Page "Fermi level" Paragraph 35

If a semi-conducting body " B " is electrically connected to Earth, in circumstances where there is no battery or equivalent in the system, then the Fermi level of body " B " is locked to the Fermi level of the Earth.

In these circumstances, changes in doping in the semiconductor cause shifts in energy of the whole band structure of body " B ", relative to the common Fermi level of the Earth and body " B ".

In these circumstances doping ( or changes in doping ) also causes some transfer of charge between body " B " and the Earth.