Insights into Microscopic Crystal Growth Dynamics of CHNHPbI under a Laser Deposition Process Revealed by X-ray Diffraction.

The process dynamics for the vacuum deposition of methylammonium lead iodide (MAPbI) perovskite was analyzed by X-ray diffraction using synchrotron radiation. MAPbI was fabricated by alternatingly supplying PbI and methylammonium iodide a laser deposition system installed at the synchrotron beamline BL46XU at SPring-8, and crystallization analysis was conducted. Microscopic insights into the crystallization were obtained, including observation of Laue oscillation during the PbI growth and octahedral unit (PbI) rotation during the transformation into perovskite.