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

## TL;DR

This study creates a new hybrid perovskite structure with quantum wires and dots that emit light in two different wavelength ranges, offering potential for optoelectronic devices.

## Contribution

A novel self-assembled 1D quantum wire bundle/quantum dot composite structure with multiband emission is developed.

## Key findings

- Quantum wires in bundles maintain single-crystal atomic arrangements with diameters up to 200 nm.
- Quantum dots are uniformly distributed within the wire structure and appear as <10 nm black dots.
- Photoluminescence shows distinct emission bands at 420–440 nm and 530–550 nm from the composite structure.

## Abstract

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.