Question

To get a $n-$type semiconductor from silicon, it should be doped with a substance with valence _______.

• A. 2
• B. 1
• C. 3
• D. 5

Answer 1

The correct option is D 5

An $n-$type semiconductor is made by adding a small amount of a Group-V element such as phosphorous ($P$) or arsenic ($As$) to the intrinsic semiconductor. Group-V elements have five valence electrons per atom.

So, correct answer is option $D$.