The solar cell industry is the focus of international high-tech industry competition. Compared with traditional silicon crystal solar cells, flexible lightweight thin-film perovskite solar cells are based on thin-film solar cells that can be bent, folded, and low in weight. Because of their high efficiency, low cost, and simple preparation process, they have become a leading technology in the solar cell industry. One of the most disruptive competitors. Although perovskite solar energy has the advantages of low cost and high conversion efficiency, this technology also has the disadvantages of decay when exposed to water and poor durability. In addition, the battery contains the toxic substance lead, which will be discharged into the environment when dissolved in water. It can be said that there are advantages and disadvantages. Now, many scientists want to create lead-free perovskite technology that does not affect conversion efficiency, such as trying to replace lead with tin, germanium, bismuth, antimony, copper and manganese. A research team pointed out that tin has the greatest application potential. Its external electron shell structure is similar to that of lead, and its ionic radius is also relatively small. This allows the material to not affect the lattice structure during bonding. Currently, some teams have also tested various types of tin Arrangements and combinations of perovskites, such as combining tin with metals such as cesium, create new perovskite layers. Flexible perovskite solar cells can meet some of the special needs of near space equipment in special aerospace, special field information equipment, solar-powered drones, high-altitude exploration equipment, and a wide variety of consumer electronics such as mobile phones. The research team hopes to mass-produce it as soon as possible and contribute to the development of civil emergency, special, and green urban landscape lighting. Recently, the Nano-Control and Biomechanics Laboratory of the Institute of Medical Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, has made new progress in the research and development of flexible perovskite solar cells. The relevant research results are titled "Realizing highly flexible, stable and efficient flexible perovskite solar cells through van der Waals epitaxy technology on mica substrates" and were published online in "Nano Energy". In 2019, major breakthroughs were made in the development of flexible electronics technology, and the technology research and development of flexible perovskite solar cells also made certain progress. At this year's Xi'an Jiaotong University's first scientific and technological achievements press conference, there was already a precedent for the flexible perovskite solar cell developed by Professor Wu Chaoxin and his team from the School of Telecommunications of Xi'an Jiaotong University, with an efficiency exceeding 22%. Currently, flexible wearable electronics has become a trend in the development of electronic components. Flexible batteries are the focus of research and development as well as technical difficulties. The power supply has great limitations on the outdoor usability, large-area fit and safety of wearable electronics. As the demand for wearable electronics continues to increase, flexible solar cells have received increasing attention. The substrates currently used for the preparation of flexible devices are mainly polymer substrates. When the critical bending radius is reached, the transparent conductive layer breaks, resulting in severe attenuation of the photoelectric performance. At the same time, water molecules can easily pass through the polymer substrate, affecting Mechanical and long-term stability of perovskites in batteries. To solve the above problems, a joint research team from the Laboratory of Nanoregulation and Biomechanics, Shijiazhuang Railway University and Taiwan Chiao Tung University developed a highly flexible, stable and efficient perovskite solar cell (PSC) on a transparent mica substrate. Its optimal photoelectric conversion efficiency (PCE) is 18.0%; the bending radius is as small as 5mm, and it maintains 91.7% of the original efficiency after 5,000 bending cycles. Its excellent performance is mainly due to the van der Waals force between the mica layers, which reduces the mechanical constraints of the substrate on the PSC device, giving it higher mechanical bending performance.

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