P-type semiconductor is formed when A. As impurity is mixed in Si B. Al impurity is mixed in Si C. B impurity is mixed in Ge D. P impurity is mixed in Ge
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Question

P-type semiconductor is formed when A. As impurity is mixed in Si B. Al impurity is mixed in Si C. B impurity is mixed in Ge D. P impurity is mixed in Ge

G1 Physics · Accepted Answer

P-type material requires trivalent acceptor doping. Al in Si and B in Ge are acceptor combinations; the general statement 'As impurity' is not specifically acceptor and P in Ge is donor. Correct answer: C.