In recent years, perovskite materials have garnered significant interest in photovoltaics and other optoelectronic applications due to their remarkable photoelectric properties and the ease with which they can be processed through solutions. Currently, the highest power conversion efficiency achieved by organic-inorganic hybrid perovskite solar cells has surpassed 25%, placing them on par with commercial polysilicon solar cells. However, enhancing both the efficiency and stability of these devices remains crucial for their commercial viability.
The research group led by Professor Song Yanlin at the Green Printing Institute of Chemistry, Chinese Academy of Sciences, has been actively exploring the fabrication and performance optimization of organic-inorganic hybrid perovskite solar cells. They employed an organic cation substitution approach to achieve an in-situ transformation from one-dimensional to three-dimensional perovskites, resulting in large-area, high-quality perovskite films that significantly boosted the photovoltaic performance of the devices (Adv. Mater. 2018, 30, 1804454). Additionally, they successfully liquefied the perovskite film using methylamine gas and controlled its evaporation to form a large-area perovskite film consisting of millimeter-sized single-crystal perovskite grains on a titanium dioxide substrate, marking a groundbreaking achievement (Nat. Commun. 2020, 11, 5402). Furthermore, advancements have been made in improving the performance and stability of tin-based perovskite batteries (Angew. Chem. Int. Ed. 2019, 58, 6688).
Given the presence of organic cations in organic-inorganic hybrid perovskites, which often leads to poor thermal stability and negatively impacts the device's photovoltaic performance and lifespan, replacing these organic components is of great importance. Recently, the team has made notable strides in preparing all-inorganic lead perovskite films and studying photovoltaic cells. Utilizing PbI2, CsI, and dimethylammonium iodide (DMAI) as precursors, they fabricated CsPbI3 perovskite films via vacuum-assisted thermal annealing. By carefully regulating the environmental pressure during the annealing process, they balanced the generation and release rates of organic by-products during the perovskite film transformation. This strategy facilitated nucleation and crystallization, reduced the density of defect states within the film, and enhanced carrier lifetimes, ultimately leading to a marked improvement in device performance. The power conversion efficiency rose from 17.26% to 20.06%, and the battery's stability was significantly enhanced.
These findings were published in Angewandte Chemie International Edition. The research received support from the National Natural Science Foundation of China, the Ministry of Science and Technology, the Chinese Academy of Sciences, and the Beijing Natural Science Foundation.
Preparation of perovskite films and solar cell properties by vacuum-assisted thermal annealing. This image illustrates the process and outcomes of the innovative techniques developed by the research team, highlighting their contribution to advancing perovskite technology.
Yuyao Shuguang stainless steel bearing Co., LTD , https://www.shuguangbearing.com