Cambridge Photon Technology boosts solar panel efficiency by 20%; simplest, lowest cost way

https://www.cambridgephoton.com/

"A sheet containing the dots is laid on top of a normal solar panel with no connections needed... Claim production starting in 2024 or so... Photon Multiplier Film uses advanced nanotechnology to split each incoming blue and green photon into two infra-red photons. This allows the silicon cell to capture energy that would otherwise be lost, and substantially increases its power output"