Compositional Gradient of Mixed Halide 2D Perovskite Interface Boosts Outdoor Stability of Highly Efficient Perovskite Solar Cells
Abstract Interface engineering using self‐assembled 2D perovskite interfaces is a consolidated route to efficient and durable perovskite solar cells. Whether the 2D perovskite forms a homogeneous conformal layer or is heterogeneously distributed on the surface, interface defects are passivated, leading to a general improvement in the device's open circuit voltage (V OC ) and stability. Here, an innovative strategy is developed for manipulating the composition of the 2D/3D perovskite interface that results in the formation of a gradient halide distribution, which extends from the surface to the bulk. The use of a bromide‐based 2D perovskite triggers a progressive Br/I exchange, affecting not only the surface but also the perovskite underneath. As a result, not only the device V OC improve, as expected, but also the photogenerated current is boosted, leading to a device efficiency of up to 24.4%. Such mixed halide gradient effectively passivates surface and bulk defects making the perovskite active layer more efficient and robust, as demonstrated by the superior device stability showing zero losses in performances upon 36 days (more than 800 h) test in outdoor conditions, those ones relevant for a marketable product.
Authors
- Kyle Frohna (ORCID: https://orcid.org/0000-0002-2259-6154)
- Tianyu Xu
- Matteo Degani (ORCID: https://orcid.org/0000-0001-7422-331X)
- Miguel Anaya (ORCID: https://orcid.org/0000-0002-0384-5338)
- Giulia Grancini (ORCID: https://orcid.org/0000-0001-8704-4222)
- Alessandro J. Mirabelli (ORCID: https://orcid.org/0000-0001-7101-4926)
- Masoud Karimipour (ORCID: https://orcid.org/0000-0002-6619-4798)
- Giovanni Pica (ORCID: https://orcid.org/0000-0003-1024-0342)
- Samuel D. Stranks (ORCID: https://orcid.org/0000-0002-8303-7292)
- Riccardo Pallotta (ORCID: https://orcid.org/0009-0007-6033-8280)
- Chang‐Qi Ma (ORCID: https://orcid.org/0000-0002-9293-5027)
- Mónica Lira Cantú
Institutions
- Chinese Academy of Sciences (CN)
- University of Cambridge (GB)
- University of Pavia (IT)
- Suzhou Institute of Nano-tech and Nano-bionics (CN)
- Institut Català de Nanociència i Nanotecnologia (ES)
- National Interuniversity Consortium of Materials Science and Technology (IT)
- Universidad de Sevilla (ES)
Publication Details
- Journal
- Advanced Energy Materials
- Published
- 2024-12-23
- DOI
- https://doi.org/10.1002/aenm.202404469
- Citations
- 10
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.09
Funders
- Diamond Light Source
- Dipartimenti di Eccellenza
- Royal Society
- European Commission
- Università degli Studi di Pavia
- Tata Sons
- Regione Lombardia
- Ministero dell'Università e della Ricerca
- Engineering and Physical Sciences Research Council
- European Research Council
- HORIZON EUROPE European Research Council