Conductivity and Resistivity of Semiconductor #8211; (i) The conductivity, which is reciprocal of resistivity is given by, [ρ = 1/e(n<sub>e</sub> μ<sub>e</sub> + n<sub>h</sub> μ<sub>h</sub>] (ii) The resistivity of a semiconductor is given by, (ρ = AR/l)