First slide
Classification of semi-conductors
Question

An intrinsic semiconductor is converted into n-type extrinsic semiconductor by doping it with

Very Easy
Solution

When intrinsic semiconductor (Si or Ge) is doped with a pentavalent element, e.g. phosphorus (P), a n-type extrinsic semiconductor is created because
pentavalent dopant donates one extra electron for conduction.

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