Question

Which one of the following elements on doping with germanium, make it a p-type semiconductor?

• A. $Bi$
• B. $Sb$
• C. $As$
• D. $Ga$

Answer 1

The correct option is D $Ga$

When Ga is doped with germanium (or silicon - group 14 element), a p-type semiconductor is obtained. Other group 13 elements such as B and In can also be used. Here, p stands for positive.