Sam Zeloof did a great talk about his home IC foundry at the Hackaday Supercon 2019. This slide shows an overview of the process: A series of masks is used to build up a 3 dimensional structure on the wafer. Each step is fundamentally the same: Deposit a layer of silicon dioxide (glass) on the surface of the wafer Coat the glass with photoresist (which is a light sensitive organic compound, similar to photographic emulsion) Bake it Use a mask to cover certain areas and use light (often UV) to...
