Solid comment - although rare earths are used in a minor way in the full Solar PV solution via inverters and other components.

Straight up Solar Panel grid arrays sans that stuff, it's 2,800 kg copper and 3,900 kg Silicon per MW and not much else directly (aluminium for framing, glass protection, can be added).

( Although lots of new copper (oxide ore, the most common) requires lots of new sulphur and the world has just lost 3.8 million tonnes of annual sulphur production by product from Qatar refineries )