**Striking rare gold: Researchers unveil new material infused with gold in an exotic chemical state**

For the first time, Stanford researchers have found a way to create and stabilize an extremely rare form of gold that has lost two negatively charged electrons, denoted Au2+. The material stabilizing this elusive version of the valued element is a halide perovskite—a class of crystalline materials that holds great promise for various applications including more-efficient solar cells, light sources, and electronics components.

https://phys.org/news/2023-09-rare-gold-unveil-material-infused.html