Serious question: If I'm interested in getting a better understanding of the physics of semiconductors (starting around "atoms have protons and electrons" a

Serious question: If I'm interested in getting a better understanding of the physics of semiconductors (starting around "atoms have protons and electrons" and ending around "...therefore an NPN transistor should act as a switch in this setup and a current source in this setup"), where would be a good, Spears-less place to learn this?