My research is focused on semiconductor device physics modeling and analysis. My early research focused on contact phenomena in two-dimensional (2D) systems. This was followed by intensive research on the modeling of field-effect transistor (FET) devices, including MOSFETs and FinFETs, nanowire (NW) FETs, and junctionless NW FETs. Particular emphasis has been placed on the development of models for NW ISFETs and NW biosensors, including their dynamic behavior. Nanowire photodiodes and solar cells are another important aspect of my modeling interests. I am currently working on compact modeling of GaN MIS-HEMTs.