Things to remember

Fermi Level:
Fermi level, E_F, is a chemical energy of a material. It is used to describe the energy level of the electronic state at which the electron has a probability of 0.5 ocuppying that state.
It is given as:
E_F=1/2[E_C+E_V]-(4/3)*KT*ln(m_n^*/m_p^*)