Experimental Studies on the Dynamic Memcapacitance Modulation of the ReO₃@ReS₂ Composite Material-Based Diode

In this study, both memcapacitive and memristive characteristics in the composite material based on the rhenium disulfide (ReS₂) rich in rhenium (VI) oxide (ReO₃) surface overlayer (ReO₃@ReS₂) and in the indium tin oxide (ITO)/ReO₃@ReS₂/aluminum (Al) device configuration is presented. Comprehensive experimental analysis of the ReO₃@ReS₂ material properties' dependence on the memcapacitor electrical characteristics was carried out by standard as well as frequency-dependent current-voltage, capacitance-voltage, and conductance-voltage studies. Furthermore, determination of the charge carrier conduction model, charge carrier mobility, density of the trap states, density of the available charge carrier, free-carrier concentration, effective density of states in the conduction band, activation energy of the carrier transport, as well as ion hopping was successfully conducted for the ReO₃@ReS₂ based on the experimental data. The ITO/ReO₃@ReS₂/Al charge carrier conduction was found to rely on the mixed electronic-ionic processes, involving electrochemical metallization and lattice oxygen atoms migration in response to the externally modulated electric field strength. The chemical potential generated by the electronic-ionic ITO/ReO₃@ReS₂/Al resistive memory cell non-equlibrium processes leads to the occurrence of the nanobattery effect. This finding supports the possibility of a nonvolatile memory cell with a new operation principle based on the potential read function.