Assessing the Influence of Illumination on Ion Conductivity in Perovskite Solar Cells
Whether illumination influences the ion conductivity in lead-halide perovskite solar cells containing iodide halides has been an ongoing debate. Experiments to elucidate the presence of a photoconductive effect require special devices or measurement techniques and neglect possible influences of the enhanced electronic charge concentrations. Here, we assess the electronic-ionic charge transport using drift-diffusion simulations and show that the well-known increase in capacitance at low frequencies under illumination is caused by electronic currents that are amplified due to the screening of the alternating electric field by the ions. We propose a novel characterization technique to detect a potential photoinduced increase in ionic conductivity based on capacitance measurements on fully integrated devices. The method is applied to a range of perovskite solar cells with different active layer materials. Remarkably, all measured samples show a clear signature of photoenhanced ion conductivity, posing fundamental questions on the underlying nature of the photosensitive mechanism.
Authors
- Aïcha Hessler‐Wyser (ORCID: https://orcid.org/0000-0003-1159-4193)
- Balthasar Blülle (ORCID: https://orcid.org/0000-0001-9982-1033)
- Christophe Ballif (ORCID: https://orcid.org/0000-0001-8989-0545)
- Wolfgang Tress (ORCID: https://orcid.org/0000-0002-4010-239X)
- Firouzeh Ebadi (ORCID: https://orcid.org/0000-0002-7374-4479)
- Sandra Jenatsch (ORCID: https://orcid.org/0000-0003-1311-9898)
- Andreas Schiller (ORCID: https://orcid.org/0000-0001-5261-933X)
- Christian M. Wolff (ORCID: https://orcid.org/0000-0002-7210-1869)
- Miguel A. Torre Cachafeiro (ORCID: https://orcid.org/0009-0004-6907-9826)
- Mostafa Othman (ORCID: https://orcid.org/0000-0001-6987-0176)
- Nasim Kabir (ORCID: https://orcid.org/0009-0000-4906-7044)
- Beat Ruhstaller
Institutions
- Fluxim (Switzerland) (CH)
- Sulzer (Switzerland) (CH)
- École Polytechnique Fédérale de Lausanne (CH)
- ZHAW Zurich University of Applied Sciences (CH)
Publication Details
- Journal
- The Journal of Physical Chemistry Letters
- Published
- 2024-11-03
- DOI
- https://doi.org/10.1021/acs.jpclett.4c02403
- Citations
- 12
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.50
Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Innosuisse - Schweizerische Agentur für Innovationsförderung
- HORIZON EUROPE Marie Sklodowska-Curie Actions
- HORIZON EUROPE European Research Council