Question

To a germanium crystal equal number of aluminium and indium atoms are added. Then

• A. it remains an intrinsic semiconductor
• B. it becomes a $n$-type semiconductor
• C. it becomes a $p$-type semiconductor
• D. it becomes an insulator

Answer 1

Answer: (C)

If trivalent impurity is mixed with pure germanium crystal, the crystal so obtained is called p-type semiconductor. Here, aluminium and indium atoms are trivalent impurity atoms