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Revealing defective interfaces in perovskite solar cells from highly sensitive sub-bandgap photocurrent spectroscopy using optical cavities

Author

Listed:
  • Bas T. Gorkom

    (Eindhoven University of Technology)

  • Tom P. A. Pol

    (Eindhoven University of Technology)

  • Kunal Datta

    (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

Defects in perovskite solar cells are known to affect the performance, but their precise nature, location, and role remain to be firmly established. Here, we present highly sensitive measurements of the sub-bandgap photocurrent to investigate defect states in perovskite solar cells. At least two defect states can be identified in p-i-n perovskite solar cells that employ a polytriarylamine hole transport layer and a fullerene electron transport layer. By comparing devices with opaque and semi-transparent back contacts, we demonstrate the large effect of optical interference on the magnitude and peak position in the sub-bandgap external quantum efficiency (EQE) in perovskite solar cells. Optical simulations reveal that defects localized near the interfaces are responsible for the measured photocurrents. Using optical spacers of different lengths and a mirror on top of a semi-transparent device, allows for the precise manipulation of the optical interference. By comparing experimental and simulated EQE spectra, we show that sub-bandgap defects in p-i-n devices are located near the perovskite-fullerene interface.

Suggested Citation

  • Bas T. Gorkom & Tom P. A. Pol & Kunal Datta & Martijn M. Wienk & René A. J. Janssen, 2022. "Revealing defective interfaces in perovskite solar cells from highly sensitive sub-bandgap photocurrent spectroscopy using optical cavities," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-021-27560-6
    DOI: 10.1038/s41467-021-27560-6
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    1. Michele Saba & Michele Cadelano & Daniela Marongiu & Feipeng Chen & Valerio Sarritzu & Nicola Sestu & Cristiana Figus & Mauro Aresti & Roberto Piras & Alessandra Geddo Lehmann & Carla Cannas & Anna Mu, 2014. "Correlated electron–hole plasma in organometal perovskites," Nature Communications, Nature, vol. 5(1), pages 1-10, December.
    2. Nam Joong Jeon & Jun Hong Noh & Woon Seok Yang & Young Chan Kim & Seungchan Ryu & Jangwon Seo & Sang Il Seok, 2015. "Compositional engineering of perovskite materials for high-performance solar cells," Nature, Nature, vol. 517(7535), pages 476-480, January.
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    1. 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.

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