Q1401
When a piece of pure silicon is doped with aluminium, then
A.
The conductivity of the doped silicon piece will remain the same
B.
The doped silicon piece will become n-type
C.
The doped silicon piece will become p-type
AnswerD.
The resistivity of the doped silicon piece will increase
Answer: Option C
Solution
Answer: Option C
Solution:
p type of semiconductor is obtained when Silicon is doped with a trivalent impurity like Aluminium. Aluminium is a p-type dopant, which means that when a semiconductor i.e. silicon is doped with aluminium, it creates a hole (positively charged carrier) by accepting an electron from the silicon atom. Electrical conductivity of semiconductors increases and resistivity remains the same.