Grooved-gate silicon-on-nothing (SON) MOSFET: evidence for suppressing SCEs

Abstract

This paper presents a simulation-based systematic characterization of a dual-metal-stack grooved-step-gate (DMS-GSG) silicon-on-nothing (SON) metal–oxide–semiconductor field-effect transistor (MOSFET) with stack buried oxide (SBO) for restraining short-channel effects (SCEs). Comparison was done between silicon-on-insulator (SOI) and SON SBO grooved-gate (GG) MOSFETs to realize the feasibility of the presented structure. Analysis of thermal stability over a wide range of temperatures was carried out for better characterization of the proposed structure. Further, the impact of structural parameters such as the negative junction depth and the influence of the work-function difference on the threshold voltage, drain current and drain-induced barrier lowering were analyzed. The investigation revealed that the DMS-GSG SON MOSFET is more prominent than other GG SOI MOSFETs in terms of switching behavior, SCEs, hot-carrier effect, intrinsic gain and early voltage. Further, the presence of air in the SBO of the DMS-GSG SON MOSFET suppresses the self-heating effect. Thus, this in-depth investigation is relatively beneficial to find out the performance improvement of SON structures over SOI ones for nanoscale short-channel devices.