This falls more into the electronics domain, which I know is sometimes put under the "semiconductor" bucket, but in universities usually has its own domain ("microelectronics" in my day). It's a lot more focused on the circuit/high frequency model of the transistor, and builds up form it.
Semiconductor theory is more about the transistor and everything below it: Starting from quantum mechanics and statistical mechanics, derive the equations of electron/hole transport in a doped semiconductor, how the material's band structure impacts current flow, etc. The derivation of the transistor equations is often the end point.
Semiconductor theory is more about the transistor and everything below it: Starting from quantum mechanics and statistical mechanics, derive the equations of electron/hole transport in a doped semiconductor, how the material's band structure impacts current flow, etc. The derivation of the transistor equations is often the end point.