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#### CHAPTER 14 SEMICONDUCTORS

Conductivity of an extrinsic semiconductor

The crystal as a whole is neutral.

In a doped semiconductor

where ne and nh are the number density of electrons and holes and ni is number density of intrinsic carriers, i.e., electrons or holes.

Electrical conductivity of extrinsic semiconductor is given by

Where ρ is resistivity, μe and μh are mobility of electrons and holes respectively.