A) holes
B) electrons
C) Both and
D) None of the above
Correct Answer: A
Solution :
When an impurity atom with 3 valence electrons is introduced is a pure semiconductor. All the three of its valence electrons form covalent bonds with one each valence electron of the nearest pure semiconductor (say germanium) while one is not able to form a bond, giving rise to hole which acts as charge carrier in a p-type semiconductor crystal.
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