A US-British research team reported that they process the perovskite solar cells in a new way to make their photoelectric conversion efficiency close to that of traditional silicon-based solar cells, but at a much cheaper cost. Perovskite materials can be made into solar cells, photoelectric conversion efficiency is high, the scientific community has been optimistic about its prospects in recent years. But it also has instability, easy to decay defects, there has been no mature product. Researchers at Stanford University in the United States and Oxford University in the United Kingdom use lead to mix lead, cesium, iodine and other commonly used substances to create new perovskite materials. Compared with the current single crystalline silicon solar cell material, the perovskite material is thinner, more flexible and cheaper. According to reports, they designed a new power plant made up of two tandem all-perovskite solar cells capable of converting solar energy into electricity at a combined efficiency of 20.3%. The photoelectric conversion efficiency is now near the market Silicon-based solar cells. Researchers say the perovskite solar cell tandem devices cost less. Production of silicon-based solar panels first need to be processed into single-crystal silicon, the process requires a high temperature of 1600 degrees Celsius, and the manufacture of perovskite solar cells in the laboratory can be tin, lead and other common material processing, and then sprayed at room temperature glass on. The stability of perovskite materials has always been a problem. Roof-mounted, silicon-based solar panels typically take 25 years or more, but some perovskite materials degrade rapidly in humid or light conditions. Previous experiments have shown that perovskite materials made from tin are particularly unstable. The researchers placed their perovskite solar cells made of a mixture of tin and perovskite solar cells made of tin for four days at 100 degrees Celsius and found the former's thermal and air stability Very good, the latter has never had. The research results published in the new issue of "Science" magazine.