Phase evolution and fluorescence stability of CsPb₂Br₅ microwires and their application in stable and sensitive photodetectors

Abstract

As a special two-dimensional layered perovskite material, CsPb2Br5 has attracted great attention with great stability and excellent photoelectric performance. Herein, a simple and environment-friendly two-step method was used to prepare...

Phase transition enhanced electromagnetic wave absorption in Cs(Pb,Fe,Co,Ni,Mn)Br3‐based high‐entropy compounds

“…In cubic CsPbBr 3 (Pm3m), the lattice constant a = b = c, each M 2+ ion is bonded to six Br − atoms, forming a cornersharing octahedral MBr 6 . 29 The M-Br bond lengths and angles of cubic CsPbBr 3 are highly symmetric with Cs ions occupy interstitial sites, resulting in a highly symmetrical structure. In orthorhombic CsPbBr 3 (space group Pnma), a rectangular unit cell with varying dimensions along each axis, leading to a≠b≠c.…”

“…Recently, the all-inorganic perovskite CsPbBr 3 has attracted much attention in fields like solar cells, LEDs, lasers, and photodetectors due to its potent light absorption, extensive carrier diffusion, robust photoluminescence, and easy processing properties. 29 Its well-balanced electron/hole mobility further positions it as a promising semiconductor for EMA. 30 In addition, CsPbBr 3 can undergo a transition between cubic, orthorhombic, and tetrahedral phases, among which the latter two phases show distortion in the lattice which is beneficial for EMA.…”

Nanometer-Thick CsPbBr3 Films with Embedded CsPb2Br5 Nanowires for Photodetector Applications

“…As a member of the Cs–Pb–Br family, the two-dimensional (2D) CsPb 2 Br 5 can be synthesized by directly dropping CsPbBr 3 powder into water. This process does not require any ligands or catalysts. , This method effectively avoids the issues of hindered ion charge transfer and surface defect formation caused by the use of organic ligands in previous studies. Additionally, the water-phase-synthesized CsPb 2 Br 5 exhibits good environmental stability, which is beneficial for the integrated application of nano-optoelectronic devices …”