Semiconductor Physics and Devices is a comprehensive textbook written for the undergraduate students of electronics engineering, electrical engineering, applied science, and materials science. The book first provides a summary of the basic properties of semiconductor materials, covering energy band, carrier concentration, and transport properties, emphasizing silicon and gallium arsenide. It then examines p−n diodes, bipolar transistors, MOSFETs, and other field-effect transistors such as MESFETs, MODEFTs, negative-resistance and power devices, and photonic devices and sensors, including light-emitting diodes, photodetectors, and solar cells.