Lec 41: Extrinsic semiconductors

Addendum: In a semiconductor electrical conductivity is σ=e〖nμ〗_n+ e〖pμ〗_p. Here μ_n and μ_p are the mobilities of electrons and holes, respectively.
How doping changes the number of electrons (In n-type semiconductor) and holes (in p-type semiconductor) is discussed. The donor and acceptor energies are calculated and finally conductivity of semiconductors is discussed.
References: (i) Chapter 28: Ashcroft and Mermin
(ii) Chapter 8: Kittel