Gate-first n-MOSFET with a sub-0.6-nm EOT gate stack

Abstract

We report a self-aligned and gate-first TiLaO/La2O3 n-MOSFET with an equivalent oxide thickness (EOT) of 0.57 nm and low threshold voltage (V-t) of 0.3 V. The small EOT MOSFET can be reached using La-based interfacial layer with strong bond enthalpy (La-O, 799 kJ/mol) to suppress the formation of defect-rich low- interfacial layer and simultaneously block titanium atom inter-diffusion to avoid additional EOT increase. This gate-first low-EOT MOSFET exhibits the potential to integrate with current CMOS process. (C) 2013 Elsevier B.V. All rights reserved.