Wide-bandgap (WBG) mixed-halide perovskites show promise of realizing efficient tandem solar cells but at present suffer from large open-circuit voltage loss and the mechanism is still unclear. Here we show that WBG perovskites with iodide–bromide compositions have an increased concentration of deep traps induced by iodide interstitials, which limits performance of WBG perovskite cells. We employ tribromide ions to suppress the iodide interstitial formation and thus reduce charge recombination in bladed WBG perovskite films of Cs0.1FA0.2MA0.7Pb(I0.85Br0.15)3. The 1-µm-thick opaque WBG perovskite solar cells have an efficiency of 21.9%, a small open-circuit voltage deficit of 0.40 V and a large fill factor of 83%. The efficiency of the best-performing monolithic perovskite–silicon tandem cell using this perovskite reaches 28.6%. The tribromide addition also suppresses light-induced phase segregation in WBG perovskites and thus enhance device stability. Encapsulated tandem cells maintain 93% of their initial efficiency after operation for 550 h.
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This work was supported by the Solar Energy Technologies office within the US Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, under award no. DE-EE0008749. This work was authored in part by the National Renewable Energy Laboratory, operated by Alliance for Sustainable Energy, LLC, for the US Department of Energy under contract no. DE-AC36-08GO28308. The views expressed in the article do not necessarily represent the views of the DOE or the US Government.
The authors declare no competing interests.
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Yang, G., Ni, Z., Yu, Z.J. et al. Defect engineering in wide-bandgap perovskites for efficient perovskite–silicon tandem solar cells. Nat. Photon. 16, 588–594 (2022). https://doi.org/10.1038/s41566-022-01033-8