Adding one more layer of metal fluoride can enhance performance of solar cells

https://phys.org/news/2022-07-adding-layer-metal-fluoride-solar.html

"thermally evaporated metal fluorides on perovskite layer... ultrathin uniform film controlled thickness adding C60 and top contact components... interlayers transparent stable, in line with inverted p-i-n solar cell requirements... magnesium fluoride interlayer effectively promoted electron extraction... reduced charge recombination at the interface. It also enhanced charge transport across the subcell... 50 millivolt increase open-current voltage and stabilized power conversion efficiency 29.3 percent"