Three-dimensional nanolithography guided by DNA modular epitaxy.

Area of Science:

• Nanotechnology
• Materials Science
• Biotechnology

Background:

• Scalable nanomanufacturing relies on lithographic scaling of 3D patterns.
• Current methods like extreme-ultraviolet lithography achieve ~30 nm pitch.
• Further scaling requires complex post-fabrication processes.

Purpose of the Study:

• To develop a novel method for achieving sub-20 nm pitch in 3D nanostructures.
• To demonstrate the use of DNA nanostructures for high-resolution patterning.
• To overcome limitations of current lithographic techniques.

Main Methods:

• Fabrication of 3D DNA nanostructures using a DNA modular epitaxy approach.
• Design of DNA masks with controlled geometry, pitch, and critical dimensions.
• Pattern transfer to a silicon substrate via single-run reactive ion etching.

Main Results:

• Achieved a line pitch of 16.2 nm, approximately 50% smaller than state-of-the-art.
• Transferred DNA patterns to a silicon substrate with a lateral critical dimension of 7 nm and vertical critical dimension of 2 nm.
• Demonstrated nanolithography with pitches smaller than projected for advanced field-effect transistor technology nodes.

Conclusions:

• 3D DNA nanostructures enable significant scaling of pitch in nanomanufacturing.
• DNA modular epitaxy provides a versatile platform for designing 3D nanostructures.
• This approach offers a potential complement to existing lithographic tools for advanced 3D nanomanufacturing.