This well-established monograph, updated and now in its ninth edition, deals mainly with electron transport in, and optical properties of semiconductors. It includes lasers, e.g. the quantum cascade laser, quantum processes such as the quantum Hall effect, quantum dots, fullerenes, carbon nanotubes, molecular electronics, the nitrides, and many other recent discoveries in the field. New diagrams and tables provide a comprehensive source of materials data. Selected problems help readers to consolidate their knowledge and invite teachers to use this text for graduate courses on semiconductor physics, solid state physics, and physical electronics.