title: Analysis of etching mechanism and etched slope control of silicon for nanoimprinting lithography.
abstract: In the nanoimprint lithography (NIL) process, profile control of imprint masters is a very important task. Therefore, we attempted to control the etched slope of imprint masters as a function of adding O2 to CF4 plasma. Etched profile mechanisms and relationships between the etch kinetics and plasma chemistry were explored using zero-dimensional-based modeling. O2 flow rate increased to 24 sccm, the Si etch rate increased in the range of 186-393 nm/min, while the etch rate rapidly decreased as the O2 flow rate increases beyond 24 sccm. Meanwhile, change in the etch rate of SiO2 followed a similar tendency as the etch rate of Si as a function of O2 flow rate in the CF4/O2 mixing gases. The Si and SiO2 etch rate were expected to be closely dependent on the F radical intensity in CF4/O2 mixing gases. Moreover, the results of simulated normalized lateral etch critical dimension (NLECD) are in agreement with the measured NLECD as a function of O2 flow rate in the CF4/O2 mixing gases.
authors: Department of Control and Instrumentation Engineering, Korea University, Jochiwon, Chungnam 339-700, Korea.
authors: Y-H
authors: YH
authors: Ham
authors: Y
authors: Y
authors: Kim
authors: K-H
authors: KH
authors: Baek
authors: L M
authors: LM
authors: Do
authors: K-H
authors: KH
authors: Kwon
authors: K-B
authors: KB
authors: Park