Answer:
On doping germanium with galium some
of the positions of lattice of germanium are occupied be galium. Galium atom
has only three valence electrons. Therefore, fourth valency of nearby germanium
atom is not satisfied and the place remains vacant.
This place is deficient of electrons and
is therefore .called electron hole or electron vacancy. Electron from
neighbouring atom comes and fills the hole, thereby creating a hole in its. original
position.
Under the influence of electric
field electrons move towards positively charged plates through these and conduct
electricity. The holes appear to move towards negatively charged plates.
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