A) arsenic and phosphorous
B) indium and aluminium
C) phosphorous and indium
D) aluminium and boron
Correct Answer: C
Solution :
\[n-\]type semiconductor is formed, when pentavalent impurities (such as antimony, arsenic, phosphorous etc.) are added to pure silicon. While \[p-\]type semiconductor is formed, when trivalent impurities. (such as aluminum, boron, indium, gallium etc.) are mixed with pure silicon. Hence, choice is correct.
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