So the issue is that stuff like this (e.g. Fermi level pinning induced by HfO2 directly on Si without a metal gate) tends to be industry "secret" stuff and tend

So the issue is that stuff like this (e.g. Fermi level pinning induced by HfO2 directly on Si without a metal gate) tends to be industry "secret" stuff and tends to not be in textbooks. You'll usually catch this info from talking to process engineers and reading papers.