Damage-free neutral beam etching technology for high mobility FinFETs

Our newly developed neutral beam (NB) etching accomplished the damage-free (defect-free and smooth surface) fabrication of high aspect rectangular Si-fins for the first time. The fabricated FinFETs realized higher device performance (higher electron mobility) than that using a conventional reactive ion etching. The improved mobility is well explained by the NB etched atomically-flat surface. Our new results strongly support the effectiveness of the NB technology for the nano-scale CMOS fabrication