SIMULATION OF ION TRAJECTORIES NEAR SUBMICRON-PATTERNED SURFACE INCLUDING EFFECTS OF LOCAL CHARGING AND ION DRIFT VELOCITY TOWARD A WAFER

Ion trajectories near a submicron-patterned surface were investigated using numerical simulations including effects of local charging on the patterned surface and ion drift velocity toward the wafer. The simula tion results were also discussed relative to the etched profile charac teristics in electron cyclotron resonance (ECR) plasmas with a diverge nt magnetic held. Since the pattern size was much smaller than the Deb ye length, charge neutrality was not satisfied on the submicron-patter ned surface. The simulated ion trajectories were largely deflected at the inside of the outermost lines of line-and-space patterns. Moreover , the ion trajectory deflection was reduced with increasing ion drift velocity. These simulation results showed a similar tendency as the et ching characteristics.