Se

Semiconductor's conductivity is a typical Phenomenon. When an intrinsic substrate gone through one of the doping process, which uses trivalent or pentavalent impurity, the conductivity of the whole material increases abruptly. The eV b/w valence and conduction band decreases significantly. Depending upon the application we have to select which type of doping would be suitable as the carriers lifetime throws much impact when the substrate go to further processing in the pipeline. As of now Ge is discarded and is not being used for many years, Si is dominant and playing its role from pn junction diode to ulsi devices.