For the first time, super-sized monocrystalline perovskites have been prepared in China.

It was learned from the Chinese Academy of Sciences that a team led by Liu Shengzhong, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, cooperated with Shaanxi Normal University to prepare an ultra-large single-crystal perovskite CH3NH3PbI3 crystal with a size exceeding 2 inches (above 71 mm) for the first time using a temperature-increasing crystallization method. This is the world's first report of a single crystal of perovskite over 0.5 inches in size. The relevant results have been published online in the "Advanced Materials" journal.

Solar energy is an energy-rich and clean energy source. The rational and effective use of solar energy is an important way to solve human energy and environmental problems. At present, the use of solar energy includes solar thermal, solar photovoltaic cells, and solar hydrogen production. Among them, the solar photovoltaic power generation technology can directly convert the energy of sunlight into electricity, and can realize seamless connection with the current power supply network. It is the most convenient way of solar energy utilization.

Commercial solar cell products have a history of more than 60 years. Since they were originally limited to aerospace applications, they have now become a widely used technology. This is mainly due to the reduction in the cost of solar cell technology and the increase in human understanding of energy supply. Although the cost of solar power generation technology has been significantly reduced, it is still higher than other energy supply prices. The development of solar cell devices with high conversion efficiency and low power generation cost is a goal that humanity has been pursuing.

Studies in recent years have found that a methylamino halide lead material with a perovskite crystal structure has excellent properties such as a high light absorption coefficient, a long carrier transport distance, and a very low density of defect states. Laser materials and luminescent materials have shown great application value and have become one of the most important research hotspots in the world. At present, the photoelectric conversion efficiency of perovskite solar cells certified by the National Institute of Energy's Renewable Energy Laboratory (NREL) has reached 20.1%, which is close to the efficiency of monocrystalline silicon solar cells. At the same time, laser and light-emitting devices based on perovskite materials have also been reported, showing the broad application prospects of perovskite materials in the field of optoelectronics.

However, the perovskite solar cells and other optoelectronic devices based on microcrystalline or amorphous thin films still face enormous challenges, such as being sensitive to water vapor, insufficient stability to the atmosphere, heat, ultraviolet light, and the like. There are many crystal grains, grain boundaries, pores and surface defects in the microcrystalline perovskite film that can cause carrier recombination, which is a key issue that needs to be solved to further improve the solar energy conversion efficiency and other optoelectronic device performance.

In response to the above problems, Liu Shengzhong's research team developed a method for growing large-size perovskite single crystals and successfully prepared super-sized single-crystal perovskite crystals with a size exceeding 2 inches (71 mm). This is the first report in the world that the size exceeds 0.5. Inch perovskite single crystal.

The research team further found that the perovskite crystal material has a very high crystalline quality, a better light absorption range and a higher thermal stability compared to the thin film sample, and the luminescence peak of the material at 402 nm was found for the first time. The above research results show that this oversized single crystal has great commercial application value in the research and development of high-performance optoelectronic devices.

At the same time as the paper was published, an editor of "Advanced Materials" published a commentary on the work and gave him high praise. The review pointed out that the paper reported for the first time a perovskite crystal with a size greater than 0.5 inches, which made it possible to directly compare the difference in properties between the polycrystalline film and the single crystal. The results show that compared to polycrystalline perovskite films, single-crystal perovskite solar cells can achieve better photoelectric conversion efficiency; at the same time, single-crystal devices are also due to crystal integrity and fewer defects. Has better stability. "Because single-crystal materials are the foundation of the 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 a new revolution in optoelectronic devices. (Reporter Yan Huimin)

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