This book is intended to introduce a first year graduate student of electrical engineering and/or applied physics to concepts that are critical to understanding the behavior of charge carriers ‎(‎electrons and holes‎)‎ in modern nanostructured solid state devices‎.‎ The student is assumed to have undergraduate background in solid state physics‎,‎ solid state devices‎,‎ and quantum mechanics‎.‎ Many of the topics discussed here are specific to ultrasmall ‎(‎nanostructured‎)‎ devices‎,‎ but some are more general and apply to any solid‎.‎ This material is the result of the authors teaching a graduate level introductory course on electron theory of solids in three US universities over a period spanning nearly 25 years‎.‎ It has been his experience that once students are able to grasp the concepts presented here and become comfortable with them‎,‎ they are able to handle more difficult and specialized topics quite easily‎.‎ Physics of Nanostructured Solid State Devices introduces readers to theories and concepts such as semi‎-classical and quantum mechanical descriptions of electron transport‎,‎ methods for calculations of band structures in solids with applications in calculation of optical constants‎,‎ and other advanced concepts‎.‎