Achieving high open-circuit voltage (V) for tin-based perovskite solar cells is challenging. Here, we demonstrate that a ZnS interfacial layer can improve the V and photovoltaic performance of formamidinium tin iodide (FASnI) perovskite solar cells. The TiO-ZnS electron transporting layer (ETL) with cascade conduction band structure can effectively reduce the interfacial charge recombination and facilitate electron transfer. Our best-performing FASnI perovskite solar cell using the cascaded TiO-ZnS ETL has achieved a power conversion efficiency of 5.27%, with a higher V of 0.380 V, a short-circuit current density of 23.09 mA cm, and a fill factor of 60.01%. The cascade structure is further validated with a TiO-CdS ETL. Our results suggest a new approach for further improving the performance of tin-based perovskite solar cells with a higher V.
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