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Enhanced optical path and electron diffusion length enable high-efficiency perovskite tandems

Author

Listed:
  • Bin Chen

    (University of Toronto)

  • Se-Woong Baek

    (University of Toronto)

  • Yi Hou

    (University of Toronto)

  • Erkan Aydin

    (King Abdullah University of Science and Technology (KAUST))

  • Michele De Bastiani

    (King Abdullah University of Science and Technology (KAUST))

  • Benjamin Scheffel

    (University of Toronto)

  • Andrew Proppe

    (University of Toronto)

  • Ziru Huang

    (University of Toronto)

  • Mingyang Wei

    (University of Toronto)

  • Ya-Kun Wang

    (University of Toronto)

  • Eui-Hyuk Jung

    (University of Toronto)

  • Thomas G. Allen

    (King Abdullah University of Science and Technology (KAUST))

  • Emmanuel Van Kerschaver

    (King Abdullah University of Science and Technology (KAUST))

  • F. Pelayo García de Arquer

    (University of Toronto)

  • Makhsud I. Saidaminov

    (University of Toronto)

  • Sjoerd Hoogland

    (University of Toronto)

  • Stefaan De Wolf

    (King Abdullah University of Science and Technology (KAUST))

  • Edward H. Sargent

    (University of Toronto)

Abstract

Tandem solar cells involving metal-halide perovskite subcells offer routes to power conversion efficiencies (PCEs) that exceed the single-junction limit; however, reported PCE values for tandems have so far lain below their potential due to inefficient photon harvesting. Here we increase the optical path length in perovskite films by preserving smooth morphology while increasing thickness using a method we term boosted solvent extraction. Carrier collection in these films – as made – is limited by an insufficient electron diffusion length; however, we further find that adding a Lewis base reduces the trap density and enhances the electron-diffusion length to 2.3 µm, enabling a 19% PCE for 1.63 eV semi-transparent perovskite cells having an average near-infrared transmittance of 85%. The perovskite top cell combined with solution-processed colloidal quantum dot:organic hybrid bottom cell leads to a PCE of 24%; while coupling the perovskite cell with a silicon bottom cell yields a PCE of 28.2%.

Suggested Citation

  • Bin Chen & Se-Woong Baek & Yi Hou & Erkan Aydin & Michele De Bastiani & Benjamin Scheffel & Andrew Proppe & Ziru Huang & Mingyang Wei & Ya-Kun Wang & Eui-Hyuk Jung & Thomas G. Allen & Emmanuel Van Ker, 2020. "Enhanced optical path and electron diffusion length enable high-efficiency perovskite tandems," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15077-3
    DOI: 10.1038/s41467-020-15077-3
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    Cited by:

    1. Khan, Firoz & Rezgui, Béchir Dridi & Khan, Mohd Taukeer & Al-Sulaiman, Fahad, 2022. "Perovskite-based tandem solar cells: Device architecture, stability, and economic perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 165(C).

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