Sodium Chloride is an alkali halide with an fcc crystal structure. The basis is two ions, a sodium cation and a chlorine anion. The crystal lattice parameter is 0.563 nm. The diagram shows both a unit ...

"However, halide phase segregation originating from halogen vacancy-assisted ion migration in wide-bandgap perovskites limits the device efficiency and lifetime. We incorporate pseudo-halogen ...

Würzburg chemists have succeeded in controlling the passage of halide ions by deliberately introducing defects into a two-layer nanographene system. Their results have been published in Nature.

According to the group, chemical coordination between 4PTSC and SnI2 shields the perovskite surface, and passivates uncoordinated Sn2+ and halide ions, suppressing deep trap state formation.