Reading about FETs for this week.

I would encourage you to read about FETs this week. FETs all have a source, a drain, and a gate, as far as I know. Reading about any of them is fine. MOS FETs are perhaps the most important.

Also, if you wanted to read about Schottky and Ohmic contacts that would be worthwhile. Note how the position of the Fermi energy of the metal relative to mu in the semiconductor matters. Focusing on metals contacted to an n-doped semiconductor would be fine. I think a metal Fermi level in the gap yields a Schottky contact, which is a lot like a p-n junction (but with half of it compressed to almost zero volume). A metal Fermi level above the CB edge tends to lead to an Ohmic contact, I believe, which is what you want in a lot of circumstances (e.g., where a wire meets a source or drain, or at the ends of an n-p jucntion LED or solar cell).