PREFACE This Textbook is intended for upper division undergraduate and graduate courses. As a prerequisite, it requires mathematics through differential equations, and modern physics where students are introduced to quantum mechanics. The different Chapters contain different levels of difficulty. The concepts introduced to the Reader are first presented in a simple way, often using comparisons to everyday-life experiences such as simple fluid mechanics. Then the concepts are explained in depth, without leaving mathematical developments to the Reader's responsibility. It is up to the Instructor to decide to which depth he or she wishes to teach the physics of semiconductor devices. In the Annex, the reader is reminded of graphy and qu mechanics which they have seen in lower division materials and physic courses. These notions are used in Chapter I to develop the Energy band Theory for crystal structures An introduction to basic Matlab programming is also included in the Annex, which prepares the students for solving problems throughout the text. Matlab was chosen because of its ease of use, its powerful graphics capabilities and its ability to manipulate vectors and matrices. The problems can be used in class by the Instructor to graphically illustrate theoretical concepts and to show the effects of changing the value of parameters upon the result. We believe it is important for students to understand and experience a" hands-on"feeling of the consequences of changing variable values in a problem(for instance, what happens to the C-v characteristics of a MOs capacitor if the substrate doping concentration is increased?- What happens to the band structure of a semiconductor if the lattice parameter is increased?-What happens to he gain of a bipolar transistor if temperature increases? ) FurthermorePREFACE This Textbook is intended for upper division undergraduate and graduate courses. As a prerequisite, it requires mathematics through differential equations, and modern physics where students are introduced to quantum mechanics. The different Chapters contain different levels of difficulty. The concepts introduced to the Reader are first presented in a simple way, often using comparisons to everyday-life experiences such as simple fluid mechanics. Then the concepts are explained in depth, without leaving mathematical developments to the Reader's responsibility. It is up to the Instructor to decide to which depth he or she wishes to teach the physics of semiconductor devices. In the Annex, the Reader is reminded of crystallography and quantum mechanics which they have seen in lower division materials and physics courses. These notions are used in Chapter 1 to develop the Energy Band Theory for crystal structures. An introduction to basic Matlab programming is also included in the Annex, which prepares the students for solving problems throughout the text. Matlab was chosen because of its ease of use, its powerful graphics capabilities and its ability to manipulate vectors and matrices. The problems can be used in class by the Instructor to graphically illustrate theoretical concepts and to show the effects of changing the value of parameters upon the result. We believe it is important for students to understand and experience a "hands-on" feeling of the consequences of changing variable values in a problem (for instance, what happens to the C-V characteristics of a MOS capacitor if the substrate doping concentration is increased? - What happens to the band structure of a semiconductor if the lattice parameter is increased? - What happens to the gain of a bipolar transistor if temperature increases?). Furthermore