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Fabrication and Characterization of Gate-All-Around Silicon Nanowires on Bulk Silicon

Year: 2008
Type: article
Abstract: This paper reports on the top-down fabrication and electrical performance of silicon nanowire (SiNW) gate-all-around (GAA) n-type and p-type MOSFET devices integrated on bulk silicon using a local-silicon-on-insulator (SOI) process. The proposed local-SOI fabrication provides various nanowire cross sections: Omega-like, pentagonal, triangular, and circular, all controlled by isotropic etching using nitride spacers and silicon sacrificial oxidation. The reported top-down SiNW fabrication offers excellent control of wire doping and placement, as well as ohmic source and drain contacts. A particular feature of the process is the buildup of a tensile strain in all suspended nanowires, attaining values of few percents, reflected in stress values higher than 2-3 GPa. A very high yield (>90%) is obtained in terms of functionality of long-channel SiNW GAA mosfet. Device characteristics are reported from cryogenic temperature (T= 5 K) up to 150degC, and promising characteristics in terms of low-field electron mobility, threshold voltage control, and subthreshold slope are demonstrated. Low field mobility for electrons up to 850 cm2/Vmiddots is reported at room temperature in suspended devices with triangular cross sections; this mobility enhancement is explained by the process-induced tensile strain. In short, suspended SiNW GAA with small triangular cross sections, a single-electron transistor (SET) operation regime is highlighted atT= 5 K. This is attributed to a combined effect of strain and corner conduction in triangular channel cross sections, suggesting the possibility to hybridize CMOS and SET functions by a unique nanowire fabrication platform.
DOI: 10.1109/tnano.2008.2007215
Language: English
Open Access status: green
OpenAlex ID: W2039066560
FWCI: 5.54
Cites: 30
Cited by: 91
Related to: 10