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A semiconductor X is made by dopping a g...

A semiconductor `X` is made by dopping a germanium crystal with arsenic `(Z=33)`. A scond semiconductor `Y` is made by dopping germanium with indium `(Z=49)`. The two are joined end to end and connected to a battery as shown. Which of the following statements is correct?

A

X is P-type, Y is N-type and the junction is forward biased

B

X is N-type, Y is P-type and the junction is forward biased

C

X is P-type, Y is N-type and the junction is reverse biased

D

X is N-type, Y is P-type and the junction is reverse biased

Text Solution

Verified by Experts

The correct Answer is:
D
Arsenic has valence five and indium has valeance three. So X is N-type and Y is p-type. As positive terminal of battery is connected to N-type, and negative terminal to p-type of P-N junction, hence the junction is reverse biased.
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