1. Analysis of etching mechanism and etched slope control of silicon for nanoimprinting lithography
- Author
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Baek Kh, Park Kb, Young Keun Kim, Kwang-Ho Kwon, Yong-Hyun Ham, and Lee-Mi Do
- Subjects
Materials science ,Silicon ,business.industry ,Biomedical Engineering ,Mixing (process engineering) ,chemistry.chemical_element ,Bioengineering ,General Chemistry ,Plasma ,Condensed Matter Physics ,Nanoimprint lithography ,law.invention ,Volumetric flow rate ,chemistry ,Etching (microfabrication) ,law ,Optoelectronics ,General Materials Science ,business ,Critical dimension ,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.
- Published
- 2011