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

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

"gold that has lost 2 negatively charged electrons, denoted Au2+... halide perovskite, quick, simple, room temperature... applications that require magnetism and conductivity as electrons hop from Au2+ to Au3+ in the perovskite: more-efficient solar cells, light sources, and electronics components"