The raman spectra of the family crystals Cs3Bi2Br9, Rb3Bi2Br9 and Rb3Sb2Br9

Valakh, M. Ya.; Lisitsa, M. P.; Peresh, E. Yu.; Trylis, O. V.; Yaremko, A. M.

doi:10.1016/s0022-2860(97)00204-4

Cited by 30 publications

(32 citation statements)

References 12 publications

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“…Remarkably, the Rb 3 Bi 2 I 9 structure differs thus from both reported modifications of Cs 3 Bi 2 I 9 10,11. In view of the monoclinic space group for Rb 3 Bi 2 I 9 , the space group P 6 3 / mmc suggested for the related compound Rb 3 Bi 2 Br 9 seemed questionable to us 3,12. In fact, the structure determination from single crystal data revealed space group P 2 1 / a and the new Tl 3 Bi 2 Br 9 type of structure instead, which is closely related to the Tl 3 Bi 2 I 9 type (see below).…”

Section: Resultsmentioning

confidence: 80%

“…Typically, they show higher thermal stability than their neighboring phases in the phase diagrams. Driven by the interest on their optical and electronic properties,1–3 materials design has been extended to phases with monovalent organic cations. The basic building principles within the structure family have been described by Wells , who explained the structural organization of the M 3 E 2 X 9 family by sphere close packing 4.…”

Section: Introductionmentioning

confidence: 99%

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Structural Variety of Defect Perovskite Variants M₃E₂X₉ (M = Rb, Tl, E = Bi, Sb, X = Br, I)

Chang

Doert

Ruck

2016

Zeitschrift anorg allge chemie

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The compounds Rb Br 9 were synthesized and their crystal structures determined from single crystal X-ray diffraction data. The compounds Rb 3 Sb 2 Br 9 , Rb 3 Sb 2 I 9 , and Rb 3 Bi 2 I 9 crystallize in the Tl 3 Bi 2 I 9 type of structure (space group P2 1 /n, no. 14). Rb 3 Bi 2 Br 9 and Tl 3 Bi 2 Br 9 crystallize in a new but closely related type of structure (space group P2 1 /a, no. 14). Both structure types feature characteristic double layers comprising 736 corner-sharing EX 6 octahedra. The space groups are set in a way that the stacking direction of the layers is the [001] direction. The groupsubgroup relations to cubic perovskite ABO 3 are discussed. Differences between M 3 E 2 X 9 types are attributed to distortions of the underlying MX 3 close packing. Depending on the atomic size ratio, the distortions are quantified by an order parameter. [18] 1 ϱ [E 4 X 12+12/2 ] Z. Anorg. Allg. Chem. 2016, 736-748Electron Microscopy: Scanning electron microscopy (SEM) was performed with a Hitachi SU8020 with a triple detector system for secondary and low-energy backscattered electrons (U a = 5 kV). Energydispersive X-ray (EDX) spectra of single crystals were measured with 30 kV. Single crystals were selected using a microscope with polarized

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Structural Variety of Defect Perovskite Variants M₃E₂X₉ (M = Rb, Tl, E = Bi, Sb, X = Br, I)

Chang

Doert

Ruck

2016

Zeitschrift anorg allge chemie

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“…5 During the optimization stage of producing our high phase purity Cs 2 AgBiBr 6 single crystals, the yellow phase was on occasion inadvertently synthesized, and we provide its characterization using energy-dispersive X-ray spectroscopy (Figure S1; showing the material to be Bi-rich) and Raman spectroscopy (Figure S2; identifying its unique Raman modes) in the Supporting Information. With sound alignment between their vibrational energies, comparison of the Raman spectrum recorded from our Bi-rich yellow phase material with that reported for Cs 3 Bi 2 Br 9 35 indicates that this is its composition. Where XRD unavoidably requires bulk characterization and might potentially miss the presence of microscopic trace amounts of the second yellow phase, we emphasize that the vibrational signatures of the yellow phase can provide a relatively straightforward and reliable probe for evaluating localized deviations in phase purity within single crystals.…”

