2022
DOI: 10.1021/acs.accounts.2c00613
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Collective Diffraction Effects in Perovskite Nanocrystal Superlattices

Abstract: Conspectus For almost a decade now, lead halide perovskite nanocrystals have been the subject of a steadily growing number of publications, most of them regarding CsPbBr3 nanocubes. Many of these works report X-ray diffraction patterns where the first Bragg peak has an unusual shape, as if it was composed of two or more overlapping peaks. However, these peaks are too narrow to stem from a nanoparticle, and the perovskite crystal structure does not account for their formation. What is the origin of such an unus… Show more

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Cited by 22 publications
(20 citation statements)
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“…To facilitate the study of the fine structure of the splitting peak of 2θ ∼ 15.2°, Figure g indicates that the scattering angle (θ) of nano-SCs is transformed to the scattering vector ( q ) according to the formula q = (4π/λ X‑ray ) sin θ. The fringes are regularly spaced in q , which accords with a stacking periodicity of Λ = 2π/Δ q , where Δ q is the distance between fringes . As a result, the stacking periodicity of nano-SCs has a length of 9.2 ± 0.05 nm.…”
mentioning
confidence: 88%
“…To facilitate the study of the fine structure of the splitting peak of 2θ ∼ 15.2°, Figure g indicates that the scattering angle (θ) of nano-SCs is transformed to the scattering vector ( q ) according to the formula q = (4π/λ X‑ray ) sin θ. The fringes are regularly spaced in q , which accords with a stacking periodicity of Λ = 2π/Δ q , where Δ q is the distance between fringes . As a result, the stacking periodicity of nano-SCs has a length of 9.2 ± 0.05 nm.…”
mentioning
confidence: 88%
“…2A). 8,16,28 Within SLs, the PNCs act as diffraction gratings and X-rays are diffracted by the spacing of the PNCs from each other and their own atomic planes, allowing for splitting or fringes to occur at lower angles (15°2q). SLs also contain continuous disorder, related to variability in PNC-to- PNC spacing due to the thickness of organic capping group layers, and discrete disorder, relating to PNC monodispersity and inevitable misalignment of PNCs due to disordered sites, as observed through smoother and broader reections at higher angles (30°2q).…”
Section: Optical and Structural Characterization Of Cspbbr 3 Slsmentioning
confidence: 99%
“…QD arranged in ordered arrays support cooperative collective emission superfluorescence, which is faster and brighter than regular photoluminescence. Additionally, perovskite supercrystals demonstrate collective diffraction effects, and emission properties could be tunable by disorder or magnetic field . By controlling the QD size it is possible to tune the wavelength of superfluorescence due to quantum confinement without possible segregation, and thus to create different shapes of supercrystals .…”
mentioning
confidence: 99%