Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 48
49. Which of the following, when added as an impurity, into the silicon, produces $n$-type semiconductor?
(a) Phosphorous
(b) Aluminium
(c) Magnesium
(d) Both b and c
[1995]
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Answer:
Correct Answer: 49. (a)
Solution:
- (a) Phosphorous $(P)$ is pentavalent and silicon is tetravalent. Therefore, when silicon is doped with pentavalent impurity, it forms a n-type semiconductor.
