(a) What is an intrinsic semiconductor? (b) Distinguish between the p-type and n-type semi-conductors.

Assessment: WAEC SSCE - Physics - 2018 Subject: Physics

Question 1 Report

(a) What is an intrinsic semiconductor?

(b) Distinguish between the p-type and n-type semi-conductors.

Answer

p-type	n-type
Formed by doping with a trivalent impurity (e.g. boron, aluminium).	Formed by doping with a pentavalent impurity (e.g. phosphorus, arsenic).
Majority charge carriers are holes (positive).	Majority charge carriers are free electrons (negative).
The impurity is called an acceptor.	The impurity is called a donor.

p-type	n-type
Formed by doping with a trivalent impurity (e.g. boron, aluminium).	Formed by doping with a pentavalent impurity (e.g. phosphorus, arsenic).
Majority charge carriers are holes (positive).	Majority charge carriers are free electrons (negative).
The impurity is called an acceptor.	The impurity is called a donor.

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