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Tunable daughter molds from a single Si master grating mold

Authors :
Ramakrishnan Ganesan
Ghim Wei Ho
Charanjit S. Bhatia
Hyunsoo Yang
Shreya Kundu
Hazrat Hussain
Mohammad S. M. Saifullah
Su Hui Lim
Source :
Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena. 32:051601
Publication Year :
2014
Publisher :
American Vacuum Society, 2014.

Abstract

After the cost of ownership of tool, the next significant cost involved in nanoimprint lithography is that of mold fabrication. The cost of mold fabrication is proportional to the area of pattern and follows an inverse relationship with the pattern resolution. In this work, the authors demonstrate proof-of-concept fabrication of Si and SiO2 grating molds of variable feature sizes, spacings, densities, and aspect ratios that can be generated from a single Si master mold of 2 μm line and space features. This process utilizes “SiO2 resin,” which can be imprinted via in situ thermal free radical polymerization. Heat-treatment of the patterned resin resulted in loss of organics, formation of SiOx and gave rise to known feature size reduction (∼65%). After the pattern transfer using SiOx as the etch mask, a Si daughter mold containing 0.7 μm wide gratings with 3.3 μm spacing was generated. The process of imprinting and heat-treatment was repeated using the daughter mold, which regenerated a mold that approximates the master mold feature profile. Our technique demonstrates that submicron-sized features can be achieved from Si molds containing micron-sized features and vice versa. Such flexibility may lead to substantial reduction in the cost of mold fabrication.

Details

ISSN :
21662754 and 21662746
Volume :
32
Database :
OpenAIRE
Journal :
Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena
Accession number :
edsair.doi...........1c5238fae661368ed28c88bbad7f0b49