Q.No.217: - Describe a
diode and how a pn junction is formed?
Ans: - If a piece of intrinsic
semiconductor silicon is doped so that one part is n-type and the other is
p-type, a pn junction forms at the boundary between the two regions and a diode
is created. The p-region has many holes (majority carriers) from the impurity atom and very small quantity
of thermally generated free electrons (minority carriers). The n-region has
electrons as majority charge carriers which come from impurity atoms and very
small quantity of holes which are created due to break known of bonds.
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