Strain-induced rubidium incorporation into wide-bandgap perovskites reduces photovoltage loss
A-site cation mixing can enhance the photovoltaic performance of a wide-bandgap (WBG) perovskite, but rubidium (Rb) cation mixing generally forms a nonperovskite phase. We report that lattice strain locks Rb ions into the α-phase of the lattice of a triple-halide WBG perovskite, preventing phase segregation into a nonperovskite Rb-cesium-rich phase. This process cooperates with chloride accommodation and promotes halide homogenization across the entire film volume. The resulting 1.67-electron volt WBG perovskite exhibits photoluminescence quantum yields exceeding 14% under 1-sun-equivalent irradiation, corresponding to a quasi-Fermi level splitting of ~1.34 electron volts. A WBG perovskite solar cell with an open-circuit voltage (<i>V</i><sub>OC</sub>) of 1.30 volts was prepared, corresponding to 93.5% of the radiative <i>V</i><sub>OC</sub> limit and representing the lowest photovoltage loss relative to the theoretical limit observed in WBG perovskites.
Authors
- Lukas Pfeifer (ORCID: https://orcid.org/0000-0002-8461-3909)
- Nikolaos Lempesis (ORCID: https://orcid.org/0000-0002-4104-9666)
- Michael A. Hope (ORCID: https://orcid.org/0000-0002-4742-9336)
- Lorenzo Agosta (ORCID: https://orcid.org/0000-0002-9778-5275)
- Michael Gräetzel (ORCID: https://orcid.org/0000-0002-0068-0195)
- Shaik M. Zakeeruddin (ORCID: https://orcid.org/0000-0003-0655-4744)
- Lyndon Emsley (ORCID: https://orcid.org/0000-0003-1360-2572)
- Mounir Mensi (ORCID: https://orcid.org/0009-0004-5319-1792)
- Likai Zheng (ORCID: https://orcid.org/0000-0003-3052-3868)
- Mingyang Wei (ORCID: https://orcid.org/0000-0003-4820-2210)
- Virginia Carnevali (ORCID: https://orcid.org/0000-0002-8905-2928)
- Yuxuan Zhang (ORCID: https://orcid.org/0009-0001-2269-4846)
- Pascal Schouwink
- Vladislav Sláma (ORCID: https://orcid.org/0000-0001-7339-5523)
- Felix T. Eickemeyer (ORCID: https://orcid.org/0000-0003-0855-9944)
- Jing Gao (ORCID: https://orcid.org/0000-0003-0120-5609)
- Ursula Röthlisberger (ORCID: https://orcid.org/0000-0002-1704-8591)
- David Wenhua Bi (ORCID: https://orcid.org/0000-0003-2250-8967)
- Yimin Xuan (ORCID: https://orcid.org/0000-0001-8347-3855)
- Ummugulsum Gunes (ORCID: https://orcid.org/0000-0002-8621-1647)
- Bin Huang (ORCID: https://orcid.org/0000-0002-7738-3455)
- Francesco Biasoni
Institutions
- National University of Singapore (SG)
- HES-SO University of Applied Sciences and Arts Western Switzerland (CH)
- Resonance Research (United States) (US)
- École Polytechnique Fédérale de Lausanne (CH)
- Politecnico di Milano (IT)
- Nanjing University of Aeronautics and Astronautics (CN)
Publication Details
- Journal
- Science
- Published
- 2025-04-04
- DOI
- https://doi.org/10.1126/science.adt3417
- Citations
- 62
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 45.29