Application of percolation theory to the jump conductivity of a disordered sehiconductor

A percolation problem arises in calculating the jump conductivity of a disordered semiconductor, and this is considered as determination of the critical density of the bonds between centers ϑc. Exact limits are obtained for the critical mean bond density, and an approximation calculation is performed via the procedure that takes into account the energy dependence of the mean number of bonds for an individual center.