Photon Transport in One-Dimensional Incommensurately Epitaxial CsPbX₃ Arrays

Abstract

One-dimensional nanoscale epitaxial arrays serve as a great model in studying fundamental physics and for emerging applications. With an increasing focus laid on the Cs-based inorganic halide perovskite out of its outstanding material stability, we have applied vapor phase epitaxy to grow well aligned horizontal CsPbX (X: Cl, Br, or I or their mixed) nanowire arrays in large scale on mica substrate. The as-grown nanowire features a triangular prism morphology with typical length ranging from a few tens of micrometers to a few millimeters. Structural analysis reveals that the wire arrays follow the symmetry of mica substrate through incommensurate epitaxy, paving a way for a universally applicable method to grow a broad family of halide perovskite materials. The unique photon transport in the one-dimensional structure has been studied in the all-inorganic Cs-based perovskite wires via temperature dependent and spatially resolved photoluminescence. Epitaxy of well oriented wire arrays in halide perovskite would be a promising direction for enabling the circuit-level applications of halide perovskite in high-performance electro-optics and optoelectronics.

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

“…[81,82] The CVD method can achieve epitaxial growth of single-crystal CsPbX 3 (X = Cl, Br, I) nanowires on crystalline substrates. [81,82] However, the relatively higher reaction temperature and difficulty in engineering morphology hinder the CVD procedure in the preparation of perovskite NCs with various shapes, sizes and dimensions. [81,82] The widely used solution approaches offer an effective route for the fabrication of uniform perovskites NCs, including zero-dimensional QDs and nanocubes, one-dimensional nanowires and nanorods, and two-dimensional nanoplatelets and nanosheets.…”

“…[81,82] However, the relatively higher reaction temperature and difficulty in engineering morphology hinder the CVD procedure in the preparation of perovskite NCs with various shapes, sizes and dimensions. [81,82] The widely used solution approaches offer an effective route for the fabrication of uniform perovskites NCs, including zero-dimensional QDs and nanocubes, one-dimensional nanowires and nanorods, and two-dimensional nanoplatelets and nanosheets. In the following section, several representative procedures are briefly discussed: hot-injection route, RT ligand-mediated reprecipitation, RT supersaturated recrystallization process, dropletbased microfluidic technology, and solvothermal method ( Table 1 gives the comparison of various solution synthetic approaches).…”

Facile Two‐Step Synthesis of All‐Inorganic Perovskite CsPbX3 (X = Cl, Br, and I) Zeolite‐Y Composite Phosphors for Potential Backlight Display Application

“…[66] In Figure 5d,e, we investigate the decomposition of iodide-containing CsPb(Br 0.5 ,I 0.5 ) 3 -zeolite-Y composites stored as a dried powder and CsPb(Br 0.5 ,I 0.5 ) 3 QDs freely dispersed in hexane, which reveals itself as a blueshift of the emission. The emission from bare mixed bromide-iodide perovskite QDs has turned green (compare Figure S6b to Figure S9a in the Supporting Information), indicating phase separation into bromide and iodide phases [67,68] followed by further degradation of the iodide phase. Importantly, however, the blueshift is notably smaller for the embedded QDs (23 nm over 13 d) than for the bare QDs (28 nm over 6 d).…”

Self-Powered, Flexible, and Solution-Processable Perovskite Photodetector Based on Low-Cost Carbon Cloth

“…Recently, the design and fabrication of flexible photodetectors built on lightweight and bendable substrates have become a research hotspot because of their potential applications in large‐area foldable displays, wearable optoelectronic devices, and civil engineering. Bendable indium‐tin‐oxide (ITO)‐coated polyethylene terephthalate (PET) film, metal mesh, and even mica or graphene are widely employed as substrates to support semiconducting materials to achieve the flexibility of such devices . For example, Xie and co‐workers reported a flexible photodetector by directly depositing CH 3 NH 3 PbI 3 film on an ITO‐coated PET substrate .…”