Lithography for robust and editable atomic-scale silicon devices and memories

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Atomic-scale fabrication traditionally faces a trade-off between structural complexity and thermal stability.
• Complex structures often lack stability at higher temperatures, limiting device applications.
• Highly stable systems typically restrict fabrication complexity.

Purpose of the Study:

• To enhance automated hydrogen lithography (HL) techniques using scanning tunneling microscopy (STM).
• To develop efficient error correction methods for atomic-scale fabrication.
• To enable the creation of large, thermally stable, and error-free atomic-scale structures on silicon.

Main Methods:

• Utilized advanced scanning tunneling microscope (STM) techniques to improve automated hydrogen lithography (HL).
• Developed hydrogen repassivation as an efficient error correction and editing tool.
• Demonstrated fabrication of atomic-scale structures with high thermal stability.

Main Results:

• Achieved error-free, room-temperature stable atomic-scale structures of unprecedented size.
• Created two rewriteable atomic memories with a density of 1.1 petabits per in².
• Successfully stored the alphabet and a piece of music using atomic-scale memory.

Conclusions:

• Overcame the fabrication-stability trade-off in atomic-scale engineering.
• Advanced hydrogen lithography (HL) enables practical, silicon-based atomic-scale devices.
• The developed techniques are adaptable to various STMs, accelerating device development.