If a small amount of antimony is added to germanium crystal
it becomes a p-type semiconductor
the antimony becomes an acceptor atom
there will be more free electrons than holes in the semiconductor
its resistance is increased
n - type semiconductor -
Here the base semiconductor (e.g. pure Si or Ge) is mixed with pentavalent doping material
1) ne >>nh
2) There is donor energy level between the valence band and conduction band. Just below conduction band.
Antimony is pentavalent while germanium is tetravalent hence more free electron will be present when we add antimony as each atom of antimony will bring one extra electron in the crystal.
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