A facile method to synthesize two-dimensional CsPb2Br5 nano-/micro-sheets for high-performance solution-processed photodetectors

Zhi, Ruonan; Hu, Jinming; Yang, Shengyi; Veeramalai, Chandrasekar Perumal; Zhang, Zhenheng; Saleem, Muhammad Imran; Sulaman, Muhammad; Tang, Yi; Zou, B. S.

doi:10.1016/j.jallcom.2020.153970

Cited by 22 publications

(10 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absorption edge of the former peak corresponds to the energy gap of 3.709 eV, while the latter one contributes to the 3.36 eV energy gap. In addition, a clear absorption peak at 515 nm is observed, resulting in the energy gap of 2.309 eV, which is in accordance with the previously reported optical characteristics of CsPb 2 Br 5 . ,, The electronic band structure of CsPb 2 Br 5 was investigated using first-principles calculations. Figure S7c–f shows the detailed calculation results.…”

Section: Results and Discussionmentioning

confidence: 99%

All-Inorganic Perovskite CsPb₂Br₅ Nanosheets for Photodetector Application Based on Rapid Growth in Aqueous Phase

Wang

Zhao

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

All-inorganic cesium lead-halide perovskites exhibit a great development prospect in optoelectronic devices owing to their stability and remarkable optoelectronic properties. Herein, we investigate the solution-processed synthesis of perovskite CsPb2Br5 nanosheets by using aqueous and ethanol as solvents. The results show that the aqueous environment ensures the phase formation of CsPb2Br5 and that the supersaturated solution in ethanol boosts nucleation of the nanosheets. The substrate temperature is the key factor for the evolution of morphology and the variation of the thickness of CsPb2Br5 nanosheets. Lower substrate temperature (<35 °C) is conducive to the formation of evenly distributed nanosheets with less stacking. The spatial and time-resolved fluorescence spectra indicate the heterogeneity of the defect density and the recombination process in different nanosheet regions. The photodetector based on the prepared CsPb2Br5 nanosheet displays an excellent switching current ratio (9 × 102), a short rise and decay time (43 and 83 ms, respectively), and good stability (75% of the initial current after 90 days in air). In addition, the mechanical stability and flexibility of the photodetector on the flexible substrate are investigated for 500 bending cycles.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

All-Inorganic Perovskite CsPb₂Br₅ Nanosheets for Photodetector Application Based on Rapid Growth in Aqueous Phase

Wang

Zhao

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…[ 95 ] In the production of CsPb 2 X 5 , the CsX/PbX 2 ratio could be one of 1:10, [ 96 ] 1:5, [ 88 ] 1:3, [ 59 ] 1:2.5, [ 67 ] 1:2, [ 97 ] 1:1. [ 98 ] From these ratios, it was likely that the successful synthesis of perovskites was empirical, which relied on trial‐and‐error and not the CsBr/PbBr 2 ratio. We herein introduce some basic established parameters to follow when determining the products, such as the which capping ligands and solvents to use.…”

Section: Direct Synthesis Of Low‐dimensional‐networked Perovskitesmentioning

confidence: 99%

“…Most notably, the rising and decay times were 180 and 130 ms, respectively. [ 98 ] It should be noted that the above‐mentioned CsPb 2 Br 5 was highly luminescent, which was an imperative prerequisite for their application in visible light detectors. If CsPb 2 Br 5 showed a wide bandgap, it could be used in a deep‐UV detector as it still displayed a high responsivity and fast response speed.…”

Section: Applicationsmentioning

confidence: 99%

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

et al. 2020

View full text Add to dashboard Cite

resistance against thermal-treatment compared to organic-inorganic hybrid lead halide perovskites (MAPbX 3 and FAPbX 3), due to the high thermal decomposition temperature of inorganic cations, thus drawing much attention. Owing to their impressive features, all-inorganic lead halide perovskites have been greatly useful in photovoltaic and optoelectronic applications, including solar cells, light-emitting diodes (LEDs), lasers, photodetectors and photocatalysis. [5-17] The conspicuous achievements in CsPbX 3 provoke the rapid development of its derivatives, Cs 4 PbX 6 and CsPb 2 X 5. These Cs x Pb y X z materials are composed of the same element compositions and [PbX 6 ] 4− unit cells. However, they possess completely different connectivity characters of [PbX 6 ] 4− octahedrons. CsPbX 3 is classified as a type of 3D perovskite, because [PbX 6 ] 4− octahedra are corner-shared along all three axes, while CsPb 2 X 5 has a sandwich-like arrangement with Cs + cations in between PbX 2 crystallographic planes, which can be regarded as a 2D phase. In Cs 4 PbX 6 , disconnected [PbBr 6 ] 4− octahedra are completely decoupled by Cs + cations. Among these three structures, CsPb 2 X 5 and Cs 4 PbX 6 , with dimensional-network less than 3 are referred to as lowdimensional-networked cesium lead halide perovskites. Besides the connectivity, these structures can be understood from a confinement perspective. CsPbX 3 is not confined in any dimension such that it can be considered as a 3D networked semiconductor. CsPb 2 X 5 and Cs 4 PbX 6 are confined in one dimension and all three dimensions, hence the name 2D and 0D structures, respectively. [18,19] In CsPb 2 X 5 and Cs 4 PbX 6 , the excitons cannot dissociate easily within all dimensions; instead, they are confined in the PbX 2 planes and individual [PbX 6 ] 4− units, respectively, resulting in larger bandgaps compared to the traditional ABX 3 phase. Figure 1 illustrates these three structures with different dimensions. Until now, comprehensive accounts of these Cs x Pb y X z materials have been made. However, most recent research focuses on CsPbX 3 , which has excellent optical properties and promising potential in various applications. Its derivatives, CsPb 2 X 5 and Cs 4 PbX 6 have achieved tremendous progress but are still far behind that of CsPbX 3. Many problems still seriously limit the rapid development of these low-dimensional-networked perovskites, a typical one being the debate on the origin of their luminescence. In this Review article, we focus on Cs 4 PbX 6 and CsPb 2 X 5 , and attempt to unveil their features, potential in All-inorganic cesium lead halide perovskites have emerged as promising optoelectronic materials with excellent photophysical properties and great potential in a variety of applications. In parallel with the most investigated CsPbX 3 , its derivates, Cs 4 PbX 6 and CsPb 2 X 5 , with low-dimensional-networked structures have also attracted great attention. In this review, recent advancements on the low-dimensional-networked cesium lead halide perovs...

