Chinese Academy of Sciences successfully developed perovskite film large area repair technology
Organic-inorganic perovskite materials have great application prospects in the fields of light-electricity conversion and the like. In just four years, perovskite solar cell conversion efficiency increased from 9% to more than 20%, is close to the level of polysilicon. Chinese Academy of Sciences, Qingdao Institute of Bioenergy and Process for a long time focused on the new perovskites materials and large-scale preparation technology development. Its energy application technology branch of the research team has taken the lead in the use of amidine ion instead of methylamine ion developed with better bandgap and high temperature stability of the new perovskite material. In the solution-forming process, the regulation of the precursor reaction to improve the uniformity of the perovskite film is discussed. On this basis, Shu-Ping Le led the research team and the United States Brown University, Xiamen, but Huaguang energy companies to develop a new gas after-repair technology to solve the problem of large-scale perovskite film formation, the relevant results published in the international The journal Chemhut. Chem. Int. Edit., Entitled Methylamine-Gas Induced Defect-Healing Behavior of CH3NH3PbI3 Thin Films for Perovskite Solar Cells, was highly praised by reviewers and was selected by the journal editorial office VIP (Very Important Paper) article. Large-area preparation of high-quality perovskite thin films is the bottleneck in the development of perovskite solar cells. Currently used solution spin-coating method is only suitable for the preparation of a small area of ​​perovskite film. Perovskite films prepared by industrial techniques such as spraying and coating usually have more defect structures due to the tendency of perovskite materials to easily crystallize and the solvent to volatilize relatively slowly, and the uniformity is poor. Such defects will cause the uneven distribution of the space electric field, thus increasing the compound probability of photogenerated carriers and affecting the output performance of the device. Shu Shuping study found that perovskite material can react directly with methylamine gas to produce a liquid can flow, and its good flow properties make it can effectively repair the defect structure of the material, repaired by changing the external environment so that the spontaneous release of calcium gas Titanium materials. The whole process is similar to a simple breathing process, and it takes only a few seconds to complete the reconstruction of the crystal structure in the perovskite film. And the lattice orientation after the structure reconstruction has been significantly improved, which will be more conducive to the carrier in the perovskite film separation and transmission. This kind of gas recovery process also shows super repair ability on the large-area perovskite film prepared by the slit coating process. The partner Xiamen Huahuang Photovoltaic Co., Ltd. proves that the gas recovery process is not affected by the size, base material and other factors , A high-uniformity perovskite film can be prepared on a large scale. This process makes it possible to develop large-area, high-efficiency perovskite solar cells. Based on this, Qingdao Energy has applied for patent protection of core intellectual property. The research was supported by the Chinese Academy of Sciences Youth Promotion Association, the National Natural Science Foundation of China, the Shandong Provincial Natural Science Foundation of key projects, Qingdao City, applied basic research project and Qingdao Institute of Energy Storage Technology funding. Silicone Rubber Sealing Strip,Channel Light Strips,Container Door Gasket,Rubber Seal Gasket HEBEI JIEXING RUBBER SEALS CO.,LTD , https://www.jiexingrubber.com