Recently, a team led by researcher Liu Shengzhong of CAS Dalian Institute of Physics cooperated with Shaanxi Normal University to prepare the super-large-size single-crystal perovskite CH3NH3PbI3 crystal with a size of more than 2 inches (71 mm) by temperature-rising crystallization method. This is the first report in the world of perovskite single crystals in excess of 0.5 inches. Relevant results published online in the "advanced materials" journal. In recent years, it has been found that CH3NH3PbX3 (X = Cl, Br, I), a permanganated lead methylate material with perovskite crystal structure, has shown great application value in photovoltaic materials, laser materials and luminescent materials, One of the hot topics in material research. Liu Shengzhong team developed large-size perovskite single crystal growth method, and successfully prepared ultra-large size single crystal perovskite CH3NH3PbI3 crystals, more than 2 inches in size (71 mm). Through high-resolution X-ray diffraction and optical tests at room temperature, it was found that the crystalline materials of CH3NH3PbX3 (X = Cl, Br, I) have high crystal quality and better light absorption range (compared with the thin film samples) , And for the first time discovered its luminescence peak at 402 nm. In addition, it has higher thermal stability than thin film materials. A chief editor of Advanced Materials spoke highly of the work: For the first time, the paper reported perovskite single crystals larger than 0.5 inch. Perovskite single crystals show better thermal stability, broader light absorption range, lower hole concentration, and higher carrier mobility. It is expected that perovskite solar cells fabricated using single crystal will achieve better photoelectric conversion efficiency, and monocrystalline devices will also have better stability due to the crystal integrity and fewer defects. The editor said that since monocrystalline materials are the foundations of the modern semiconductor industry, the electronics industry and the optoelectronics industry, perovskite single crystal materials with excellent properties are likely to revolutionize polycrystalline perovskite-based devices and promote the development of optoelectronic devices A new round of revolution