DNA Origami for Silicon Patterning

Desoxyribonucleic acid (DNA) origami architectures are a promising tool for ultimate lithography because of their ability to generate nanostructures with a minimum feature size down to 2 nm. In this paper, we developed a method for silicon (Si) nanopatterning to face up current limitations for high-...

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Veröffentlicht in:ACS applied materials & interfaces 2020-08, Vol.12 (32), p.36799-36809
Hauptverfasser: Thomas, Guillaume, Diagne, Cheikh Tidiane, Baillin, Xavier, Chevolleau, Thierry, Charvolin, Thomas, Tiron, Raluca
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Sprache:eng
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Zusammenfassung:Desoxyribonucleic acid (DNA) origami architectures are a promising tool for ultimate lithography because of their ability to generate nanostructures with a minimum feature size down to 2 nm. In this paper, we developed a method for silicon (Si) nanopatterning to face up current limitations for high-resolution patterning with standard microelectronic processes. For the first time, a 2 nm-thick 2D DNA origami mask, with specific design composed of three different square holes (with a size of 10 and 20 nm), is used for positive pattern transfer into a Si substrate using a 15 nm-thick silicon dioxide (SiO2) layer as an intermediate hard mask. First, the origami mask is transferred onto the SiO2 underlayer, by an HF vapor-etching process. Then, the Si underlayer is etched using an HBr/O2 plasma. Each hole is transferred in the SiO2 layer and the 20 nm-sized holes are transferred into the final stack (Si). The resulting patterns exhibited a lateral resolution in the range of 20 nm and a depth of 40 nm. Patterns are fully characterized by atomic force microscopy, scanning electron microscopy, focused ion beam–transmission electron microscopy, and ellipsometry measurements.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.0c10211