Lead iodide (PbI2) films composed of single crystals with regular hexagonal microstructures have been in situ fabricated on lead foils through a one-step solution-phase chemical route under solvothermal conditions. X-Ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and transmission electron microscopy (TEM) were employed to characterize the resulting PbI2 crystals. The orientation of the hexagonal planes can be controlled via the adjustment of the concentration of iodine and the types of solvents. It is expected to be a simple way for in situ fa...
