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Organic-inorganic perovskite materials have great application prospects in optical-electrical conversion and other fields. In just 4 years, the conversion efficiency of perovskite solar cells has risen from 9% to more than 20% at present, which is close to the level of polysilicon.
The Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences has long focused on the development of new perovskite materials and large-scale preparation processes. The research team of its Energy Applications Technology Division has pioneered the use of formazan ions instead of methylamine ions to develop new perovskite materials (FAPbI3) with better band gap width and high temperature stability (Chem. Mater. DOI: 10.1021/cm404006p ). In the solution film formation process, the control effect of the precursor reaction regulation on the uniformity of the perovskite film was investigated (Phys. Chem. Chem. Phys. DOI: 10.1039/C4CP02113D; Chem. Mater. DOI: 10.1021/cm5037869 ). Based on this, Ms. Shu-Ping led the research team to develop a new gas post-repair technology in cooperation with Brown University and Xiamen Weihua Solar Energy Co., Ltd. to solve the problem of large-scale uniformity of perovskite film formation. The relevant results were published in the international The chemical journal Angew. Chem. Int. Edit. was titled Methylamine-Gas Induced Defect-Healing Behavior of CH3NH3PbI3 Thin Films for Perovskite Solar Cells. The paper was highly praised by reviewers and was edited by the journal editorial department. Selected as a VIP (Very Important Paper) article.
The large-area preparation of high-quality perovskite films is a bottleneck in the development of perovskite solar cells. The currently used solution spin coating method is only suitable for preparing a small area perovskite film. Since the perovskite material is easy to crystallize and the solvent is relatively slow to volatilize, perovskite thin films prepared based on spray, coating and other industrial techniques often have many defect structures and have poor homogeneity. Such defects can cause uneven distribution of the space electric field, thereby increasing the recombination probability of photo-generated carriers and affecting the output performance of the device.
Yu Shuping found that perovskite materials can react directly with methylamine gas to produce a liquid that can flow. Its good flow characteristics make it possible to effectively repair defective structures in the material. After repair, the gas can spontaneously desorb from the calcium by changing the external environment. Titanium ore materials. The whole process is similar to a simple breathing process. It takes only a few seconds to complete the reconstruction of the crystal structure in the perovskite film. The lattice orientation after the structure reconstitution is significantly improved, which is more conducive to the separation and transport of carriers inside the perovskite film.
This kind of gas repair process also showed superior repair ability on the large-area perovskite film prepared by the slit coating process. The partner, Xiamen Weihua Solar Energy Co., Ltd., proved that the gas repair process is not affected by factors such as size and base material. The limitation is that large-scale uniform perovskite films can be prepared, and 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 its core intellectual property rights.
The study was supported by the Chinese Academy of Sciences Youth Promotion Association (2015167), the National Natural Science Foundation of China (51202266), the Shandong Province Natural Science Foundation Project (No. ZR2013FZ001), and the Qingdao City Applied Basic Research Project (14-2-4-8- Jch) and the Qingdao Institute of Energy Storage Technology Funding.
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