Inter-Conversion between Different Compounds of Ternary Cs-Pb-Br System

Li, Jing; Zhang, Huijie; Wang, Song; Long, Debing; Li, Mingkai; Wang, Duofa; Zhang, Tianjin

doi:10.3390/ma11050717

Cited by 33 publications

(28 citation statements)

References 19 publications

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“…The most common example is the 3D → 0D (CsPbBr 3 → Cs 4 PbBr 6 ) NC transformation. 307 − 311 This is triggered by the extraction of PbBr 2 from the 3D CsPbBr 3 perovskite NCs that are operated by the excess amines. 70 , 307 It has been reported that, by adding alkyl-thiol ligands, the size uniformity and chemical stability of the as-transformed Cs 4 PbBr 6 NCs can be greatly improved.…”

Section: Surface Shape and Phase Postmodificationsmentioning

confidence: 99%

Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications, and Their Optical Properties

et al. 2019

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Metal halide perovskites represent a flourishing area of research, which is driven by both their potential application in photovoltaics and optoelectronics and by the fundamental science behind their unique optoelectronic properties. The emergence of new colloidal methods for the synthesis of halide perovskite nanocrystals, as well as the interesting characteristics of this new type of material, has attracted the attention of many researchers. This review aims to provide an up-to-date survey of this fast-moving field and will mainly focus on the different colloidal synthesis approaches that have been developed. We will examine the chemistry and the capability of different colloidal synthetic routes with regard to controlling the shape, size, and optical properties of the resulting nanocrystals. We will also provide an up-to-date overview of their postsynthesis transformations, and summarize the various solution processes that are aimed at fabricating halide perovskite-based nanocomposites. Furthermore, we will review the fundamental optical properties of halide perovskite nanocrystals by focusing on their linear optical properties, on the effects of quantum confinement, and on the current knowledge of their exciton binding energies. We will also discuss the emergence of nonlinear phenomena such as multiphoton absorption, biexcitons, and carrier multiplication. Finally, we will discuss open questions and possible future directions.

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Section: Surface Shape and Phase Postmodificationsmentioning

confidence: 99%

Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications, and Their Optical Properties

et al. 2019

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“…High incident angle (2°) XRD analyses confirmed the phase purity in the bulk of the CSS‐deposited CsPbBr 3 films (Figure S1, Supporting Information) with the orthorhombic perovskite structure. [ 8,9,12,23 ] No diffraction peaks for polymorphs Cs 4 PbBr 6 and CsPb 2 Br 5 [ 24 ] (Figure S2, Supporting Information) were observed, further demonstrating the phase purity of the deposited CsPbBr 3 films. The crystallite size of the as‐deposited CsPbBr 3 was in the range of ≈245 nm with lattice constants a = 8.205, b = 11.694, and c = 8.268 Å, consistent with the orthorhombic CsPbBr 3 phase.…”

Section: Cspbbr3 Film Deposition Using Close Space Sublimationmentioning

confidence: 99%

Cesium Lead Bromide (CsPbBr₃) Thin‐Film‐Based Solid‐State Neutron Detector Developed by a Solution‐Free Sublimation Process

Fernández‐Izquierdo

Reyes-Banda

Mathew

et al. 2020

Adv Materials Technologies

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Besides its high stability, CsPbBr 3 possesses interesting electronic and optoelectronic properties such as high attenuation above the band gap, good photoresponse, large electron and hole mobility, long lifetimes, low excitation binding energy, halogen self-passivation, defect tolerance, luminosity, etc. [1,4-11] Device-quality single crystals have been prepared using a number of methods including a high-temperature process, [4] solution-based methods such as antisolvent vapor crystallization (AVC), [7,8,10] and inverse temperature crystallization. [12] The carrier concentration (holes) of these crystals varies in the range of 5 × 10 7 to 1 × 10 8 cm −3[9,10] and about 1 × 10 9 cm −3 for electrons, [9] resulting in nearly intrinsic crystals with resistivities in the range of 1-3 GΩ cm. [10] As a reference, Bridgmangrown crystals show resistivities as high as ≈340 GΩ cm [4,13] and mobility-lifetime (μτ) product for electrons and holes in the range of 1.7 × 10 −3 to 4.5 × 10 −4 cm 2 V −1 and 1.3 × 10 −3 to 9.5 × 10 −4 cm 2 V −1 , respectively. [4,14,15] These μτ values are better than that of CdZnTe (CZT) and CdTe. It is important to note that the electron μτ product of CZT and CdTe [4,11] is in the lower range of the corresponding values for CsPbBr 3 while the hole μτ product is only 0.1% that of CsPbBr 3. [4] The reported use of CsPbBr 3 for radiation sensing is limited to single crystals, except for its use as a thin film in X-ray scintillators. [1,3] There are no reports for direct radiation detection using thin-film diodes based on CsPbBr 3. This is related to the lack of deposition techniques for thick CsPbBr 3 films. The close space sublimation (CSS) process reported here addresses this problem. Although the intrinsic phase purity and crystal quality of single crystals offer improved optoelectronic properties, the high cost of the single crystal approach renders this option nonviable for portable and large-area applications, hence thin films are a better option. Furthermore, the photon attenuation coefficient of CsPbBr 3 is linear and comparable to that of CZT for energies up to 1000 keV, [4] but no exhaustive studies exist for the interaction of CsPbBr 3 with charged particles (α, β, etc.) or for higher photon energies such as gamma rays. The interaction of CsPbBr 3 2D nanosheets with ionizing radiation has been reported recently showing scintillation performance comparable to commercial crystals. [1] The observed The majority of solid-state radiation sensors are predominantly single crystals. However, for low-cost and large-area device applications, thin films are a better option. The first evidence of neutron detection using a Gallium Oxide/Cesium Lead Bromide (Ga 2 O 3 /CsPbBr 3) solid-state diode enabled by an innovative close space sublimation (CSS) method that allows deposition of thick CsPbBr 3 films is demonstrated. Furthermore, indirect neutron sensing is achieved using a 10 B layer for diodes biased at voltages as low as-5 V, showing the potential for low-power operation. The neutron response is ...

