Recently, a team led by Liu Shengzhong, a researcher of the Dalian Institute of Chemicals, Chinese Academy of Sciences, and Shaanxi Normal University have cooperated with Shaanxi Normal University to prepare an ultra-large single-crystal perovskite CH3NH3PbI3 crystal with a size of more than 2 inches (71 mm) for the first time. This is the world's first report of perovskite single crystals over 0.5 inches in size. Related results were published online in the "Advanced Materials" journal.

In recent years, it has been found that the methylamino halide lead material CH3NH3PbI3 (X=Cl, Br, I) with a perovskite crystal structure shows great application value in photovoltaic materials, laser materials, and luminescent materials and becomes an international One of the hot topics in materials research.

Liu Shengzhong's team developed a method for the growth of large-size perovskite single crystals and succeeded in preparing ultra-large-size single-crystal perovskite CH3NH3PbI3 crystals with sizes exceeding 2 inches (71 mm). Through high resolution X-ray diffraction and optical tests at room temperature, it was found that the CH3NH3PbI3 (X=Cl, Br, I) perovskite crystal material has a high crystalline quality and a better light absorption range (compared with thin film samples). , and for the first time found its luminescence peak at 402 nm. In addition, it has higher thermal stability than thin film materials.

An editor of "Advanced Materials" spoke highly of this work: The paper first reported a single crystal of perovskite larger than 0.5 inches in size. The perovskite single crystal shows better thermal stability, wider light absorption range, lower hole concentration, and higher carrier mobility. It can be expected that a single crystal perovskite solar cell can achieve better photoelectric conversion efficiency; at the same time, the single crystal device also has better stability due to crystal integrity and fewer defects. The editor said that since single-crystal materials are the basis of modern semiconductor industry, electronics industry and optoelectronics industry, perovskite single-crystal materials with excellent properties are likely to realize the innovation of polycrystalline perovskite-based devices and promote the use of photovoltaic devices. A new round of revolution. (Reporter Li Daqing)

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