Halide homogenization for low energy loss in 2-eV-bandgap perovskites and increased efficiency in all-perovskite triple-junction solar cells

Junke Wang, Lewei Zeng, Dong Zhang, Aidan Maxwell, Hao Chen, Kunal Datta, Alessandro Caiazzo, Willemijn H. M. Remmerswaal, Nick R. M. Schipper, Zehua Chen, Kevin Ho, Akash Dasgupta, Gunnar Kusch, Riccardo Ollearo, Laura Bellini, Shuaifeng Hu, Zaiwei Wang, Chongwen Li, Sam Teale, Luke Grater, Bin Chen, Martijn M. Wienk, Rachel A. Oliver, Henry J. Snaith, René A. J. Janssen () and Edward H. Sargent ()
Additional contact information
Junke Wang: University of Toronto
Lewei Zeng: University of Toronto
Dong Zhang: Eindhoven University of Technology, partner of Solliance
Aidan Maxwell: University of Toronto
Hao Chen: University of Toronto
Kunal Datta: Eindhoven University of Technology, partner of Solliance
Alessandro Caiazzo: Eindhoven University of Technology, partner of Solliance
Willemijn H. M. Remmerswaal: Eindhoven University of Technology, partner of Solliance
Nick R. M. Schipper: Eindhoven University of Technology, partner of Solliance
Zehua Chen: Eindhoven University of Technology
Kevin Ho: University of Washington
Akash Dasgupta: University of Oxford
Gunnar Kusch: University of Cambridge
Riccardo Ollearo: Eindhoven University of Technology, partner of Solliance
Laura Bellini: Eindhoven University of Technology, partner of Solliance
Shuaifeng Hu: University of Oxford
Zaiwei Wang: University of Toronto
Chongwen Li: University of Toronto
Sam Teale: University of Toronto
Luke Grater: University of Toronto
Bin Chen: University of Toronto
Martijn M. Wienk: Eindhoven University of Technology, partner of Solliance
Rachel A. Oliver: University of Cambridge
Henry J. Snaith: University of Oxford
René A. J. Janssen: Eindhoven University of Technology, partner of Solliance
Edward H. Sargent: University of Toronto

Nature Energy, 2024, vol. 9, issue 1, 70-80

Abstract: Abstract Monolithic all-perovskite triple-junction solar cells have the potential to deliver power conversion efficiencies beyond those of state-of-art double-junction tandems and well beyond the detailed-balance limit for single junctions. Today, however, their performance is limited by large deficits in open-circuit voltage and unfulfilled potential in both short-circuit current density and fill factor in the wide-bandgap perovskite sub cell. Here we find that halide heterogeneity—present even immediately following materials synthesis—plays a key role in interfacial non-radiative recombination and collection efficiency losses under prolonged illumination for Br-rich perovskites. We find that a diammonium halide salt, propane-1,3-diammonium iodide, introduced during film fabrication, improves halide homogenization in Br-rich perovskites, leading to enhanced operating stability and a record open-circuit voltage of 1.44 V in an inverted (p–i–n) device; ~86% of the detailed-balance limit for a bandgap of 1.97 eV. The efficient wide-bandgap sub cell enables the fabrication of monolithic all-perovskite triple-junction solar cells with an open-circuit voltage of 3.33 V and a champion PCE of 25.1% (23.87% certified quasi-steady-state efficiency).

Date: 2024
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DOI: 10.1038/s41560-023-01406-5

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