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1. What is meant by doping of an intrinsic semiconductor? Name the two types of atoms used for doping of Ge ∕ Si . 2
Solution:
Doping of an Intrinsic Semiconductor: The mixing of a small amount of pentavalent (e.g. phosphorus) or trivalent (e.g., aluminium) substance as impurity in a pure semiconductor (e.g., G e , S i ) is called doping. Doping increases the conductivity of a semiconductor.
For doping pureS i , G e , pentavalent phosphorus is used to convert it to n -type semiconductor. Trivalent aluminium is used to convert pure S i , G e to p -type semiconductor.
For doping pure
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