JEE Main & Advanced Physics Semiconducting Devices Question Bank Semiconductor Diode

  • question_answer
    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  [Orissa JEE 1998]

    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

    Correct Answer: D

    Solution :

               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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