DNA Origami Mask for Sub-Ten-Nanometer Lithography.

Area of Science:

• Nanotechnology and Materials Science
• Semiconductor Manufacturing and Lithography

Background:

• DNA nanotechnology offers precise control over nanoscale feature fabrication.
• Advanced lithography techniques are crucial for developing next-generation electronic devices.

Purpose of the Study:

• To demonstrate pattern transfer from DNA origami to silicon dioxide (SiO2) using anhydrous hydrogen fluoride (HF) vapor.
• To achieve sub-10-nm resolution in lithography by leveraging DNA's self-assembly capabilities.

Main Methods:

• Utilized DNA origami structures as templates for nanoscale pattern definition.
• Employed anhydrous HF vapor in a semiconductor etching machine for pattern transfer.
• Investigated the etching process, including time, rate, and surface coverage by magnesium.

Main Results:

• Successfully transferred a 9 × 14 nm² hole pattern from DNA origami into an SiO2 layer with sub-10-nm resolution.
• Observed pattern shape inheritance from the DNA structure within 30–60 seconds of etching at an etching rate of 0.2 nm/s.
• Identified pattern corrosion and reaction blocking at 600 seconds of etching, defining process limits.

Conclusions:

• DNA-based lithography is a viable method for high-resolution pattern transfer into SiO2.
• The study establishes a process window, fabrication rules, and limitations for DNA-based lithography.
• Results pave the way for utilizing DNA nanotechnology in advanced semiconductor manufacturing.