Ion-induced field screening as a dominant factor in perovskite solar cell operational stability

Jarla Thiesbrummel, Sahil Shah, Emilio Gutierrez-Partida, Fengshuo Zu, Francisco Peña-Camargo, Stefan Zeiske, Jonas Diekmann, Fangyuan Ye, Karol P. Peters, Kai O. Brinkmann, Pietro Caprioglio, Akash Dasgupta, Seongrok Seo, Fatai A. Adeleye, Jonathan Warby, Quentin Jeangros, Felix Lang, Shuo Zhang, Steve Albrecht, Thomas Riedl, Ardalan Armin, Dieter Neher, Norbert Koch, Yongzhen Wu, Vincent M. Corre, Henry Snaith and Martin Stolterfoht ()
Additional contact information
Jarla Thiesbrummel: Universität Potsdam
Sahil Shah: Universität Potsdam
Emilio Gutierrez-Partida: Universität Potsdam
Fengshuo Zu: Humboldt-Universität zu Berlin
Francisco Peña-Camargo: Universität Potsdam
Stefan Zeiske: Swansea University
Jonas Diekmann: Universität Potsdam
Fangyuan Ye: Universität Potsdam
Karol P. Peters: Universität Potsdam
Kai O. Brinkmann: University of Wuppertal
Pietro Caprioglio: University of Oxford
Akash Dasgupta: University of Oxford
Seongrok Seo: University of Oxford
Fatai A. Adeleye: Universität Potsdam
Jonathan Warby: Universität Potsdam
Quentin Jeangros: Centre Suisse d′Électronique et de Microtechnique
Felix Lang: Universität Potsdam
Shuo Zhang: East China University of Science and Technology
Steve Albrecht: Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Thomas Riedl: University of Wuppertal
Ardalan Armin: Swansea University
Dieter Neher: Universität Potsdam
Norbert Koch: Humboldt-Universität zu Berlin
Yongzhen Wu: East China University of Science and Technology
Vincent M. Corre: Friedrich-Alexander-Universität Erlangen-Nürnberg
Henry Snaith: University of Oxford
Martin Stolterfoht: Universität Potsdam

Nature Energy, 2024, vol. 9, issue 6, 664-676

Abstract: Abstract The presence of mobile ions in metal halide perovskites has been shown to adversely affect the intrinsic stability of perovskite solar cells (PSCs). However, the actual contribution of mobile ions to the total degradation loss compared with other factors such as trap-assisted recombination remains poorly understood. Here we reveal that mobile ion-induced internal field screening is the dominant factor in the degradation of PSCs under operational conditions. The increased field screening leads to a decrease in the steady-state efficiency, often owing to a large reduction in the current density. Instead, the efficiency at high scan speeds (>1,000 V s−1), where the ions are immobilized, is much less affected. We also show that the bulk and interface quality do not degrade upon ageing, yet the open-circuit voltage decreases owing to an increase in the mobile ion density. This work reveals the importance of ionic losses for intrinsic PSC degradation before chemical or extrinsic mechanical effects manifest.

Date: 2024
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DOI: 10.1038/s41560-024-01487-w

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