All-Water Etching-Free Electron Beam Lithography for On-Chip Nanomaterials

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Conventional electron beam lithography requires complex post-processing steps like dry etching or lift-off.
• Direct patterning of diverse semiconductor materials on substrates remains a challenge.

Purpose of the Study:

• To develop an etching-free electron beam lithography (EBL) technique for direct nanopatterning.
• To achieve fabrication of various semiconductor materials in an all-water process.

Main Methods:

• Utilized electron beams to copolymerize introduced sugars with metal ions-coordinated polyethylenimine.
• Employed an all-water process followed by thermal treatment for nanomaterial formation.
• Demonstrated direct printing of semiconductor nanopatterns on silicon wafers.

Main Results:

• Achieved direct writing of semiconductor nanopatterns, including zinc oxide (ZnO), with line widths as small as 18 nm.
• Obtained ZnO patterns with a carrier mobility of 3.94 cm² V⁻¹ s⁻¹.
• Demonstrated the capability to produce diverse on-chip semiconductors like metal oxides, sulfides, and nitrides.

Conclusions:

• The developed etching-free EBL strategy offers an efficient alternative for micro/nanofabrication.
• This aqueous solution-based system enables direct on-chip printing of various semiconductor materials.
• The method simplifies the fabrication process, reducing complexity and potentially cost for chip manufacturing.