When a small amount of impurity atoms are added to a semiconductor then generally its resistivity

Step-by-step solution

When a small amount of impurity atoms is added to a semiconductor, the process is known as doping. Doping significantly increases the number of charge carriers (either free electrons or holes, depending on the type of impurity) in the semiconductor. The conductivity of a semiconductor is given by = e(n_e _e + n_h _h) , where n_e and n_h are the number densities of electrons and holes respectively. Since the number of charge carriers increases, the conductivity of the semiconductor increases. Resistivity is the reci