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Single crystal
About: Single crystal is a research topic. Over the lifetime, 59617 publications have been published within this topic receiving 870828 citations.
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TL;DR: In this article, a grazing-incidence X-ray absorption fine structure (GI-XAFS) measurement was performed on α-Al2O3 (0001) single crystal surface.
134 citations
TL;DR: By elaborate adjustment of synthesis conditions, cubic (Pm3n) SBA-1 samples with well-defined crystal morphologies of a large number of facets have been synthesized, which are supposed to be obtained as a result of highly isotropic crystal growth under the conditions near thermodynamic equilibrium as discussed by the authors.
Abstract: By elaborate adjustment of synthesis conditions, cubic (Pm3n) SBA-1 samples with well-defined crystal morphologies of a large number of facets have been synthesized, which are supposed to be obtained as a result of highly isotropic crystal growth under the conditions near thermodynamic equilibrium. The high-resolution transmission electron microscope image revealed regular periodicity over very large areas and this clearly indicates the crystal is a single crystal with a well-ordered mesostructure.
133 citations
TL;DR: In this article, the effect of white light illumination on the electronic and chemical properties of mixed halide perovskite (CH3NH3PbI3−xClx) thin films and single crystals using photoelectron and absorption spectroscopy was investigated.
Abstract: This study investigates the effect of white light illumination on the electronic and chemical properties of mixed halide perovskite (CH3NH3PbI3−xClx) thin films and CH3NH3PbI3 single crystals using photoelectron and absorption spectroscopy. The pristine materials' surfaces are found to be n-type because of surface band bending due to the presence of donor levels, likely consisting of reduced lead (Pb0) that acts as surface traps. When illuminating the sample with white light (up to 1 sun), the valence features shifted to lower binding energy due to surface photovoltage, i.e., the bulk of the materials is much less n-type. However, the surface photovoltage is only partially reversible and vanishes for prolonged illumination time. Concomitantly, a high concentration of metallic Pb0 is found, which induces strong Fermi-level pinning and quenching of the surface photovoltage. This is accompanied also by the formation of PbI2 defects. Similar experiments on single crystals reveal the presence of a high concentration of reduced (metallic) Pb0 at the sample surface after cleaving. The present findings indicate that the chemical and electronic properties of perovskite films are very sensitive to white light illumination. Accounting for these light-induced material changes is important to fully understand its photophysical properties and for improving the lifetime of perovskite-based devices.
133 citations
TL;DR: In this paper, the authors observed on a NiO single crystal two superlattice X ray diffraction peaks, which disappear above the Neel point, and their intensities, 4 × 10 -8 smaller than normal ones, agree with those evaluated from photon-electron spin interaction.
133 citations
TL;DR: In this article, single crystal growth of wafer-scale hexagonal boron nitride (hBN), an insulating atomic thin monolayer, on high-symmetry index surface plane Cu(111) was demonstrated.
Abstract: We demonstrate single crystal growth of wafer-scale hexagonal boron nitride (hBN), an insulating atomic thin monolayer, on high-symmetry index surface plane Cu(111). The unidirectional epitaxial growth is guaranteed by large binding energy difference, ~0.23 eV, between A- and B-steps edges on Cu(111) docking with B6N7 clusters, confirmed by density functional theory calculations.
133 citations