Progress in the preparation of inorganic perovskite batteries

　　Recently, Song Yanlin's research group from the Institute of Chemistry, Chinese Academy of Sciences has made new progress in the preparation of all-inorganic lead perovskite thin films and the research of photovoltaic cells, which has improved the photovoltaic performance of the device and improved the stability of the battery
.

　　The researchers used lead iodide, cesium iodide and dimethylammonium iodide as precursors, and prepared cesium triiodide lead acid (CrPbI3) perovskite films by vacuum-assisted thermal annealing
.
By adjusting the environmental pressure during the annealing process, they can balance the generation and release rates of organic by-products during the transformation of perovskite films, promote the nucleation and crystallization of perovskites, reduce the density of defect states in the film and improve the carrier lifetime, The photovoltaic performance of the device is significantly improved, the photoelectric conversion efficiency is increased from 17.
26% to 20.
06%, and the stability of the battery is significantly improved
.

　　Previously, the research group has carried out research on the preparation and performance of organic-inorganic hybrid perovskite solar cells.
The organic cation replacement method is used to realize the in-situ conversion of one-dimensional to three-dimensional perovskite, and obtain large-area and high-quality perovskite solar cells.
With perovskite thin films, the photovoltaic performance of the device has been significantly improved
.
They also used methylamine gas to liquefy the perovskite film, and then controlled the volatilization of methylamine gas to form a large-area perovskite film composed of millimeter-scale single-crystal perovskite grains on a titanium dioxide substrate for the first time
.

　　In recent years, perovskite materials have attracted attention in optoelectronic fields such as photovoltaics due to their excellent optoelectronic properties and solution processability
.
At present, the highest photoelectric conversion efficiency of organic-inorganic hybrid perovskite solar cells has exceeded about 25%, which is comparable to the performance of commercial polycrystalline silicon solar cells.
Further improving the device efficiency and stability is the key to commercialization of perovskite cells
.
Due to the presence of organic cations in organic-inorganic hybrid perovskites, the thermal stability of the films is poor, which affects the photovoltaic performance and lifetime of the devices
.
It is of great significance to prepare all-inorganic perovskite batteries with inorganic cesium ions instead of organic cations
.