Question

Which of the following, when doped into ultrapure germanium, will convert it into a p-type semiconductor?

• A. $C$
• B. $As$
• C. $In$
• D. $Na$

Answer 1

Answer: (C)

$In$

When a pure semiconductor is doped with trivalent elemental impurity $p$ type semiconductors are formed

(A) $C⟶Tetravalent$

(B) $As⟶Pentavalent$

(C) $Indium$ $\left(In\right)⟶$ $Trivalent$

(D) $Na⟶$ $Monovalent$

Thus Indium ($In$) will convert ultrapure germanium into p-type semiconductor.