The material itself is not the problem I’m concerned about. The metal gets doped and transformed into configurations that could be hard to be unmade.
https://www.epa.gov/hw/solar-panel-recycling
https://www.firstsolar.com/Solutions/Recycling
> One kilogram of First Solar’s semiconductor material can be recycled 41 times over, which translates into a use time of more than 1,200 years.