Simulation and Equivalent Circuit Modeling of Two-Dimensional Thin Films: Exploring MoS2-Graphene Heterostructure for Wi-Fi Band Application

This work introduces a simulation-driven framework for reliably reproducing experimental trends pertaining to two-dimensional thin films, thus rendering advanced heterostructure research feasible for facilities without sophisticated equipments. Zhang and his colleagues fabricated a molybdenum disulfide (MoS<sub>2</sub>) device in a ground-signal-ground (G-S-G) configuration and derived its equivalent electrical circuit. This research simulates a MoS<sub>2</sub>-graphene based coplanar transmission line (CPTL) in a G-S-G configuration using Ansys HFSS. Thereafter an accurate equivalent electrical model circuit was designed and calculated for its hetero-junction device using Advance Design System simulator. For validation the characteristic curves of the simulated and modeled devices are compared with the measurements obtained for the metallic MoS<sub>2</sub> proposed by Zhang and his colleagues, which are used in this study for validation purposes rather than as a foundation for the proposed model. The validation results confirms that the proposed simulation method can consistently replicate experimental trends. Furthermore, the effect of the combined properties of MoS<sub>2</sub> and graphene on performance is evaluated based on S-parameters, and its high-frequency behavior is assessed through scattering parameter analysis (S<sub>11</sub>, S<sub>21</sub>), particularly at 5.9 GHz. Among the four different configurations assessed in this study, the one with the graphene monolayer positioned on the source side of the MoS<sub>2</sub> signal line exhibited improved high-frequency performance in terms of I–V and C–V characteristics, as well as a low parasitic effect. Therefore, it can potentially be utilized in future devices and next-generation Wi-Fi spectra.