Which one of the following is not an acceptor impurity?
Correct answer: B. Indium
- A. Gallium
- B. Indium
- C. Boron
- D. None of these
Explanation
In semiconductor physics, impurities are classified as either donor or acceptor based on the type of charge carriers they introduce. Acceptor impurities, such as gallium and boron, introduce 'holes' into the crystal lattice, which act as positive charge carriers. Indium, on the other hand, is a donor impurity; it adds extra electrons to the lattice, resulting in negative charge carriers. Therefore, Indium is not an acceptor impurity, making it the correct answer. Gallium and Boron are incorrect because they are acceptors, and 'None of these' is incorrect because Indium does not act as an acceptor.
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A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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