Regulating Interfacial Recombination in Cd‐Free Sb <sub>2</sub> Se <sub>3</sub> Solar Cells via an Ultrathin Al <sub>2</sub> O <sub>3</sub>
Antimony selenide (Sb 2 Se 3 ) has emerged as a promising photovoltaic absorber owing to its suitable bandgap, high absorption coefficient, and low‐toxicity elemental composition. However, high‐efficiency Sb 2 Se 3 solar cells commonly rely on CdS electron‐transport layers, whereas Cd‐free alternatives ofte...