Compressibility of Cs 2 SnBr 6 by X-ray diffraction and Raman spectroscopy

Yuan, Guan; Huang, Shengxuan; Niu, Jingjing; Qin, Shan; Wu, Xiang; Ding, Haiyang; Lu, Anhuai

doi:10.1016/j.ssc.2018.03.014

Cited by 27 publications

(19 citation statements)

References 26 publications

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“…Raman spectra further highlighted the observed lattice expansion. As shown in Figure 1j the Raman active mode, ν ( A 1 g ), related to the SnBr symmetric stretching inside [SnBr 6 ] 4− octahedra, [ 22 ] first appeared in the pristine ODASnBr 4 [2%] at 197 cm −1 and then gradually shifted to 191 cm −1 for ODASnBr 4 [2%‐DCM], and to 184 cm −1 for ODASnBr 4 [2%‐CFM]. This indicates that, consequent to the doping process, the [SnBr 6 ] 4− octahedra were under increased tensile strain resulting in longer SnBr bond lengths, and thus a shift to lower resonant frequencies for the Raman active vibrational mode was observed.…”

Section: Resultsmentioning

confidence: 99%

Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Induced by Molecular Proton Donors Chloroform and Dichloromethane

Wang

Popović

Burazer

et al. 2021

Adv Funct Materials

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Lead‐free 2D perovskites based on tin halide octahedron slabs with Dion–Jacobson (DJ) phases have drawn attention due to their improved stability; still, reports on light‐emitting DJ lead‐free perovskites are scarce. Herein, a room‐temperature ligand assisted re‐precipitation method is used to produce ODASnBr4 perovskite microcrystals (ODA denotes protonated 1,8‐octanediamine). After incorporating molecular dopants chloroform and dichloromethane, not only the crystallinity of the DJ perovskite phase improves, but their emission becomes much stronger due to the formation of hydrogen bonds between [SnBr6]4− octahedra and acidic CH proton donors. ODASnBr4 microcrystals doped with these molecules show a high photoluminescence quantum yield (PLQY) approaching 90%, and their emission remains stable under a continuous UV irradiation, with less than 10% loss in intensity over 6 h. Moreover, by tuning the pristine ODASnBr4 with various degrees of exposure to the molecular dopants, the maximum of their self‐trapped exciton emission can be fine‐tuned over a spectral range of 570–608 nm while maintaining high PLQYs of 83–88%. This provides a convenient way to adjust the spectral position of DJ perovskite emission without changing halides or A‐site spacers. Thus, stable and strongly emitting lead‐free DJ perovskite materials have been developed.

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Section: Resultsmentioning

confidence: 99%

Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Induced by Molecular Proton Donors Chloroform and Dichloromethane

Wang

Popović

Burazer

et al. 2021

Adv Funct Materials

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“…According to the characterization data in Figure 2 labeled in orange, the Cs-Sn-Br powders exhibited the well-defined Cs 2 SnBr 6 crystalline structure and regular octahedral morphology. [36] Specifically, compared to Cs 2 SnI 6 , the Cs 2 SnBr 6 crystals showed better high-temperature stability with the decomposition temperature of ≈439 °C. XPS analysis verified the existence of cesium, tin and bromide in the form of Cs + , Sn 4+ , and Br − respectively.…”

Section: Doi: 101002/smll201901650mentioning

confidence: 93%

“…In this work, we also synthesized Cs 2 SnBr 6 powders successfully by replacing the precursors (CsI, SnI 2 , HI solution) with CsBr, SnBr 2 , and HBr solution. According to the characterization data in Figure labeled in orange, the Cs–Sn–Br powders exhibited the well‐defined Cs 2 SnBr 6 crystalline structure and regular octahedral morphology . Specifically, compared to Cs 2 SnI 6 , the Cs 2 SnBr 6 crystals showed better high‐temperature stability with the decomposition temperature of ≈439 °C.…”

