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Electrical properties of two-source evaporated polycrystalline films

The compositional dependence of electrical properties such as thermoelectric power, carrier concentration and conductivity, of two-source vacuum evaporated polycrystalline thin films were investigated. The temperature dependence of conductivity was studied in the range 100 - 400 K and the films were found to exhibit two activation energies. Analysis of the activation energy in the low-temperature region led to the conclusion that the electrical conduction might be due to charge carriers in fully ionized trap states of the partially depleted grains, while the conduction in the high-temperature region might be due to thermionic emission of charge carriers from grains.