The physics of semiconductors : an introduction including nanophysics and applications The 4th edition of this highly successful textbook features copious material for a complete upper level undergraduate or graduate course guiding readers to the point where they can choose a specialized topic and begin supervised research. The textbook provides an integrated approach beginning from the essential principles of solid state and semiconductor physics to their use in various classic and modern semiconductor devices for applications in electronics and photonics. The text highlights many practical aspects of semiconductors: alloys strain heterostructures nanostructures amorphous semiconductors and noise which are essential aspects of modern semiconductor research but often omitted in other textbooks. This textbook also covers advanced topics such as Bragg mirrors resonators polarized and magnetic semiconductors nanowires quantum dots multi junction solar cells thin film transistors and transparent conductive oxides. The 4th edition includes many updates and chapters on 2D materials and aspects of topology. The text derives explicit formulas for many results to facilitate a better understanding of the topics. Having evolved from a highly regarded two semester course on the topic The Physics of Semiconductors requires little or no prior knowledge of solid state physics. More than 2100 references guide the reader to historic and current literature including original papers review articles and topical books providing a go to point of reference for experienced researchers as well. Introduction Part I Fundamentals Bonds Crystals Defects Mechanical Properties Band Structure Electronic Defect States Transport Optical Properties Recombination Part II Selected Topcis Surfaces Heterostructures External Fields Two Dimensional Semiconductors Nanostructures Polarized Semiconductors Magnetic Semiconductors Organic Semiconductors Dielectric Structures Transparent Conductive Oxide Semiconductors Topological Properties of Semiconductors Part III Applications Diodes Light to Electricity Conversion Electricity to Light Conversion Transistors.