Project Description: An important "revolution" in the field of solar cells. In just 5 years, perovskite solid-state solar cells have certified conversion efficiency of 22.1%. It transcends the decades-old development process of other types of batteries. Its high efficiency, low cost, and simple preparation process make it the most disruptive competitor in the solar cell industry. Perovskite solar cells are solar cells that use perovskite-type organic metal halide semiconductors as light-absorbing materials. They belong to the third generation of solar cells and are also called new concept solar cells. The perovskite solar cell studied in this project: a solar cell with a perovskite structure of methylamine lead iodine (such as MAPbI3) as the absorption layer. Methylamine lead iodine is a direct band gap semiconductor material with broad absorption spectrum, strong absorption and long carrier transmission distance.  Innovative: This project focuses on the bottleneck of the industrialization of perovskite thin film solar cells, invented a unique perovskite preparation process method, mastered the uniform preparation technology of large-area perovskite thin films, and has independent independent intellectual property rights. The study studied the preparation of large-area perovskite films by the "evaporation/solution composite method". The evaporation (PbI2)/solution (MAI) method perfectly realized the problem of uniformity of large-area perovskite films, and the entire process It is completed at low temperatures (below 80 degrees), which is especially suitable for the preparation of flexible thin film solar cells. At the same time, the process is compatible with existing vacuum equipment and processes, solving the problem of difficulty in industrialization of test results. At present, the best perovskite cell conversion efficiency is 19.6% in the laboratory, and the efficiency of flexible thin film solar cells exceeds 17%.  Prospects: The main application areas of lightweight flexible thin film solar cells (flexible) include: outdoor multifunctional charging power supplies; battery backup charging systems for consumer electronics; new energy aircraft, automobiles, etc. Such as the "Sunshine 2" solar-powered aircraft and new sun-powered vehicles; military uses (individual soldier informatization field power supply supplement, near space airships and other power sources; urban landscape power supplement; distributed intelligent building power supply and power generation systems.