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What is Semiconductor? Semiconductor Extrinsic Semiconductor A doped semiconductor or a semiconductor with suitable impurity atoms added to it is called extrinsic semiconductor . Extrinsic semiconductors are of two types: a) N- type semiconductor b) P-type semiconductor N- type semiconductor When a pure semiconductor of Ge or Si is doped with a controlled amount of pentavalent  atoms , say arsenic or phosphorous or antimony or bismuth. We get N-type semiconductor or donor type semiconductor. It is called n-type semiconductor because the conduction of  electricity  in such semiconductor is due to  motion  of electrons i.e. negative charges, or n-type carries. It is called donor type, because the doped impurity atom donates one free electron to semiconductor for conduction. In n-type semiconductor electrons are majority carriers and holes are minority carriers. N- type semiconductor P- type semiconductor When a pure semiconductor of Ge o...