Chinese enterprises and university innovation teams have proposed innovative coating technology for solar cell material perovskite, achieving stable mass production of square meter perovskite modules and promoting the leap of perovskite technology from laboratory to large-scale application. On the 22nd, the research results were published in the journal Science. The first author and corresponding author of the paper, Yan Buyi, Chief Technology Officer of Hangzhou Xianna Optoelectronics, introduced that perovskite solar cells are the third generation photovoltaic technology, with characteristics such as flexibility and light weight, and can maintain relatively stable photoelectric conversion efficiency even on cloudy days. The core part of perovskite cells is the perovskite absorber layer, which is mainly prepared by film formation and crystallization of perovskite solution. Previous common processes were difficult to accurately control the crystal thickness and flatness, thus affecting the power generation efficiency of perovskite panels. With the support of efficiency improvement strategies and theoretical calculations at Zhejiang University and Zhejiang University of Technology, the innovative team proposed a three-dimensional laminar wind field technology, which has overcome the problem of large-area crystal uniformity in perovskite films. The three-dimensional laminar flow wind field technology is like placing a structurally complex 'range hood' on a glass substrate coated with perovskite solution. By cleverly combining spin coating technology and vacuum flash evaporation technology, the airflow is smoothly, uniformly, and directionally swept over the glass substrate, playing a drying role, thereby allowing the perovskite to crystallize more uniformly. ”Yan Buyi said that through computational fluid dynamics simulation optimization, three-dimensional laminar flow wind field technology has achieved precise control of the thickness of perovskite films, making the thickness fluctuation of perovskite films on an area of 0.79 square meters less than 3 microns. It is reported that compared with traditional processes, three-dimensional laminar flow wind field technology reduces surface defects, optimizes crystal morphology, and reduces residual solvents by 90%. According to outdoor empirical calculations, the 10-year decay rate of perovskite modules using new technologies does not exceed 10%, meeting the requirements for the service life of photovoltaic modules. In addition, the 100 MW perovskite production line built based on this technology has achieved a module yield rate of over 98.5%, with a module power of 118W per 0.79 square meters. The 500 kW commercial perovskite power station built on this basis has a unit installed capacity equivalent to 29% longer full load time than crystalline silicon modules, and generates 31.9% more electricity during high temperature seasons. Yang Yang, the head of the Department of Materials Science and Engineering at the University of California, Los Angeles and a member of the European Academy of Sciences, stated that this new technology balances efficiency, stability, production yield, and scalability, indicating that perovskite solar cell technology has the basic conditions for large-scale production. It is understood that this technology is currently expanding to scenarios such as flexible components, photovoltaic building integration, and vehicle mounted energy. (New Society)