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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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173 citations
TL;DR: It is found that Br incorporation can effectively control the perovskite crystallization kinetics and reduce defect density to acquire high-quality single crystals with significant inhibition of δ-phase.
Abstract: The spontaneous α-to-δ phase transition of the formamidinium-based (FA) lead halide perovskite hinders its large scale application in solar cells. Though this phase transition can be inhibited by alloying with methylammonium-based (MA) perovskite, the underlying mechanism is largely unexplored. In this Communication, we grow high-quality mixed cations and halides perovskite single crystals (FAPbI3)1–x(MAPbBr3)x to understand the principles for maintaining pure perovskite phase, which is essential to device optimization. We demonstrate that the best composition for a perfect α-phase perovskite without segregation is x = 0.1–0.15, and such a mixed perovskite exhibits carrier lifetime as long as 11.0 μs, which is over 20 times of that of FAPbI3 single crystal. Powder XRD, single crystal XRD and FT-IR results reveal that the incorporation of MA+ is critical for tuning the effective Goldschmidt tolerance factor toward the ideal value of 1 and lowering the Gibbs free energy via unit cell contraction and cation ...
173 citations
TL;DR: By fixing charged colloidal crystals in a poly(acrylamide) hydrogel matrix, this paper fabricated photonic crystals whose diffraction peak wavelengths were tunable by applying mechanical stress.
Abstract: By fixing charged colloidal crystals in a poly(acrylamide) hydrogel matrix, we fabricated photonic crystals whose diffraction peak wavelengths were tunable by applying mechanical stress. The reflection spectrum for a single crystal grain was measured by applying microspectroscopy under compression. The photonic band gap wavelength shifted linearly and reversibly over almost the entire visible light wavelength region (460−810 nm).
173 citations
TL;DR: In this paper, the crystal structure of the Cu2Zn/Cd,Hg/SnSe4 compounds were investigated using X-ray powder diffraction and the results showed that these compounds crystallize in the stannite structure (space group I 4 2m).
173 citations
TL;DR: In this paper, the magnetic properties of a uniform array of Fe nanowires and the magnetization reversal in a single magnetic domain were investigated by Mossbauer spectroscopy and vibrating sample magnetometry.
Abstract: Uniform arrays of Fe nanowires were prepared by electrochemical deposition of iron into nanoporous anodic aluminum oxide films. The microstructure and crystal structures of the nanowires were studied by transmission electron microscopy and electron diffraction. It was found that each nanowire looked like a chain of dots and each dot in the chain was supposed to be a single crystal of α-Fe. Each dot was shown to be a single magnetic domain. The magnetic properties of a uniform array of Fe nanowires and the magnetization reversal in a Fe nanowire were investigated by Mossbauer spectroscopy and vibrating sample magnetometry, which demonstrated that the film of Fe nanowires in alumina had superior perpendicular magnetic characteristics. The magnetic studies also revealed that the moments of each single domain dot were oriented along the chain. Experimental results could be interpreted by the reversal model of “chains of spheres” with the symmetric fanning mechanism.
173 citations