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confidence: 98%

Lead‐Free Double Perovskite Cs₂SnX₆: Facile Solution Synthesis and Excellent Stability

Han

Liang

Yang

et al. 2019

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Long‐term instability and possible lead contamination are the two main issues limiting the widespread application of organic–inorganic lead halide perovskites. Here a facile and efficient solution‐phase method is demonstrated to synthesize lead‐free Cs2SnX6 (X = Br, I) with a well‐defined crystal structure, long‐term stability, and high yield. Based on the systematic experimental data and first‐principle simulation results, Cs2SnX6 displays excellent stability against moisture, light, and high temperature, which can be ascribed to the unique vacancy‐ordered defect‐variant structure, stable chemical compositions with Sn4+, as well as the lower formation enthalpy for Cs2SnX6. Additionally, photodetectors based on Cs2SnI6 are also fabricated, which show excellent performance and stability. This study provides very useful insights into the development of lead‐free double perovskites with high stability.

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“…[63][64][65][66] It therefore follows that similar electron-phonon coupling processes occur in the vacancy-ordered double perovskites and may even be enhanced by the presence of relatively decoupled octahedral units. 14,67 As the lattice dynamics of vacancy-ordered double perovskites are intimately linked with the A-site cation species and its interaction with the surrounding octahedral framework, the electronphonon coupling behavior in vacancy-ordered double perovskites follows trends predicted by the perovskite tolerance factor. As shown in Figure 9, the trend in experimental carrier mobilities across the A 2 SnI 6 series is reproduced by computationally-derived carrier mobilities calculated within a polaron model, indicating that electron-phonon coupling processes dominate the charge transport behavior in vacancy-ordered double perovskites.…”

Section: Lattice Dynamics and Electron-phonon Couplingmentioning

confidence: 99%

Perspectives and Design Principles of Vacancy-Ordered Double Perovskite Halide Semiconductors

et al. 2019

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Halide perovskite semiconductors such as methylammonium lead iodide (CH 3 NH 3 PbI 3) have achieved great success in photovoltaic devices, yet concerns surrounding toxicity of lead and material stability have motivated the field to pursue alternative perovskite compositions and structures. Vacancy-ordered double perovskites are a defect-ordered variant of the perovskite structure characterized by an antifluorite arrangement of isolated octahedral units bridged by A-site cations. In this perspective, we focus upon the structure-dynamics-property relationships in vacancy-ordered double perovskite semiconductors as they pertain to applications in photovoltaics, and propose avenues of future study within the context of the broader 1 perovskite halide literature. We describe the compositional and structural motifs that dictate the optical gaps and charge transport behavior and discuss the implications of charge ordering, lattice dynamics, and organic-inorganic coupling upon the properties of these materials. The design principles we elucidate here represent a first step towards extending our understanding of perovskite functionality to defect-ordered perovskites.

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Compressibility of Cs 2 SnBr 6 by X-ray diffraction and Raman spectroscopy

Cited by 27 publications

References 26 publications

Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Induced by Molecular Proton Donors Chloroform and Dichloromethane

Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Induced by Molecular Proton Donors Chloroform and Dichloromethane

Lead‐Free Double Perovskite Cs₂SnX₆: Facile Solution Synthesis and Excellent Stability

Perspectives and Design Principles of Vacancy-Ordered Double Perovskite Halide Semiconductors

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Compressibility of Cs 2 SnBr 6 by X-ray diffraction and Raman spectroscopy

Cited by 27 publications

References 26 publications

Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Induced by Molecular Proton Donors Chloroform and Dichloromethane

Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Induced by Molecular Proton Donors Chloroform and Dichloromethane

Lead‐Free Double Perovskite Cs2SnX6: Facile Solution Synthesis and Excellent Stability

Perspectives and Design Principles of Vacancy-Ordered Double Perovskite Halide Semiconductors

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Product

Resources

About

Lead‐Free Double Perovskite Cs₂SnX₆: Facile Solution Synthesis and Excellent Stability