The physical effects in SOI MOSFETs such as the floating substrate regime in `thick' film, accumulation of excess holes in `thick' and `thin' film for the negative voltage at the back gate, the influence of the fixed surface charges at the front and back interface Si-SiO2 are investigated using two-dimensional numerical simulation. The dependence of the current- voltage characteristics of SOI MOSFET on the physical and technological parameters are analyzed. Some specific effects such as kink-effect, histeresis of drain characteristics, drain current overshoot, and their dependences on the switching speed are investigated. It is shown that thin film SOI devices with excluding floating substrate effects must be used for high speed VLSI. The switching characteristics of the different construction of the SOI/CMOS structures are simulated and compared. It is shown that thin film 3-D SOI/CMOS make a good choice for high speed VLSI.
|