When a pentavalent impurity is added to a pure semiconductor, it becomes?
A
a p-type semiconductor
B
an n-type semiconductor
C
an insulator
D
an intrinsic semi-conductor
Verified Correct Answer: B.
Physical Principles & Numerical Solution
When a pentavalent (5 outer electron)atom is added to a pure semiconductor, there is an extra electrons which does not take part in the covalent bonding resulting in an n-type semiconductor.
Source: WAEC / JAMB / NECO Classroom Archive (Record #14269)