Electrochemical and Spectro-Microscopic Analyses of Charge Accumulation and Ion Migration in Dry Processed Perovskite Solar Cells under Electrical Biasing
We study the influence of electrical biasing on the modification of the chemical composition and electrical performance of perovskite solar cells (PSCs) by coupling electrochemical impedance spectroscopy (EIS) and scanning transmission X-ray microscopy (STXM) techniques. EIS reveals the formation of charge accumulation at the interfaces and changes in the resistive and capacitive properties. STXM study on PSCs after applying a strong electric field for a long biasing time indicates the breakdown of methylammonium (MA<sup>+</sup>) cation, promoting iodide ions to migrate and create defects at the interface. This complementary EIS and STXM study allows the suggestion of a degradation mechanism that includes the migration of iodide ions that leads to interface defects and subsequent degradation of solar cell performance. In addition, we study the evolution of the performance of PSCs under air. We observe an increased hysteresis index on current-voltage curves and fill factor reduction of the perovskite solar cells with aging in air. EIS measurements show the formation of a capacitive layer resulting from the accumulation of iodide ions through modification of the mobile ion concentration and ion mobility.
Authors
- Denis Tondelier (ORCID: https://orcid.org/0000-0003-1065-1977)
- Bernard Geffroy (ORCID: https://orcid.org/0000-0001-8654-6140)
- Yvan Bonnassieux (ORCID: https://orcid.org/0000-0003-4413-2067)
- Pilar López-Varo (ORCID: https://orcid.org/0000-0002-2170-1581)
- Sufal Swaraj (ORCID: https://orcid.org/0000-0001-7351-2320)
- Ileana Florea (ORCID: https://orcid.org/0000-0002-2860-3992)
- Philip Schulz (ORCID: https://orcid.org/0000-0002-8177-0108)
- Haeyeon Jun (ORCID: https://orcid.org/0000-0003-3450-0225)
- Jean‐Éric Bourée
Institutions
- Centre National de la Recherche Scientifique (FR)
- École Polytechnique (FR)
- Université Côte d'Azur (FR)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- Synchrotron soleil (FR)
- Laboratoire de Physique des Interfaces et des Couches Minces (FR)
- CEA Paris-Saclay (FR)
Publication Details
- Journal
- The Journal of Physical Chemistry Letters
- Published
- 2025-01-16
- DOI
- https://doi.org/10.1021/acs.jpclett.4c02884
- Citations
- 1
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.73
Funders
- Agence Nationale de la Recherche