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

Explanation:

increase in the conductivity of a Semiconductor when a small amount of impurity was added to it. These materials are Extrinsic Semiconductors or impurity Semiconductors. Another term for these materials is ‘Doped Semiconductor’. The impurities are dopants and the process – Doping.

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Answer 2

Answer:

When a small amount of trivalent impurity is added to the intrinsic semiconductor then a p-type of semiconductor is obtained which means the number of holes will increase.

Explanation:

Intrinsic semiconductor: Intrinsic semiconductors are the pure type of semiconductor which means the number of electrons is equal to the number of holes in the semiconductor. There are four electrons in the outermost shell in atoms by which intrinsic semiconductor is formed, they share their electrons with each other. The electrical conductivity is very less in intrinsic semiconductors.

Addition of Trivalent Impurities: On addition of the small amount of trivalent impurities e.g Aluminium, Boron, Indium, Gallium, etc Intrinsic semiconductors can be converted into p-type semiconductors. P-type semiconductors are those in which the density of holes is more.

Trivalent impurities when added to the intrinsic semiconductor then three electrons combine with three electrons in their neighbor and one electron pair left and creates a space for the electrons. These spaces in the semiconductor are known as holes.

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