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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