Question

Distinguish between intrinsic and extrinsic semiconductors.

Answer 1

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Answer 2

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⏺️] Intrinsic semiconductors =) A pure semiconductor ( free from any impurity ) is called an 'intrinsic' semiconductor . Its electrical conductivity , which arises by the thermal excitation of electrons from the valence band to the conduction band is called the 'Intrinsic conductivity' .

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⏺️] Extrinsic semiconductor =) 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 semiconductor is significally increased . For example , 1 impurity atom added for every 108 Ge atoms increase the conductivity of Ge to 16 times . Such impure semiconductors are called 'extrinsic' or 'impurity' or 'doped' semiconductors .

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