Hot-carrier currents of SOI MOSFETs

MOSFETs built on the SOI structure exhibit superior short channel behaviors over the bulk MOSFETs. They also have other advantages such as reduction of the junction capacitance, radiation hardness and ease for device isolation. The SOI MOSFET is a promising candidate for future device scaling. The hot-carrier effect that increases with device miniaturization is another important device scaling constraint that has to be considered for the SOI MOSFET. The hot-carrier effect, which is usually monitored by the substrate current for the NMOSFET and the gate current for the PMOSFET for bulk devices, are closely related to the high channel electric field near the drain. The quasi-two-dimensional (quasi-2D) model provides the link between the hot-carrier currents and the device design parameters for the bulk MOSFETs. This model is refined by considering the 2D effect and the lateral doping gradient effect separately