One-pot synthesis of heterostructured CsPbBr₃/PdSe nanowires with excellent humidity stability

Lead halide perovskite nanowires (NWs) have garnered increasing attention owing to their unique properties, including axial carrier transportation, low pumping thresholds, and polarized emission. However, their intrinsic instability significantly limits their applications. In this study, heterostructured CsPbBr₃/PbSe NWs with a diameter of 10 nm and lengths ranging from several to tens of microns were successfully synthesized via a one-pot solution-phase process. Photoluminescence measurements revealed that the CsPbBr₃/PbSe NWs emitted green fluorescence with a narrow width of 16 nm and a high photoluminescence quantum yield (PLQY) of 37.6%. The obtained CsPbBr₃/PbSe NWs underwent anion exchange with I^- ion precursors to transform into CsPbBr_3-I/PbSe, but not with Cl^- ion precursors. Remarkably, these heterostructured CsPbBr₃/PbSe NWs remained stable when immersed in water or exposed to air for several months, demonstrating excellent humidity stability. This study offers an effective approach for preparing stable CsPbBr₃ NWs and fosters their future applications in optoelectronic devices.