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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 ? What are deep-trap dopants? 4. How does doping affect the density of carriers in SC? 5. How to find the concentration of the minority carriers in a doped SC?

the intrinsic semiconductor, while the Fermi level of the . p-doped semiconductor is below the intrinsic Fermi level. E. 3 m * For intrinsic semiconductor we previously found: E. Fi E g k. B. T. ln v v. 2 4 m. c * For the . n-doped semiconductor in the regime when all donors are ionized we find: ni 2 nc ND, pv ND 2 E 2kBT ni P. v EF

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