Solution-phase synthesis of rubidium lead iodide orthorhombic perovskite nanowires

Recently, metal halide perovskite nanocrystals have demonstrated outstanding properties in various optoelectronic applications. Cesium lead halides (CsPbX₃) are the most studied perovskites in nanoscale dimensions. However, halide perovskite nanocrystals with other cations have rarely been reported. It is important to develop new perovskite compositions to further expand their application in various fields. In this paper, we first report the synthesis of colloidal rubidium lead iodide (RbPbI₃) nanowires (NWs). RbPbI₃ NWs have an orthorhombic crystal structure and are single-crystalline in nature. The diameter of the NWs is around 32 nm with lengths up to several tens of micrometers. RbPbI₃ NWs absorb strongly below 450 nm. RbPbI₃ devices exhibited good photoresponsive behavior, suggesting a potential use in optoelectronics.