such photon energy-dependent ideality factor corresponds to a many-diode model. The radiative open-circuit voltage limit derived from this many-diode model enables differentiating between radiative and non-radiative voltage losses. The latter are deconvoluted into contributions from the bulk and interfaces via determining the quasi-Fermi level splitting. The experiments show that while sub-bandgap defects do not contribute to radiative voltage loss, they do affect non-radiative voltage losses.

Suggested Citation

  • Guus J. W. Aalbers & Tom P. A. Pol & Kunal Datta & Willemijn H. M. Remmerswaal & Martijn M. Wienk & René A. J. Janssen, 2024. "Effect of sub-bandgap defects on radiative and non-radiative open-circuit voltage losses in perovskite solar cells," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45512-8
    DOI: 10.1038/s41467-024-45512-8
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    References listed on IDEAS

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