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Copyright © 2020 American Chemical Society.Perovskite solar panels centered on multiple cations show excellent optoelectronic properties with a high power transformation efficiency. Herein, the structural, electric, and optical properties of mixed-cation mixed-metal perovskites MA1-x Cs x Pb0.25Sn0.75I3 had been studied by using the first-principles calculations the very first time. Our computed results reveal that these perovskite products possess direct band spaces within the variety of 1.0-1.