The Combined Nomenclature (CN), v1:2020
3818: Chemical elements and compounds doped for use in electronics, in the form of discs, wafers, cylinders, rods or similar forms, or cut into discs,
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/kn?id=9c320fe0-a022-4f6f-9b66-776ab8be79ca