Electron Drift Mobility in Silver Chloride

Abstract

The drift mobility of electrons in silver chloride has been measured in the temperature range 70 to 350°K. In selected crystals, multiple trapping effects are not important, and the data represent the microscopic mobility. The experimental results are compared with existing theories of mobility in polar materials. It is suggested that the microscopic mobility is determined by the interaction of longitudinal optical phonons with polarons which have a temperature-dependent mass, and a temperature-dependent coupling between the electron and the lattice. The effect of multiple trapping at lower temperatures is shown, and the results are analyzed in terms of the concentration and energy depth of a single set of shallow trapping states.