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Conductivity in semiconductors. Engineering conductivity ...

Lecture 17. Conductivity in semiconductors . Engineering Conductivity through doping. Today: 1. semiconductors under applied electric field. Origins of Conductivity . 2. Evanescent states inside the bandgap. 3. Impurities in semiconductors . 4. Engineering Conductivity through doping. 5. Carrier densities in p- and n-doped semiconductors . 6. Fermi level in doped semiconductors . Questions you should be able to answer by the end of today's lecture: 1. What carriers participate in conduction in semiconductors ? How does conduction in a semiconductor differ from a metal? 2. What is the physical significance of evanescent states inside the bandgap? 3. What are dopants? What dopants are used to make p-type and n-type semiconductors ?

Which results in the electron conductivity of the material: e. ne m *. e. However, we forgot an important detail, in semiconductors the conduction may happen via electrons or holes, which means we have to add the hole conductivity to obtain the total conductivity of our semiconductor: n. n. c ee pv h c p. ve mc * m v * e n m. c * e, h p m. v ...

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