Extrinsic Semiconductors | Electronics

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One way to increase conductivity of a semiconductor is by doping.
This means adding impurity atoms to an intrinsic crystal to alter its electrical conductivity.
A doped semiconductor is called an extrinsic semiconductor.

Extrinsic Semiconductors | Electronics
Form 5 Physics KSSM Chapter 5 - Electronics

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thanx for your explanation
and exp
I ask you one question I confused
the vallence band is where electrons filled ok so where the conduction band ?
thanks

hdjamph