GeSn Vertical Gate-all-around Nanowire n-type MOSFETs

Abstract

Vertical GeSn gate-all-around (GAA) nanowire nMOSFETs fabricated using a top-down approach are presented. The devices are benchmarked with similar Ge and Ge/GeSn/Ge heterostructure devices to underline the great potential of GeSn for future nMOS devices. Device measurements are performed in the temperature range from 12 K to room temperature (RT, 300 K). At RT the all-GeSn n-MOSFETs show a subthreshold swing (SS) of ∼120 mV/dec that decreases at cryogenic temperatures to a very steep 20mV/dec. The abrupt transition from subthreshold to on-state shows the suitability of GeSn alloys for cryogenic CMOS applications.