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The reader is introduced to some of the main points of semiconductor phenomena. Concepts of wave properties of electrons, discrete energy levels, free electrons in metals, and band theory of solids, show how semiconductors differ from metals and insulators. This is followed by a discussion of doping to create impurity conduction (n and p type), and of the relationship of conductivity to carrier concentration, life-time, and mobility.
C. A. Escoffery (1957) studied this question.