Add time:08/01/2019         Source:sciencedirect.com

Electrical conductivity, σ(T), of a-Ge3Nx (3.7 < x < 4.6) and quasi-stoichiometric a-Ge2OyNx films has been investigated as a function of the temperature. Layers present a highly insulating behavior with conductivity and thermal activation energy rapidly rising, increasing T from room temperature to 600 K. Depending on the film composition, the conductivity can vary up to six orders of magnitude.Data analysis of σ(T) revealed a clear relation between the pre-exponential factor and the thermal activation energy, suggesting the validity of the Meyer-Neldel rule. For all investigated films, typical Meyer-Neldel parameters assume values in a narrow range: 10 −8 < σ00 < 10 −6(Ωcm) −1 and 41 < EMN < 51 meV.To account for this behavior we have considered a model based on a statistical shift of the Fermi level upon the temperature raise. Our study is the first experimental evidence of this kind of electrical behavior in this class of materials.

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