Physics-
General
Easy
Question
A semiconductor X is made by doping a germanium crystal with arsenic (Z = 33). A second semiconductor Y is made by doping 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
- X is P-type, Y is N-type and the junction is forward biased
- X is N-type, Y is P-type and the junction is forward biased
- X is P-type, Y is N-type and the junction is reverse biased
- X is N-type, Y is P-type and the junction is reverse biased
The correct answer is: X is N-type, Y is P-type and the junction is reverse biased
Arsenic has five valence electrons, so it a donor impurity. Hence X becomes N-type semiconductor. Indium has only three outer electrons, so it is an acceptor impurity. Hence Y becomes P-type semiconductor. Also N (i.e. X) is connected to positive terminal of battery and P(i.e. Y) is connected to negative terminal of battery so PN-junction is reverse biased.
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