Why semiconductors are doped?

What are extrinsic semiconductors ? Explain how p-type and n-type semiconductors are formed ?

Classify each of the following as being either a p-type or a n-type semiconductor: Ge doped with In

Classify each of the following as being either a p-type or n -type semiconductor: B doped with Si

Classify each of the following as being either a p-type or a n-type semiconductor: Si doped with B

How does the energy gap of an intrinsic semiconductor vary. When doped with a trivalent impurity?

Why n-type and p-type semiconductors are electrically neutral?

Choose the correct options: When silicon is doped with arsenic, n-type/ p-type semiconductor is produced.