Intrinsic conductivity arises from the fact that solids tend (by themselves, intrinsically ) to form lattice defects and thus enable charge movement (" ionic conduction " or " electrical conductivity ").
Lattice defects such as Schottky defects and Frenkel defects can occur in a solid . They are thermodynamically favored because they bring a gain in entropy. The system therefore tends to develop defects to a certain extent (see Defect Concentration ). These errors are known as intrinsic errors. The defect concentration is temperature dependent. It increases with temperature and has a value of zero at 0 K. Intrinsic defects consequently ensure moving charges at temperatures> 0 K and thus intrinsic conductivity.