show abstract

“…Wang’s team prepared a highly crystalline and pinhole-free CsPb 2 Br 5 –CsPbBr 3 perovskite film with an average particle size of approximately 1 μm by a simple continuous spinning method. Zou et al proposed a simple strategy to synthesize 2D CsPb 2 Br 5 nano/microchips at room temperature. Shao et al successfully designed and synthesized CsPb 2 Br 5 NCs encapsulated with mesoporous SiO 2 nanocomposite materials, showing high PL strength and high emission.…”

Section: Introductionmentioning

confidence: 99%

Highly Photoluminescent CsPbBr₃/CsPb₂Br₅ NCs@TEOS Nanocomposite in Light-Emitting Diodes

Zhou

Zhang

et al. 2021

Inorg. Chem.

View full text Add to dashboard Cite

All-inorganic halide perovskite (CsPb2Br5) nanocrystals (NCs) have received widespread attention owing to their unique photoelectric properties. This work reports a novel strategy to control the phase transition from CsPbBr3 to CsPb2Br5 and investigates the effects of different treatment times and treatment temperatures on perovskite NCs formation. By controlling the volume of tetraethoxysilane (TEOS) added, the formation of different phases of perovskite powder can be well controlled. In addition, a white light-emitting diode (WLED) device is designed by coupling the CsPbBr3/CsPbBr3–CsPb2Br5 NCs@TEOS nanocomposite and CaAlSiN3:Eu2+ commercial phosphor with a 460 nm InGaN blue chip, exhibiting a high luminous efficiency of 57.65 lm/W, color rendering index (CRI) of 91, and a low CCT of 5334 K. The CIE chromaticity coordinates are (0.3363, 0.3419). This work provides a new strategy for the synthesis of CsPbBr3/CsPbBr3–CsPb2Br5 NCs@TEOS nanocomposite, which can be applied to the field of WLEDs and display devices.

show abstract

A facile method to synthesize two-dimensional CsPb2Br5 nano-/micro-sheets for high-performance solution-processed photodetectors

Cited by 22 publications

References 46 publications

All-Inorganic Perovskite CsPb₂Br₅ Nanosheets for Photodetector Application Based on Rapid Growth in Aqueous Phase

All-Inorganic Perovskite CsPb₂Br₅ Nanosheets for Photodetector Application Based on Rapid Growth in Aqueous Phase

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Highly Photoluminescent CsPbBr₃/CsPb₂Br₅ NCs@TEOS Nanocomposite in Light-Emitting Diodes

Contact Info

Product

Resources

About

A facile method to synthesize two-dimensional CsPb2Br5 nano-/micro-sheets for high-performance solution-processed photodetectors

Cited by 22 publications

References 46 publications

All-Inorganic Perovskite CsPb2Br5 Nanosheets for Photodetector Application Based on Rapid Growth in Aqueous Phase

All-Inorganic Perovskite CsPb2Br5 Nanosheets for Photodetector Application Based on Rapid Growth in Aqueous Phase

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Highly Photoluminescent CsPbBr3/CsPb2Br5 NCs@TEOS Nanocomposite in Light-Emitting Diodes

Contact Info

Product

Resources

About

All-Inorganic Perovskite CsPb₂Br₅ Nanosheets for Photodetector Application Based on Rapid Growth in Aqueous Phase

All-Inorganic Perovskite CsPb₂Br₅ Nanosheets for Photodetector Application Based on Rapid Growth in Aqueous Phase

Highly Photoluminescent CsPbBr₃/CsPb₂Br₅ NCs@TEOS Nanocomposite in Light-Emitting Diodes