Suppressed phase segregation for triple-junction perovskite solar cells

Zaiwei Wang, Lewei Zeng, Tong Zhu, Hao Chen, Bin Chen, Dominik J. Kubicki, Adam Balvanz, Chongwen Li, Aidan Maxwell, Esma Ugur, Roberto dos Reis, Matthew Cheng, Guang Yang, Biwas Subedi, Deying Luo, Juntao Hu, Junke Wang, Sam Teale, Suhas Mahesh, Sasa WangShuangyan Hu, Euidae Jung, Mingyang Wei, So Min Park, Luke Grater, Erkan Aydin, Zhaoning Song, Nikolas J. Podraza, Zhenghong Lu, Jinsong Huang, Vinayak P. Dravid, Stefaan De Wolf, Yanfa Yan, Michael Grätzel, Mercouri G. Kanatzidis, E. Sargent

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


The tunable band gaps and facile fabrication of perovskites make them attractive for multi-junction photovoltaics1,2. However, light-induced phase segregation limits their efficiency and stability3-5: 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 absorber2,6. 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.
Original languageEnglish (US)
StatePublished - Mar 28 2023

Bibliographical note

KAUST Repository Item: Exported on 2023-03-31
Acknowledged KAUST grant number(s): OSR-CRG2020-4350
Acknowledgements: This research was made possible by the US Department of the Navy, Office of Naval Research Grant (N00014-20-1-2572), the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office Award Number DE-EE0008753. This work was supported in part by the Ontario Research Fund-Research Excellence program (ORF7-Ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7). M.G.K. was supported by the Office of Naval Research (ONR) under grant N00014- 20-1-2725. At King Abdullah University of Science and Technology (KAUST), this work was supported by the under Award No. OSR-CRG2020-4350.2. This work was also supported by the Natural Sciences and Engineering Council of Canada and the Vanier Canada Graduate Scholarship. Z.W. acknowledges the Banting Postdoctoral Fellowships Program of Canada. D.J.K. acknowledges the support of the University of Warwick. The UK High-Field Solid-State NMR Facility used in this research was funded by EPSRC and BBSRC (EP/T015063/1), as well as the University of Warwick, including via part funding through Birmingham Science City Advanced Materials Projects 1 and 2 supported by Advantage West Midlands (AWM) and the European Regional Development Fund (ERDF). The crystallographic experiments made use of the IMSERC Crystallography and Physical Characterization facilities at Northwestern University, which received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-2025633), and Northwestern University. The purchase of the Ag-microsource used to collect both single and powder diffraction data was supported by the Major Research Instrumentation Program for the National Science Foundation under the award CHE-1920248. This work also made use of the EPIC facility at Northwestern University’s NUANCE Center, which has received support from the SHyNE Resource (NSF ECCS-2025633), the IIN, and Northwestern’s MRSEC program (NSF DMR-1720139). Computations were performed on the Niagara supercomputer at the SciNet HPC Consortium. SciNet is funded by the Canada Foundation for Innovation; the Government of Ontario; Ontario Research Fund Research Excellence; and the University of Toronto. A.B. was supported, in part, by a fellowship through the National Defense Science and Engineering Graduate (NDSEG) Fellowship Program, sponsored by the Air Force Research Laboratory (AFRL), the Office of Naval Research (ONR), and Army Research Office (ARO). We thank Dr. Tao Song for efficiency certification in NREL. Z.W. thanks Dr. Yicheng Zhao, Dr. Zhenyi Ni and Dr. Emre Yengel for discussion about LIPS. A.B. acknowledges Dr. Christos D. Malliakas for assistance with the single crystal measurements and important discussions. A.B. also thanks Dr. Abishek K. Iyler, Craig Laing, and Michael Quintero for discussions.

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