NEET Physics Semiconducting Devices NEET PYQ-Semiconducting Devices

  • question_answer
    If a small amount of antimony is added to germanium crystal                [AIPMT (S) 2011]

    A)  the antimony becomes an acceptor atom

    B)  there will be more free electrons than holes in the semiconductor

    C)  its resistance is increased

    D)  it becomes a p-type semiconductor

    Correct Answer: B

    Solution :

    When a small amount of antimony is added to germanium crystal, the crystal becomes n-type semiconductor because antimony is a  pentavalent substrate. It excess free electrons.


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