Scanning transmission electron diffraction methods

Eggeman, Alexander S.

doi:10.1107/s2052520619006723

Cited by 12 publications

(8 citation statements)

References 73 publications

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“…The SED data was obtained in a4DSTEM approach. [57,58] After 5min, egg-shaped structures having agrainy texture are already observable and resemble the crystal morphology and monodispersity observed after prolonged heating (Figure 5B-D). During the solvothermal reaction, these structures increase in size (5 min.…”

Section: Resultsmentioning

confidence: 58%

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Unusual Surface Texture, Dimensions and Morphology Variations of Chiral and Single Crystals**

et al. 2021

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We demonstrate here a unique metallo‐organic material where the appearance and the internal crystal structure are in contradiction. The egg‐shaped (ovoid) crystals have a brain‐like texture. Although these micro‐sized crystals are monodispersed; like fingerprints their grainy surfaces are never exactly alike. Remarkably, our X‐ray and electron diffraction studies unexpectedly revealed that these structures are single‐crystals comprising a continuous coordination network of two differently shaped homochiral channels. By using the same building blocks under different reaction conditions, a rare series of crystals have been obtained that are uniquely rounded in their shape. In stark contrast to the brain‐like crystals, these isostructural and monodispersed crystals have a comparatively smooth appearance. The sizes of these crystals vary by several orders of magnitude.

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Section: Resultsmentioning

confidence: 58%

“… Single crystallinity of Ni‐AdDB using cryo‐scanning electron diffraction (SED) and 3D‐reconstruction by electron tomography. The SED data was obtained in a 4D STEM approach [57, 58] . (A) Virtual annular dark‐field (ADF) image, that is, the integral high angle scattering signal as a function of raster position.…”

Section: Resultsmentioning

confidence: 99%

Unusual Surface Texture, Dimensions and Morphology Variations of Chiral and Single Crystals**

et al. 2021

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“…[ 1–3 ] Scanning nanoprobe characterization techniques, such as scanning electron diffraction (SED) or nanoprobe X‐ray diffraction (nXRD), are particularly advantageous as they can access both the relevant nano‐ and microscales. [ 4,5 ]…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Scanning nanoprobe characterization techniques, such as scanning electron diffraction (SED) or nanoprobe X-ray diffraction (nXRD), are particularly advantageous as they can access both the relevant nano-and microscales. [4,5] Both techniques use focused radiation, which interacts with the material and can impact its structure and chemistry, especially for materials with complex stoichiometries such as hybrid halide perovskites that mix organic and inorganic ions. These hybrid halide perovskites areThe interaction of high-energy electrons and X-ray photons with beamsensitive semiconductors such as halide perovskites is essential for the characterization and understanding of these optoelectronic materials.…”

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confidence: 99%

Unveiling the Interaction Mechanisms of Electron and X‐ray Radiation with Halide Perovskite Semiconductors using Scanning Nanoprobe Diffraction

et al. 2022

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The interaction of high‐energy electrons and X‐ray photons with beam‐sensitive semiconductors such as halide perovskites is essential for the characterization and understanding of these optoelectronic materials. Using nanoprobe diffraction techniques, which can investigate physical properties on the nanoscale, studies of the interaction of electron and X‐ray radiation with state‐of‐the‐art (FA0.79MA0.16Cs0.05)Pb(I0.83Br0.17)3 hybrid halide perovskite films (FA, formamidinium; MA, methylammonium) are performed, tracking the changes in the local crystal structure as a function of fluence using scanning electron diffraction and synchrotron nano X‐ray diffraction techniques. Perovskite grains are identified, from which additional reflections, corresponding to PbBr2, appear as a crystalline degradation phase after fluences of 200 e− Å−2. These changes are concomitant with the formation of small PbI2 crystallites at the adjacent high‐angle grain boundaries, with the formation of pinholes, and with a phase transition from tetragonal to cubic. A similar degradation pathway is caused by photon irradiation in nano‐X‐ray diffraction, suggesting common underlying mechanisms. This approach explores the radiation limits of these materials and provides a description of the degradation pathways on the nanoscale. Addressing high‐angle grain boundaries will be critical for the further improvement of halide polycrystalline film stability, especially for applications vulnerable to high‐energy radiation such as space photovoltaics.

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“…This special issue features a collection of original contributions covering a broad range of aspects of electron crystallography. An interested reader will find papers describing the foundations and methodological basis of structure solution by electron diffraction (Eggeman, 2019;Kolb et al, 2019;Gemmi & Lanza, 2019), theoretical and methodological advances in data processing (Rauch & Vé ron, 2019;Palatinus et al, 2019;Latychevskaia & Abrahams, 2019), discussion of applications of electron diffraction outside the realm of perfectly periodic crystals (Gorelik et al, 2019;Mugnaioli & Gorelik, 2019) as well as specific case studies showing the application of the methods to hot topics in current crystallography (Wang et al, 2019;Hadermann & Abakumov, 2019).…”

mentioning

confidence: 99%