Self-Assembled Hybrid Halide Perovskite Quantum Wire Bundle/Dot for Multiband Applications

In this study, self-assembled halide perovskite quantum wire bundles (QWBs)/quantum dots (QDs) are fabricated using a room temperature-based formation method. The one-dimensional (1D) perovskite-based QWB structures incorporate zero-dimensional QDs within a composite quantum structure. Transmission electron microscopy reveals that quantum wires with diameters ranging from tens of nanometers to approximately 200 nm maintain a single-crystal atomic arrangement in a bundle form. Conversely, QDs are uniformly distributed within the single-phase wire and appear as black dots < 10 nm. Photoluminescence analysis identifies the multiband characteristics of the emissions. The 420-440 nm band is attributed to 1D QWB, whereas the peak appearing in the 530-550 nm range corresponds to lead halide PbBr₂ QDs. Thus, the proposed self-assembled 1D QWB/QD composite structure exhibits novel multiband physical properties in the 420-440 and 530-550 nm bands; it offers new opportunities for designing materials with potential applications in optoelectronic devices.