Section: Resultsmentioning

confidence: 99%

Giant Electron–Phonon Coupling and Deep Conduction Band Resonance in Metal Halide Double Perovskite

et al. 2018

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The room-temperature charge carrier mobility and excitation-emission properties of metal halide perovskites are governed by their electronic band structures and intrinsic lattice phonon scattering mechanisms. Establishing how charge carriers interact within this scenario will have far-reaching consequences for developing high-efficiency materials for optoelectronic applications. Herein we evaluate the charge carrier scattering properties and conduction band environment of the double perovskite CsAgBiBr via a combinatorial approach; single crystal X-ray diffraction, optical excitation and temperature-dependent emission spectroscopy, resonant and nonresonant Raman scattering, further supported by first-principles calculations. We identify deep conduction band energy levels and that scattering from longitudinal optical phonons- via the Fröhlich interaction-dominates electron scattering at room temperature, manifesting within the nominally nonresonant Raman spectrum as multiphonon processes up to the fourth order. A Fröhlich coupling constant nearing 230 meV is inferred from a temperature-dependent emission line width analysis and is found to be extremely large compared to popular lead halide perovskites (between 40 and 60 meV), highlighting the fundamentally different nature of the two "single" and "double" perovskite materials branches.

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“…The modes at 167 and 192 cm –1 are indexed to E g and A 1g , respectively, and are associated with stretching vibrations of Bi–Br bonds . The other four are labeled as M 1 (63.9 cm –1 ), M 2 (67.3 cm –1 ), M 3 (78.8 cm –1 ), and M 4 (92.2 cm –1 ) and originate due to vibrations of Br atoms only. , Pressure evolution of Raman mode frequencies are shown in Figure S4. With pressure, all modes are blue-shifted, indicating the increase of Bi–Br bond strength.…”

Section: Results and Discussionmentioning

confidence: 99%

Pressure-Induced Emergence of Visible Luminescence in Lead Free Halide Perovskite Cs₃Bi₂Br₉: Effect of Structural Distortion

et al. 2021

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We report a detailed high pressure study involving X-ray diffraction, Raman spectroscopy, and photoluminescence measurements on a model Pb-free solar cell material Cs3Bi2Br9 halide perovskite. The sample starts showing photoluminescence in a broad range of 550–900 nm above 1.4 GPa, due to an isostructural transition to a distorted unit cell. Further enhancement in intensity with pressure is found to be driven by an increase in distortion of BiBr6 octahedra. Electronic band structure calculations show the sample in the high pressure phase to be an indirect band gap semiconductor. The photoluminescence peak shows a kink at higher energy and a broad asymmetric peak at lower energies due to the recombination of free excitons and self-trapped excitons, respectively. The blue shift of the PL peaks until about 4.4 GPa can be related to the extensive structural distortion before the transition to lowest symmetry triclinic phase.

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The raman spectra of the family crystals Cs3Bi2Br9, Rb3Bi2Br9 and Rb3Sb2Br9

Cited by 30 publications

References 12 publications

Structural Variety of Defect Perovskite Variants M₃E₂X₉ (M = Rb, Tl, E = Bi, Sb, X = Br, I)

Structural Variety of Defect Perovskite Variants M₃E₂X₉ (M = Rb, Tl, E = Bi, Sb, X = Br, I)

Giant Electron–Phonon Coupling and Deep Conduction Band Resonance in Metal Halide Double Perovskite

Pressure-Induced Emergence of Visible Luminescence in Lead Free Halide Perovskite Cs₃Bi₂Br₉: Effect of Structural Distortion

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The raman spectra of the family crystals Cs3Bi2Br9, Rb3Bi2Br9 and Rb3Sb2Br9

Cited by 30 publications

References 12 publications

Structural Variety of Defect Perovskite Variants M3E2X9 (M = Rb, Tl, E = Bi, Sb, X = Br, I)

Structural Variety of Defect Perovskite Variants M3E2X9 (M = Rb, Tl, E = Bi, Sb, X = Br, I)

Giant Electron–Phonon Coupling and Deep Conduction Band Resonance in Metal Halide Double Perovskite

Pressure-Induced Emergence of Visible Luminescence in Lead Free Halide Perovskite Cs3Bi2Br9: Effect of Structural Distortion

Contact Info

Product

Resources

About

Structural Variety of Defect Perovskite Variants M₃E₂X₉ (M = Rb, Tl, E = Bi, Sb, X = Br, I)

Structural Variety of Defect Perovskite Variants M₃E₂X₉ (M = Rb, Tl, E = Bi, Sb, X = Br, I)

Pressure-Induced Emergence of Visible Luminescence in Lead Free Halide Perovskite Cs₃Bi₂Br₉: Effect of Structural Distortion