Hi all
Greetings. I have calculated the fermi energy of material from HOMO-LUMO levels obtained from gaussian results.
HOMO (eV) LUMO (eV) ENERGY GAP (eV) FERMI ENERGY (eV)
-5.85 -2.03 -3.81 -3.94
What does this fermi energy indicate?
Dear Rahul,
Fermi Energy is the term used to describe the top of the collection of electron energy levels at absolute zero temperature. This concept comes from Fermi-Dirac statistics. Electrons are fermions. So, they cannot exist in identical energy states because of the Pauli exclusion principle. Hence, at absolute zero they pack into the lowest available energy states and build up a "Fermi sea" of electron energy states. The Fermi level is the surface of that sea at absolute zero where no electrons will have enough energy to rise above the surface.
Dear Rahul,
Fermi Energy is the term used to describe the top of the collection of electron energy levels at absolute zero temperature. This concept comes from Fermi-Dirac statistics. Electrons are fermions. So, they cannot exist in identical energy states because of the Pauli exclusion principle. Hence, at absolute zero they pack into the lowest available energy states and build up a "Fermi sea" of electron energy states. The Fermi level is the surface of that sea at absolute zero where no electrons will have enough energy to rise above the surface.
The position of Fermi level can also determine whether the material is intrinsic or extrinsic semiconductor. If it is n-type semiconductor, the fermi level position is near to the conduction, while for p-type semiconductor, fermi level position is near to the valence band. According to your results, your material is intrinsic semiconductor in which fermi level located in the center of the band gap energy.
- Badges
- Science topic