KCS

The optical and electrical properties of Pb-based perovskites look almost perfect for solar cells. The latest efficiency of perovskite solar cells reached almost 25%, The presence of Pb, however, has caused some concerns due to the high perceived toxicity of Pb, which may slow down or even hinder the pace of commercialization. Therefore, the science community has been searching for lower-toxicity perovskite-type materials as a back-up strategy. Sn-based perovskites have attracted the most attention due to their very similar properties, and the most promising performance achieved by their devices. In this work, we synthesized single-crystalline CsPbBr₃ and CsSnBr₃ nanowires using chemical vapor transport method and compared the optical/electrical properties. We fabricated photodetectors using the individual nanowire, showing that the Sn composition significantly diminished the photocurrent and reduced the stability.