Define extrinsic semiconductor.
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=) The electrical conductivity of intrinsic ( pure ) semiconductors is too small to be of any practical use . If , however , a small quantity of some pentavalent or trivalent impurity is introduced into a pure semiconductor , the conductivity of the semiconductor is significantly increased . For example , 1 impurity atom added for every 108 Ge atoms increases the conductivity of Ge to 16 times . Such impure semiconductors are called extrinsic semiconductor .
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Here's , Your Answer ...
=) The electrical conductivity of intrinsic ( pure ) semiconductors is too small to be of any practical use . If , however , a small quantity of some pentavalent or trivalent impurity is introduced into a pure semiconductor , the conductivity of the semiconductor is significantly increased . For example , 1 impurity atom added for every 108 Ge atoms increases the conductivity of Ge to 16 times . Such impure semiconductors are called extrinsic semiconductor .
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