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“…By changing the amount of bromine, we acquired different products. In the case of Cs:Pb:Br=1:6:6, the absorption peak is at 340 nm and there is no PL‐emission peak, which is could be due to formation of the nonluminescent CsPb 2 Br 5 phase of the perovskite NCs [37] . On increasing the Br concentration, CsPbBr 3 NCs are formed, which emit green light under UV irradiation.…”

Section: Resultsmentioning

confidence: 99%

Completely Amine‐Free Open‐Atmospheric Synthesis of High‐Quality Cesium Lead Bromide (CsPbBr₃) Perovskite Nanocrystals

Akhil

Dutt

Mishra

2020

Chemistry A European J

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Cesium lead halide perovskite nanocrystals (NCs) CsPbX3 (X=Cl, Br, and I) have been prominent materials in the last few years due to their high photoluminescence quantum yield (PLQY) for light‐emitting diodes and other significant applications in photovoltaics and optoelectronics. In colloidal CsPbX3 synthesis, the most commonly used ligands are oleic acid and oleylamine. The latter plays an important role in surface passivation but may also be responsible for poor colloidal stability as a result of facile proton exchange leading to the formation of labile oleylammonium halide, which pulls halide ions out of the NC surface. Herein, a facile, efficient, completely amine‐free synthesis of cesium lead bromide perovskite nanocrystals using hydrobromic acid as halide source and tri‐n‐octylphosphane as ligand under open‐atmospheric conditions is demonstrated. Hydrobromic acid serves as labile source of bromide ion, and thus this three‐precursor approach (separate precursors for Cs, Pb, Br) gives more control than a conventional single‐source precursor for Pb and Br (PbBr2). The use of HBr paved the way to eliminate oleylamine, and thus the formation of labile oleylammonium halide can be completely excluded. Various Cs:Pb:Br molar ratios were studied and optimum conditions for making very stable CsPbBr3 NCs with high PLQY were found. These completely amine‐free CsPbBr3 perovskite NCs synthesized under bromine‐rich conditions exhibit good stability and durability for more than three months in the form of colloidal solutions and films, respectively. Furthermore, stable tunable emission across a wide spectral range through anion exchange was demonstrated. More importantly, this work reports open‐atmosphere‐stable CsPbBr3 NCs films exhibiting strong PL, which can be further used for optoelectronic device applications.

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Inter-Conversion between Different Compounds of Ternary Cs-Pb-Br System

Cited by 33 publications

References 19 publications

Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications, and Their Optical Properties

Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications, and Their Optical Properties

Cesium Lead Bromide (CsPbBr₃) Thin‐Film‐Based Solid‐State Neutron Detector Developed by a Solution‐Free Sublimation Process

Completely Amine‐Free Open‐Atmospheric Synthesis of High‐Quality Cesium Lead Bromide (CsPbBr₃) Perovskite Nanocrystals

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Inter-Conversion between Different Compounds of Ternary Cs-Pb-Br System

Cited by 33 publications

References 19 publications

Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications, and Their Optical Properties

Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications, and Their Optical Properties

Cesium Lead Bromide (CsPbBr3) Thin‐Film‐Based Solid‐State Neutron Detector Developed by a Solution‐Free Sublimation Process

Completely Amine‐Free Open‐Atmospheric Synthesis of High‐Quality Cesium Lead Bromide (CsPbBr3) Perovskite Nanocrystals

Contact Info

Product

Resources

About

Cesium Lead Bromide (CsPbBr₃) Thin‐Film‐Based Solid‐State Neutron Detector Developed by a Solution‐Free Sublimation Process

Completely Amine‐Free Open‐Atmospheric Synthesis of High‐Quality Cesium Lead Bromide (CsPbBr₃) Perovskite Nanocrystals