Perovskites, a 'dirt cheap' alternative to silicon, just got a lot more efficient

“By using a substrate of either a layer of metal or alternating layers of metal and dielectric material—rather than glass—he and his co-authors found they could increase the perovskite's light conversion efficiency by 250%.”

https://phys.org/news/2023-02-perovskites-dirt-cheap-alternative-silicon.html