Things to remember about semiconductors

[physicsexpert]

1. Resistance of a pure semiconductor is millions and millions of
times greater then that of a good conductor like copper.
2 Charge carriers in semiconductors are electrons(-e) and holes(p
having charge equal to +e).
3 Pure semiconductor known as intrinsic semiconductor contains equal
number of both holes and electrons.
4 Drift velocity of electrons is greater then that of holes.
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