Abstract
ABSTRACTThe authors present the technological routes used to build planar and vertical gate all-around (GAA) field-effect transistors (FETs) using both Si and SiGe nanowires (NWs) and the electrical performances of the as-obtained components. Planar FETs are characterized in back gate configuration and exhibit good behavior such as an ION/IOFF ratio up to 106. Hysteretic behavior and sub-threshold slope values with respect to surface and oxide interface trap densities are discussed. Vertical devices using Si NWs show good characteristics at the state of the art with ION/IOFF ratio close to 106 and sub-threshold slope around 125 mV/decade while vertical SiGe devices also obtained with the same technological processes, present an ION/IOFF ratio from 103 to 104but with poor dynamics which can be explained by the high interface traps density.
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