Ac Conductivity of Amorphous As2Se3

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Abstract
Electrical conduction in amorphous As2Se3 is investigated at frequencies from 30 Hz to 10.3 GHz in the temperature range -180° to 500°C. The observed conductivity σ can be expressed as a sum of dc conductivity σdc and ac conductivity σac, namely σ=σdc+σac. The quantity σdc depends exponentially on reciprocal temperature. The contribution of σac to σ is negligible at high temperature. At low temperature, σac is nearly independent of temperature but strongly depends on the frequency. The frequency dependence of σac is linear and quadratic in the frequency range up to 106 Hz and between 106 and 108 Hz, respectively, and above 108 Hz, σac has no frequency dependence. The experimental results of the conductivity of amorphous As2Se3 cannot be interpreted by the hopping conduction only, and the effects of spatial inhomogeneity may be responsible for the conduction mechanisms in amorphous As2Se3.