Question

if an intrinsic semiconductor is doped with a very small amount of trivalent impurity then in the extrinsic semiconductor so formed the number of holes will _________ . OPTIONS ARE:- DECREASE, INCREASE, REMAINS SAME, NOT SPECIFIC​

Answer 1

Answer:

When a small amount of impurity is added to a pure semiconductor, ... Also, due to recombination, the number of holes reduce further. ... But, the number of these electrons is very small.

Answer 2

The number of holes will increase.

• Here, there is doping of trivalent impurities in intrinsic semi-conductor which gives rise to a p-type semiconductor.
• In p-type semi-conductor, majority charge carrier is holes and minority is electrons.
• Electrons are minority charge carriers, there is a deficiency of electrons in the semiconductor which gives rise to an increase in holes.
• Here trivalent impurities such as Aluminium, Boron, Indium, etc are added into silicon(intrinsic semiconductor).