Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 20, Pages 23944-23950Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c02123
Keywords
microcontact printing; grayscale lithography; fluorocarbon; plasma treatment; structural colors
Funding
- Villum Fonden [00027987]
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Plasma-assisted microcontact printing (PA-mu CP) is a novel lithography method that utilizes plasma-deposited fluorocarbon as ink material to transfer patterns from a stamp to substrates via thermal evaporation. The geometry of the patterns can be modified by adjusting stamp designs and contact time, and the transferred fluorocarbon patterns can be used as etch masks for creating microstructures in substrate materials.
Microcontact printing, polymer pen lithography, and their variations have attracted interests from a broad spectrum of research fields as a result of the feasibility of defining patterns in micro- and nanoscales. In this work, we have proposed and demonstrated a novel lithography method, named plasma-assisted microcontact printing (PA-mu CP). Unlike the previous printing methods, where a direct contact is normally required for the transport of liquid-phase inks, plasma-deposited fluorocarbon (FC) has been employed in PA-mu CP as the ink material, which can be transferred from the stamp to substrates through a thermal evaporation process. The geometry of the patterns can be modified by adjusting the design of stamp patterns and the contact time, and transferred FC patterns can be used directly as an etch mask to create microstructures in the substrate materials. We have demonstrated the possibility of performing multi-patterning with PA-mu CP, where FC patterns can be generated conformally on structured substrates. Because the height of FC patterns is closely related to the local pattern designs, PA-mu CP can be used for grayscale patterning. As a proof of concept, Fabry-Perot planar cavities are fabricated with grayscale PA-mu CP for structure color printing. We believe PA-mu CP is distinguished from conventional techniques by its printing mechanism, which can pave the way for convenient fabrication of photonic, electronic, and biological devices.
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