Efficient and stable inorganic perovskite solar cells enabled by a lead silicate glass layer

Abstract

Inorganic cesium lead triiodide perovskite (CsPbI₃) exhibits remarkable potential in photovoltaic applications due to its exemplary thermal stability. However, CsPbI₃ is extremely sensitive to moisture which hinders its practical application in stable and high-efficiency photovoltaic devices. Here we show an effective method to enhance water resistance of CsPbI₃via an ultrathin hydrophobic lead silicate (PbSiO₃) glass layer. The resulting CsPbI₃ inorganic perovskite solar cells achieved a remarkably efficiency of 20.59% under standard test conditions. More importantly, the unencapsulated devices possess outstanding moisture resilience and maintain about 92% of their initial efficiency even after being stored at 25 ± 5% relative humidity (RH) for 600 hours.