Patterning at 6.5 nm wavelength using interference lithography

We present the results of patterning chemically-amplified and inorganic resists at 6.5 nm wavelength using interference lithography. Well-resolved patterns down to 22 nm HP are obtained. Dose-dependent line-edge roughness and critical dimensions in the resolution range of 50-22 nm half-pitch are obtained using 13.5 and 6.5 nm wavelength. The performances of the resists are compared for both cases. Increased line-edge roughness is observed for patterning 6.5 nm compared to the patterning at 13.5 nm wavelength.