5.1.2 Semiconductivity The electrical conductivity of the semiconducting materials is lower than that of the metals; nevertheless,they have some unique electrical characteristics,it render them especially useful.The electrical properties of these materials are extremely sensitive to the presence of even minute concentrations of impurities.Intrinsic semiconductors are those in which the electrical behavior is based on the electronic structure inherent to the pure material.When the electrical characteristics are dictated by impurity atoms,the semiconductor is said to be extrinsic.5.1.2 Semiconductivity The electrical conductivity of the semiconducting materials is lower than that of the metals; nevertheless, they have some unique electrical characteristics, it render them especially useful. The electrical properties of these materials are extremely sensitive to the presence of even minute concentrations of impurities. Intrinsic semiconductors are those in which the electrical behavior is based on the electronic structure inherent to the pure material. When the electrical characteristics are dictated by impurity atoms, the semiconductor is said to be extrinsic