Currently, some materials are not recyclable - particularly silicon and plastic. I propose adding a second tier of the waste sorting plant - which is capable of extracting these materials. This second tier could also require extra reagents, like acid or hydrogen fluoride, to extract these resources . This would also allow the player to choose not to extract some of these resources from recyclables, letting them go to waste instead.
This would also make the basic solar power more viable, as the eventual scrapping will recover the polycrystalline silicon which is a major component.
Article on recycling PV panels:
https://www.sciencedirect.com/science/article/pii/S0959652624011090
Related ideas:
Waste sorting plant 1 could become this instead: https://ideas.captain-of-industry.com/suggestions/351768/a-mini-recycling-center-that-can-only-output-two-materials-but-is-very-cheap
Recycling plastic: https://ideas.captain-of-industry.com/suggestions/314168/plastic-recycling
