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. 2017 Jan 4;8:14051. doi: 10.1038/ncomms14051

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(a) Optical image of needle-shaped 1D lead bromide perovskite single crystals. (b) Structure of 1D perovskite C₄N₂H₁₄PbBr₄ (red spheres: lead atoms; green spheres: bromine atoms; blue spheres: nitrogen atoms; grey spheres: carbon atoms; purple polyhedrons: PbBr₆ ⁴⁻ octahedrons; hydrogen atoms were hidden for clarity). (c) View of an individual lead bromide quantum wire wrapped by the organic cations. (d) View of an individual lead bromide quantum wire with edge sharing octahedrons. (e) Transmission electron microscopy (TEM) image of the microscale 1D perovskite crystals. (f) Electron diffraction pattern along [210] zone axis. (g) Powder X-ray diffraction (PXRD) patterns of the bulk and microscale 1D perovskite crystals, as well as the simulated PXRD patterns based on the single crystal structure.