I'm going to disagree. It is really interesting but I think the amount of equipment, space and potentially dangerous chemicals (requiring extensive supervision

I'm going to disagree. It is really interesting but I think the amount of equipment, space and potentially dangerous chemicals (requiring extensive supervision for high schoolers) and the associated PPE and proper infrastructure to work safely aren't the best use of money/space for a high school. Old equipment also requires a lot of maintenance to keep running. You can learn about these things from a book, watching a plasma etcher or CVD furnace run isn't exactly very exciting after all. Might be worth doing a few of the simple processes but you need so much equipment to do the whole process. The lithography approach mentioned is interesting and could be cool in an undergrad/high school setting.