Inside Back Cover: Fluoride Chemistry in Tin Halide Perovskites (Angew. Chem. Int. Ed. 39/2021)

Abstract

The crystallization of tin‐based perovskites is improved thanks to the fluoride in SnF2. The anion of this typical additive is responsible for a more homogeneous nucleation in solution‐processed perovskite thin film formation. In addition, fluoride selectively complexes SnIV and prevents its incorporation into the perovskite structure, as reported by Jorge Pascual, Antonio Abate, and co‐workers in their Research Article on page 21583.

High-efficiency and stable FA0.75MA0.25SnI3perovskite solar cells with large-size crystal grains prepared by doping with multifunctional chloride salt

“…This is because excessive addition of C 6 H 2 (NH 2 ) 4 ·4HCl material has an adverse effect on the normal growth of crystals in the FA 0.75 MA 0.25 SnI 3 perovskite film, leading to an unnecessary phase separation. 47,48 Combined with previous related studies, we believe that excessive use of C 6 H 2 (NH 2 ) 4 ·4HCl additive will cause mutual inhibition of different crystal phases in perovskite during the growth process, ultimately leading to a large number of pinholes during the crystallization process. Phase separation can trigger unwanted carrier recombination centers, thereby affecting carrier transport within the film.…”

Suppression of Sn2+oxidation and formation of large-size crystal grains with multifunctional chloride salt for perovskite solar cell applications

“…At the same time, in previous works on Sn-based perovskites, it is suspected that Cl À can inhibit the oxidation of Sn 2+ to a certain extent, like F À . 47 Recently, chloride salt has been proven to promote the growth of perovskite grains well. Using chloride salts to produce large size grains is also beneficial to achieve higher PCE in the corresponding PSC.…”