Question

Fermi level in n type semiconductor at 0kelvin temperature

Answer 1

Fermi level determines charge carrier population according to the integral over density of states times Fermi Dirac distribution. Therefore, saying that the position of Fermi level is higher (lower), relative to middle of band gap, is just the mathematical description of saying you have more electrons (holes), relative to the intrinsic state, in the system. Dopants in the system increase the concentration of electrons or holes.

Answer 2

Answer:

So, the Fermi energy does not change with temperature. The Fermi level is the chemical potential of a system of electrons in a solid, which depends on temperature. The chemical potential is the energy required to add a particle to a system in thermodynamic equilibrium, which can change with temperature.