A US-British research team reported that they used a new method to process and manufacture perovskite solar cells, which have a photoelectric conversion efficiency close to traditional silicon-based solar cells, but at a much lower cost. Perovskite materials refer to a class of ceramic oxides, named after their earliest discovery in natural perovskites. Solar cells can be made of perovskite materials, and the photoelectric conversion efficiency is high. In recent years, the scientific community has been optimistic about its prospects. However, it also has the disadvantages of unstable performance and susceptibility to decay. There has been no mature product.
Researchers at Stanford University and the University of Oxford in the United Kingdom used tin to mix lead, antimony, iodine, and other commonly used substances to create new perovskite materials. Compared with the current single-crystal silicon solar cell material, this perovskite material is thinner, more flexible, and cheaper.
According to reports, they designed a new power generation facility consisting of two series-connected perovskite solar cells, which can convert solar energy into electricity at an overall efficiency of 20.3%. The photoelectric conversion efficiency is close to the current market. Silicon-based solar cells.
Researchers say that perovskite solar cell tandem devices cost less. The production of silicon-based solar panels first needs to be processed into monocrystalline silicon. The process requires a high temperature of 1600 degrees Celsius. While manufacturing perovskite solar cells, it is possible to process common materials such as tin and lead in the laboratory, and then spray the glass at room temperature. on.
The stability of perovskite materials has always been a problem. Silicon-based solar panels installed on rooftops can typically last 25 years or more, but some perovskite materials degrade quickly in wet or light environments. Previous experiments have shown that perovskite materials made of tin are particularly unstable.
The researchers placed a perovskite solar cell made of tin mixed with various materials and a perovskite solar cell made of tin in a 100 degree Celsius environment for 4 days, and found that the former had thermal stability and air stability. Very good, the latter never had.
The research results were published in a new issue of the journal Science. Michael McGee, a professor of materials science and engineering at Stanford University, one of the research leaders, said that perovskite materials are promising for the production of high-efficiency solar cells while reducing manufacturing costs. Another person in charge, Henry Sneath, professor of physics at the University of Oxford in the United Kingdom, also believes that perovskite solar cells have many advantages, and that if the manufacturability and stability are proven, it will bring about changes in the photovoltaic industry.
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