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 Reis, Matthew Cheng, Guang Yang, Biwas Subedi, Deying Luo, Juntao Hu, Junke Wang, Sam Teale, Suhas Mahesh, Sasa Wang, Shuangyan Hu, Eui Dae Jung, Mingyang Wei, So Min Park, Luke Grater, Erkan Aydin, Zhaoning Song, Nikolas J. Podraza, Zheng-Hong Lu, Jinsong Huang, Vinayak P. Dravid, Stefaan De Wolf, Yanfa Yan, Michael Grätzel, Merx G. Kanatzidis and Edward H. Sargent ()
Additional contact information
Zaiwei Wang: University of Toronto
Lewei Zeng: University of Toronto
Tong Zhu: University of Toronto
Hao Chen: University of Toronto
Bin Chen: University of Toronto
Dominik J. Kubicki: University of Warwick
Adam Balvanz: Northwestern University
Chongwen Li: University of Toronto
Aidan Maxwell: University of Toronto
Esma Ugur: King Abdullah University of Science and Technology (KAUST)
Roberto Reis: Northwestern University
Matthew Cheng: Northwestern University
Guang Yang: University of North Carolina at Chapel Hill
Biwas Subedi: The University of Toledo
Deying Luo: University of Toronto
Juntao Hu: Yunnan University
Junke Wang: University of Toronto
Sam Teale: University of Toronto
Suhas Mahesh: University of Toronto
Sasa Wang: University of Toronto
Shuangyan Hu: University of Toronto
Eui Dae Jung: University of Toronto
Mingyang Wei: University of Toronto
So Min Park: University of Toronto
Luke Grater: University of Toronto
Erkan Aydin: King Abdullah University of Science and Technology (KAUST)
Zhaoning Song: The University of Toledo
Nikolas J. Podraza: The University of Toledo
Zheng-Hong Lu: University of Toronto
Jinsong Huang: University of North Carolina at Chapel Hill
Vinayak P. Dravid: Northwestern University
Stefaan De Wolf: King Abdullah University of Science and Technology (KAUST)
Yanfa Yan: The University of Toledo
Michael Grätzel: Ecole Polytechnique Fedérale de Lausanne (EPFL)
Merx G. Kanatzidis: Northwestern University
Edward H. Sargent: University of Toronto

Nature, 2023, vol. 618, issue 7963, 74-79

Abstract: Abstract The tunable bandgaps 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-bandgap (>1.65 electron volts) iodide/bromide mixed perovskite absorbers, and becomes even more acute in the top cells of triple-junction solar photovoltaics that require a fully 2.0-electron-volt bandgap absorber2,6. Here we report that lattice distortion in iodide/bromide 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 the A-site cation and iodide. Using an approximately 2.0-electron-volt rubidium/caesium 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 per cent (23.3 per cent certified quasi-steady-state efficiency) with an open-circuit voltage of 3.21 volts. This is, to our knowledge, the first reported certified efficiency for perovskite-based triple-junction solar cells. The triple-junction devices retain 80 per cent of their initial efficiency following 420 hours of operation at the maximum power point.

Date: 2023
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DOI: 10.1038/s41586-023-06006-7

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