We cover the fundamental physical principles that govern the device operation and the application. Emphasis is placed on understanding background of the individual device operation. First part of the class will cover topics include basic carrier transports in semiconductors, including conduction electrons, and holes; charge and heat transport; carrier trapping and recombination. Latter part of the class will cover novel device physics focusing MOSFET, ballistic transport, electron tunneling, single electron transistors, spin-electronics, and quantum electronics.