A Raman study of RbSnBr3

Kuok, M. H.; Tan, Li‐Min; Shen, Zexiang; Huan, C. H. A.; Mok, K. F.

doi:10.1016/0038-1098(95)00625-7

Cited by 18 publications

(10 citation statements)

References 12 publications

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“…To the best of the author’s knowledge, none of the selected silicon-based perovskites has yet been synthesized, together with RbGeI 3 and RbGeBr 3 . On the other hand, RbSnI 3 and RbSnBr 3 were synthesized in the optically inactive yellow phase, it still being unknown if they can be stabilized in a perovskite phase. , These amount to 7 promising compositions still to be explored. Also, FASiI 3 is the single perovskite for which neither experimental nor theoretical publications were found.…”

Section: Resultsmentioning

confidence: 99%

Electronic Structure Panorama of Halide Perovskites: Approximated DFT-1/2 Quasiparticle and Relativistic Corrections

et al. 2020

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Halide perovskite compounds emerged recently as great candidates for efficient photovoltaics, although huge technical obstacles still have to be overcome. Additionally, their accurate theoretical description is difficult to be reached due to the high level of complexity of this class of materials. In this work, we provide a vast panorama of electronic properties, correlated with its relaxed internal geometry, for a group of 48 ABX3 cubic halide perovskites (A = CH3NH3, CH(NH2)2, Cs, Rb; B = Pb, Sn, Ge, Si; X = I, Br, Cl). Including the DFT-1/2 approximated quasiparticle and spin–orbit corrections, our model results in band gaps with an impressive agreement with experiments, comparable with the expensive state-of-the-art GW method. We provide trends in electronic properties depending on different atoms exchanged, concluding that 16 materials present band gaps more suitable for solar cell applications. Besides, the formation of BX3 units is observed in hybrid Sn, Ge, and Si perovskites, resulting from the distortion of the inorganic lattice. We elucidate the significant band gap broadening due to this segregation using orbital overlap considerations, which is consistent with previous experimental findings. Finally, the presented method establishes a reliable low-cost approach, being especially useful for more sophisticated perovskite systems as heterostructures, alloys, and low symmetric compounds.

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Section: Resultsmentioning

confidence: 99%

Electronic Structure Panorama of Halide Perovskites: Approximated DFT-1/2 Quasiparticle and Relativistic Corrections

et al. 2020

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“…Thus, a complete investigation of the synthesis and the structural and optical properties on the Cs 1– x Rb x SnBr 3 system, through a combined experimental and computational approach, is presented here. Notably, the substitution of Cs + with Rb + within the CsSnBr 3 phase was not reported in the literature, while only the synthesis of RbSnBr 3 single crystals has been reported together with a Raman spectroscopy characterization …”

Section: Introductionmentioning

confidence: 99%

Synthesis, Properties, and Modeling of Cs_1–xRb_xSnBr₃ Solid Solution: A New Mixed-Cation Lead-Free All-Inorganic Perovskite System

et al. 2019

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In the present work, the substitution of cesium (Cs+) with rubidium (Rb+) in fully inorganic tin bromide perovskites Cs1–x Rb x SnBr3, has been experimentally demonstrated by synthesizing pure single-phase samples in the CsSnBr3–Cs0.70Rb0.30SnBr3 compositional range. The substitution of Cs with Rb is responsible for structural modification from cubic to orthorhombic symmetry, which has been correlated with optical properties, as the band gap varies from 1.719 to 1.817 eV from CsSnBr3 to Cs0.70Rb0.30SnBr3 sample. Notably, all of the rubidium-embedding alloys present good air stability. All of these results are very straightforward and open the possibility to exploit the electrical and optical capabilities of this very promising family of lead-free materials.

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“…These energies correlate well with Cs + polar phonon modes identified by Raman spectroscopy and DFT calculations. 78,97,98 The circumstance for the appearance of pronounced anti-Stokes bands over the Stokes bands is possibly related to the structural distortions induced by illumination, resulting in nonthermal phonon populations which could change the relative weights of Stokes/anti-Stokes bands. Given the complexity of this mechanism, which involves dynamical, excitonic, and spin degrees of freedom, we defer a detailed investigation to a future publication.…”

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confidence: 99%

Rashba Effect in a Single Colloidal CsPbBr₃ Perovskite Nanocrystal Detected by Magneto-Optical Measurements

et al. 2017

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This study depicts the influence of the Rashba effect on the band-edge exciton processes in all-inorganic CsPbBr perovskite single colloidal nanocrystal (NC). The study is based on magneto-optical measurements carried out at cryogenic temperatures under various magnetic field strengths in which discrete excitonic transitions were detected by linearly and circularly polarized measurements. Interestingly, the experiments show a nonlinear energy splitting between polarized transitions versus magnetic field strength, indicating a crossover between a Rashba effect (at the lowest fields) to a Zeeman effect at fields above 4 T. We postulate that the Rashba effect emanates from a lattice distortion induced by the Cs motion degree of freedom or due to a surface effect in nanoscale NCs. The unusual magneto-optical properties shown here underscore the importance of the Rashba effect in the implementation of such perovskite materials in various optical and spin-based devices.

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A Raman study of RbSnBr3

Cited by 18 publications

References 12 publications

Electronic Structure Panorama of Halide Perovskites: Approximated DFT-1/2 Quasiparticle and Relativistic Corrections

Electronic Structure Panorama of Halide Perovskites: Approximated DFT-1/2 Quasiparticle and Relativistic Corrections

Synthesis, Properties, and Modeling of Cs_1–xRb_xSnBr₃ Solid Solution: A New Mixed-Cation Lead-Free All-Inorganic Perovskite System

Rashba Effect in a Single Colloidal CsPbBr₃ Perovskite Nanocrystal Detected by Magneto-Optical Measurements

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A Raman study of RbSnBr3

Cited by 18 publications

References 12 publications

Electronic Structure Panorama of Halide Perovskites: Approximated DFT-1/2 Quasiparticle and Relativistic Corrections

Electronic Structure Panorama of Halide Perovskites: Approximated DFT-1/2 Quasiparticle and Relativistic Corrections

Synthesis, Properties, and Modeling of Cs1–xRbxSnBr3 Solid Solution: A New Mixed-Cation Lead-Free All-Inorganic Perovskite System

Rashba Effect in a Single Colloidal CsPbBr3 Perovskite Nanocrystal Detected by Magneto-Optical Measurements

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Synthesis, Properties, and Modeling of Cs_1–xRb_xSnBr₃ Solid Solution: A New Mixed-Cation Lead-Free All-Inorganic Perovskite System

Rashba Effect in a Single Colloidal CsPbBr₃ Perovskite Nanocrystal Detected by Magneto-Optical Measurements