I had a idea for making semiconductors using metal oxide vapor and lasers. ZnFe2O4 vapor is a n type semiconductor film that could be used to make chips by laser and vapor deposition. This might work instead of toxic chemicals. Comedore used vertical integration on production. But they left rusty tanks of useless toxic chemicals. If you negate those in manufacturing you should have a cleaner chip that is less damaging. All chemicals could be reused in laser epixy construction and make 3D chips?