Reversible Transformation between CsPbBr₃ Perovskite Nanowires and Nanorods with Polarized Optoelectronic Properties

Abstract

CsPbX 3 (X = Cl, Br, I) perovskite nanowires and nanorods are important 1D and quasi 1D semiconductor nanomaterials. They have shown significant prospect in optic and optoelectronic applications, especially for their adaptability to flexible devices, good carrier transport performance, polarized absorption, and emission properties. Due to the high dependence of the property to the morphology, it is crucial to develop synthesis methods with continuous diameter and length tunability of the 1D/quasi 1D perovskites. In this report, a feasibly room temperature synthesis method was developed for ultrathin CsPbX 3 (X = Cl, Br, I) perovskite nanowires. By aging the CsPbBr 3 nanowires (≈2*500 nm) under ambient condition with proper concentration and time, the nanowires are transformed to nanorods with controllable diameter and length. Reversibly, the nanorods can be transformed back to nanowires. Equilibrium mechanism is adopted to understand the morphology evolution, and hopefully could be generally applied to many other nano materials. The polarized optoelectronic properties of the nanowires and nanorods are interpreted by a model based on the two-channel anisotropies measurement. Polarized light detectors constructed by oriented assembled nanowires are fabricated to demonstrate their application potentials.

CsPbBr3:Mn Nanowires: d-d Transfer of Mn Ions for Bright White Emitting Diodes

“…In recent years, numerous methods, such as heat injection, ligand replication and reprecipitation, spin coating, microemulsion, as well as cutting-edge ultrasound, have been employed to prepare all-inorganic perovskite nanomaterials. − Perovskite nanomaterials with different morphologies and sizes, such as zero-dimensional (0D) perovskite quantum dots, one-dimensional (1D) nanowires (NWs) or nanorods, , and two-dimensional (2D) nanoplates, have been devised and synthesized by regulating the experimental conditions, including temperature, reaction time, capping agents, ion ratios, and templates. Compared with 3D and 2D nanomaterials, 1D perovskite materials have a high specific surface area and powerful quantum confinement effect, thus enriching their unique optical and physical characteristics.…”

In situ, seed-free formation of a Ruddlesden–Popper perovskite Cs2PbI2Cl2 nanowires/PbI2 heterojunction for a high-responsivity, self-powered photodetector

“…1(e)), the coarsening of the Cs 2 PbI 2 Cl 2 nanowires seems to happen, probably via the Ostwald ripening mechanism. 37,38 Moreover, the surficial characteristics of the FTO/TiO 2 substrate, which can be clearly observed from Fig. S1 (ESI †), are identified from the sample prepared with 8 mg mL À1 CsCl/MeOH.…”

Studies of high-membered two-dimensional Ruddlesden–Popper Cs7Pb6I19 perovskite nanosheets via kinetically controlled reactions

“…10 Therefore, many different types of perovskite nanomaterials have been developed and classified based on composition, dimensionality, and phase. In terms of dimensionality, 0D quantum dots, 11,12 1D nanowires, [13][14][15] 2D nanosheets 6,[16][17][18][19][20][21] and 3D perovskite nanomaterials have been successfully fabricated and their intrinsic properties have been discussed deeply. Different dimensionalities of perovskite nanomaterials can be controlled by using suitable cosurfactants, solvents and synthesis temperatures.…”