Multilayer lift-off process for sub-15-nm patterning by step-and-repeat ultraviolet nanoimprint lithography

Numerous studies report the importance of nanoscale metallic features to increase the sensitivity of gas sensors, biodetectors, and for the fabrication of the new-generation plasmonic devices. So far, nanoimprint lithography has not shown the capability to pattern a metallic structure that would both be sub-15 nm and sufficiently thick to ensure electrical conductance. To overcome these limitations, we report a step and repeat nanoimprint lithography (SR-NIL) on a pre-spin-coated layer stack. This work reports the fabrication of sub-15-nm lines that are 15-nm thick and have a 50-nm-half-pitch grating with 35-nm-thick metal, which represents the new state of the art for SR-NIL.

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