Method for growing shape and thickness controllable ultrathin ABX3 perovskite single crystal wafers in flowing liquid-phase micro-reaction system

The invention provides a method for growing shape and thickness controllable ultrathin ABX3 perovskite single crystal wafers in a flowing liquid-phase micro-reaction system. by continuously adding fresh single crystal growth solutions into a flowing liquid-phase micro-reaction system, perovskite single crystal wafers with different shapes and thicknesses can continuously grow. The grown perovskite single crystal wafers show better thermal stability, humidity stability, wider light absorption range, small defects, low hole concentration and high carrier mobility. By perovskite solar cells prepared from the single crystal wafers, better photoelectric conversion efficiency can be obtained. Due to integrity of the crystal and small defects, single crystal devices also have better stability. As single crystal materials are the basis of the modern semiconductor industry, electronic industry and photoelectric industry, innovation of polycrystal perovskite devices can be realized through the perovskite single crystal material with excellent performance, and a new round of revolution of photoelectric devices will be promoted.