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TiSixOy as an absorptive shifter (embedded layer) for attenuated phase-shifting mask (APSM) in 248 nm wavelength is presented. TiSixOy thin film was formed by plasma sputtering of Ti (25∼55 W) and Si (200∼250 W) under Ar (30 seem) and oxygen (0.1∼0.4 seem). For required phase shift degree θ =180°, calculated thickness d180 of TiSixOy film is within the range of 87-120 nm depending on its reflectivity R, transmittance T, refractive index n and extinction coefficient k. Taguchi design of experiment has been applied to study the plasma etching selectivity of TiSixOy over APSM's substrate quartz (SiO2), under C12:NF3=20:30 seem; 50 W and 60 mtorr, selectivity of 10:1∼35:1 was observed. Modifications of reflectivity-transmittance (R-T) method have been developed for the determination of this absorptive shifter's n and k.

Original publication




Journal article


Microelectronic Engineering

Publication Date





125 - 128