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How are p-type n-type semiconductors for...

How are p-type n-type semiconductors formed ?

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p-type : When pure/intrinsic semiconductor (germanium/sillicon) is doped with trivalent impurity (indium, gallium, aluminum, boron). n-type : When pure/intrinsic semiconductor (germanium/sillicon) is doped with pentavalent impurity (phosphorous, arsenic, antimony,bismuth).
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