New progress has been made in large-scale production of perovskite batteries

SMM: German scientists have studied the printing process of perovskite solar cells and drawn some important conclusions, which are helpful to develop "ink" materials suitable for depositing perovskite battery materials on substrates.

Although some impressive progress has been made in the research of perovskite solar cells in recent years, many of the most remarkable achievements have been made in equipment less than 1 square centimeter, and the process used is not suitable for the production of large-scale commercial equipment.

Translating these laboratory results into mass production is another research area to be solved. Many different processes have been suggested for this purpose, among which groove die coating and inkjet printing are the most frequently mentioned. These and many other methods involve the creation of an "ink" substance containing solvents and precursors, which are deposited on the matrix and then evaporated to form a perovskite crystal structure.

Understanding how the composition of this so-called "ink" affects the evaporation process and the characteristics of the crystal film is very important for the large-scale production of perovskite solar cells. Although early research has made significant progress in determining the best precursor materials for perovskite itself, the study of the formation of solvent mixtures and "ink" substances required for large-scale production is still at an earlier stage.

The study is the focus of the latest research by scientists at (HZB) at the Helmholtz Center in Berlin. "the effects of the complex effects of solvents and co-solvents in mixed perovskite precursor inks on mesophase structure and film formation kinetics are not clear," the researchers said. The kinetics of the formation of main hybrid perovskite, intermediate solvent phase and mixed solvent can be predicted by understanding the interaction between the solvent coordination intensity and the evaporation rate of the precursor solution. "

"in solvent mixtures, evaporation is dominated by the fastest and most volatile components, which changes the proportion of solvents during crystallization," the researchers said. " The formation mechanism mainly depends on the evaporation rate of the solvent and the binding strength to lead halide.

Through this study, the researchers say that the formation of crystal films can be predicted based on the combination of materials in the "ink" material. This in turn helps to design suitable "ink" substances for a range of different manufacturing processes for perovskite battery production tests. At present, there is still a lack of systematic knowledge when expanding from laboratory scale to industrial production scale, and these results can pave the way for further development of "ink" materials and improve the quality of industrial-scale production or perovskite films.