Facile synthesis of a dual-phase CsPbBr₃–CsPb₂Br₅ single crystal and its photoelectric performance

Abstract

Dual-phase CsPbBr3–CsPb2Br5 single crystal microsheets were synthesized by a simple method based on the coffee ring effect.

Assembling an Affinal 0D CsPbBr3/2D CsPb2Br5 Architecture by Synchronously In Situ Growing CsPbBr3 QDs and CsPb2Br5 Nanosheets: Enhanced Activity and Reusability for Photocatalytic CO2 Reduction

“…Such assembled materials are bound to contribute to the extra structure stability by strong interactions between the abundantly shared active atoms. 44 (3) As reported, by tuning the bromine chemical constitution and quantum confinement size to tailor the redox potential levels, CO 2 conversion may give an ideal selective product. 48,49 Remarkably, the constitution of bromine in the composite is easily controlled by monitoring the composition ratio of CsPbBr 3 and CsPb 2 Br 5 .…”

“…It is reported that in the presence of excess PbBr 2 , CsPbBr 3 could rearrange to form CsPb 2 Br 5 with a nonstoichiometric material transformation. , Thus, the consubstantial CsPbBr 3 QDs and CsPb 2 Br 5 nanosheets are expected to be synthesized in situ using a simple one-step hot-injection method with PbBr 2 as a scissor. Such assembled materials are bound to contribute to the extra structure stability by strong interactions between the abundantly shared active atoms . (3) As reported, by tuning the bromine chemical constitution and quantum confinement size to tailor the redox potential levels, CO 2 conversion may give an ideal selective product. , Remarkably, the constitution of bromine in the composite is easily controlled by monitoring the composition ratio of CsPbBr 3 and CsPb 2 Br 5 .…”

“…PQDs are incorporated onto (or into) graphene oxide nanosheets, MoS 2 , SnS 2 , zeolitic imidazolate frameworks (ZIFs), Pd nanosheets, g-C 3 N 4 , black phosphorus nanosheets, and MXene nanosheets, which are successful examples for efficiently promoting the conversion rate and significantly enhancing the reusable stability. Reviewing all these investigations, we are convinced that by constructing more coshared atoms between component materials, the carrier lifetime can be effectively prolonged as well as PQD stability can be improved through a strong interaction between PQDs and the host . Herein, we have introduced affinal CsPbBr 3 QDs and CsPb 2 Br 5 nanosheets to design a latest model photocatalyst.…”

“…Reviewing all these investigations, we are convinced that by constructing more coshared atoms between component materials, the carrier lifetime can be effectively prolonged as well as PQD stability can be improved through a strong interaction between PQDs and the host. 44 Herein, we have introduced affinal CsPbBr 3 QDs and CsPb 2 Br 5 nanosheets to design a latest model photocatalyst. Our strategy is primarily based on the following critical considerations: (1) CsPbBr 3 QDs and CsPb 2 Br 5 nanosheets have confined nano-sized morphologies that endow them with unique features, such as the maximum atom efficiency, rich surface-binding sites, and multidimensional channels for electron transport.…”

Synthesis of Two-Dimensional CsPb2X5 (X = Br and I) with a Stable Structure and Tunable Bandgap by CsPbX3 Phase Separation

“…Halide perovskites, possessing flexible lattices and exceptional optoelectronic properties, have achieved remarkable performance in the applications of solar cells, photodetectors, and light-emitting diodes (LEDs) but still suffer from problems, like the instability of ionic lattices. − Two-dimensional (2D) inorganic CsPb 2 X 5 , as a derivative of CsPbX 3 perovskite, has attracted increasing attention owing to its unique optical properties and quantum confinement effects. − They exhibit higher stability against moisture in an air environment, which benefits from the intrinsic structure with a layered arrangement of Pb–X polyhedron and Cs + . Research of the fundamental structure–property correlation of CsPb 2 X 5 could bring out the design inspiration of novel materials.…”