[Pw_forum] Fermi energy in doped material.

Paolo Giannozzi giannozz at democritos.it
Wed Apr 22 12:12:22 CEST 2009

Jiayu Dai wrote:

> How could we know the heavily doped semiconductor is a metal or semiconductor? 
> Or, the fermi energy calculated is not appropriate in this case?

it depends on how "heavily" the semiconductor is doped. For doping in
the order of a few %, you can use a supercell and everything will work.
Realistic (i.e. order of magnitudes smaller) doping levels in
semiconductors cannot be simulated in this way. You have to resort to
phenomenological models in which the doping produces free charges
and the Fermi energy determines how many of them.

Paolo Giannozzi, Democritos and University of Udine, Italy

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