Electronic Structure of Semiconductors
The subject of the electronic structure of solids is quite extensive and cannot be exhausted in few lectures. Advances in this field have been enormous in the last few years, both in the development of new theoretical approaches and in the application of sophisticated experimental techniques. My aim in this chapter is to give an introduction to the topic of the electronic structure of crystalline semiconductors, mainly emphasizing important concepts, rather than technical details. To this end I have done a rather personal selection of topics, having in mind the illustration of the basic concepts and problems, whose appreciation is required to understand the behavior of the valence electrons in semiconductors. The exposition falls into two parts, the first being devoted to the one electron description of the electronic structure and the second going into the problems of the many body effects in pure and extrinsic materials. The aim of the first part is to provide a general background about the semiconducting phase of a crystal, i.e. the main features of the chemical bond, the mechanism responsible in its formation and the quantities of interest in studying transport properties. The level of the second part is a little higher: many body theory is considerably more complicated than the independent particle description.
KeywordsConduction Band Band Structure Dielectric Function Charge Density Wave Single Particle Excitation
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