For extrinsic semiconductors; when doping level is increased;
1
Fermi-level of p-type semiconductor will go upward and Fermi-level of n-type semiconductors will go downward.
2
Fermi-level of p-type semiconductors will go downward and Fermi-level of n-type semiconductor will go upward.
3
Fermi-level of p and n-type semiconductors will not be affected.
4
Fermi-level of both p-type and n-type semiconductors will go upward for T > TFK and downard for T < TFK, Where TF is Fermi temperature.