Suppressed phase segregation for triple-junction perovskite solar cells
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- University of Toledo, OH (United States)
- University of Toledo, OH (United States); Northwestern University, Evanston, IL (United States)
- University of Warwick, Coventry (United Kingdom)
- Northwestern University, Evanston, IL (United States)
- King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
- University of North Carolina at Chapel Hill, NC (United States)
- University of Toronto (Canada)
- Yunnan University, Kunming (China)
- University of Toledo, OH (United States); Ecole Polytechnique Fedérale de Lausanne (EPFL), Lausanne (Switzerland)
- University of Toronto (Canada); Yunnan University, Kunming (China)
- Ecole Polytechnique Fedérale de Lausanne (EPFL), Lausanne (Switzerland)
The tunable band gaps and facile fabrication of perovskites make them attractive for multi-junction photovoltaics. However, light-induced phase segregation limits their efficiency and stability: this occurs in wide band gap (> 1.65 eV) I/Br mixed perovskite absorbers, and becomes even more acute in the top cells of triple-junction solar photovoltaics that requires a fully 2.0 eV band gap absorber. We report herein that lattice distortion in I/Br mixed perovskites is correlated with the suppression of phase segregation, generating an increased ion migration energy barrier arising from the decreased average interatomic distance between A-site cation and iodide. Using a ~2.0 eV Rb/Cs mixed-cation inorganic perovskite with large lattice distortion in the top subcell, we fabricated all-perovskite triple-junction solar cells and achieved an efficiency of 24.3% (23.3% certified quasi-steady-state efficiency) with an open-circuit voltage of 3.21 V. This is, to our knowledge, the first reported certified efficiency for perovskite-based triple-junction solar cells. The triple-junction devices retain 80% of their initial efficiency following 420 hours of operation at the maximum power point.
- Research Organization:
- University of Toledo, OH (United States)
- Sponsoring Organization:
- King Abdullah University of Science and Technology (KAUST); Office of Naval Research (ONR); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
- Grant/Contract Number:
- EE0008753
- OSTI ID:
- 2478133
- Alternate ID(s):
- OSTI ID: 2418662
- Journal Information:
- Nature (London), Journal Name: Nature (London) Journal Issue: 7963 Vol. 618; ISSN 0028-0836
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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