Resistive switching characteristics of (V2O5)0.7−x(GeO2)0.3(CuO)x glasses

The effect of replacing vanadium by Cu2+ ion on the dc-electrical conductivity (σ) and I–V characteristics of (V2O5)0.7(GeO2)0.3 glass has been investigated at different temperatures. The conductivity value increases with increasing the concentration of Cu2+. The electrical conduction is interpreted on the basis of electrons hopping from reduced to unreduced vanadium and/or cupper ions. The I–V characteristic curves showed three regions of conduction, namely, high resistance state (OFF-state), turnover point with zero differential resistance region (∂V/∂I = 0) and a differential negative-resistance region. The turnover point is strongly dependent on composition, sample thickness and temperature. The switching data are discussed according to electrothermal model.