Optical concentrator could help solar arrays capture more light, even on a cloudy day, without tracking the sun

https://techxplore.com/news/2022-06-optical-solar-arrays-capture-cloudy.html

"layered together different glasses and polymers that bend light to different degrees, creating what's known as a graded index material. The layers change the light's direction in steps instead of a smooth curve, which the researchers found to be a good approximation of the ideal AGILE. The sides of the prototypes are mirrored, so any light going in the wrong direction is bounced back towards the output"

Related: Suspended solar panels see the light

https://techxplore.com/news/2024-03-solar-panels.html