A Compact Current–Voltage Model for 2D Semiconductor Based Field-Effect Transistors Considering Interface Traps, Mobility Degradation, and Inefficient Doping Effect

Abstract

This paper presents an analytical current-voltage model specifically formulated for 2-dimensional (2D) transition metal dichalcogenide (TMD) semiconductor based field-effect transistors (FETs). The model is derived from the fundamentals considering the physics of 2D TMD crystals, and covers all regions of the FET operation (linear, saturation, and subthreshold) under a continuous function. Moreover, three issues of great importance in the emerging 2D FET arena: interface traps, mobility degradation, and inefficient doping have been carefully considered. The compact models are verified against 2-D device simulations as well as experimental results for state-of-the-art top-gated monolayer TMD FETs, and can be easily employed for efficient exploration of circuits based on 2D FETs as well as for evaluation and optimization of 2D TMD-channel FET design and performance.