Volatile Organic Compounds Sensing using Monolayer MoS2 Based FET

Transition metal dichalcogenides (TMDs) are attaining a lot of attention these days in sensing applications due to their unique properties like bandgap, high surface-to-volume ratio, and low power consumption. In this paper, a MoS 2 based field-effect transistor (FET) gas sensor is designed and simulated in COMSOL Multiphysics for different volatile organic compounds (VOCs). MoS 2 of thickness 0.7 nm is used as channel material to sense the target VOCs. When the MoS 2 monolayer is exposed to target VOCs the adsorption of gas vapors increases the drain current due to this, the electrical conductivity of the device changes. The input-output and transfer characteristics of MoS 2 FET are simulated in the presence of target gases. In addition, the sensitivity, selectivity, and stability of the VOC sensor for different target VOCs are presented. The proposed sensor provides high sensitivity and selectivity toward ethanol vapors.