Technology

Any time you see perovskite-based cells mentioned, you can assume for the time being that it's just R&D. Perovskites are cool materials that open up a lot of neat possibilities, like cheaply inkjet-printing PV cells, but they have fundamental durability issues in the real world. When exposed to water, oxygen, and UV light, the perovskite crystals break down fairly rapidly.

That's not to say that the tech can't be made to work -- at least one lab team has developed cells with longevity similar to silicon PVs -- but somebody's going to have to come up with an approach that solves for performance, longevity, and manufacturability all at once, and that hasn't happened yet. I imagine that when they do, that will be front-and-center in the press release, rather than just an efficiency metric.