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In page Perovskite solar cell:

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As of 2021, the recorded peak power conversion efficiency has been found to be 25.6% efficiency. This was done using a formamidinium lead iodide metal-halide perovskite. Anions were pumped into existing highly efficient perovskites, and functioned to fill in gaps caused by trapped holes in the PV cell. Furthermore, this cell was found to be stable up to 450 hours, which is considered long-term stability. Finally, this device served to prove that anions other than iodine and bromine ions are capable of being bombarded into gaps in PV cells, breaking a trend that was evidently hindering prior research [198].[citation needed]