Rare-earth magnets are often used in wind turbines, but very far from always. CdTe PV is made on glass. They are common mainly in the US, mainly because of imp

Rare-earth magnets are often used in wind turbines, but very far from always. CdTe PV is made on glass. They are common mainly in the US, mainly because of import tariffs. But Cd and Te are valuable and easily extracted from panels, so, no, they will not end up in landfills. The Si ones may, but very highly-purified Si is also valuable. Thin-film cells likely to be used in future cells use very little material. So, you are reaching.