Optimization of fluorine plasma treatment for interface improvement on HfO2/In0.53Ga0.47As MOSFETs

Abstract

This paper reports significant improvements in the electrical performance of In0.53Ga0.47As metal-oxide-semiconductor field-effect transistors (MOSFET) by a post-gate CF4/O2 plasma treatment. The optimum condition of CF4/O2 plasma treatment has been systematically studied and found to be 30 W for 3-5 min. Approximately 5× reduction in interface trap density from 2.8 × 1012 to 4.9 × 1011 cm-2eV-1 has been demonstrated with fluorine (F) incorporation. Subthreshold swing has been improved from 127 to 109 mV/dec. Effective channel mobility has been enhanced from 826 to 1,144 cm2/Vs.