Polyatomic ions from a high current ion implanter driven by a liquid metal ion source.

Area of Science:

• Materials Science
• Surface Engineering
• Ion Beam Technology

Background:

• High current liquid metal ion sources (LMAISs) are established in space propulsion.
• LMAISs are unique in providing polyatomic ions from numerous elements.
• Focused ion beams with LMAISs are limited to small treatment areas.

Purpose of the Study:

• Adapt LMAIS technology for broad ion beam applications.
• Enable large-area surface patterning using polyatomic ions.
• Investigate nano-structure formation on semiconductor materials.

Main Methods:

• Transferred space propulsion LMAIS technology to a large ion implanter.
• Developed a high-current ion beam injector with specialized ion optics.
• Characterized needle, porous emitter, and capillary LMAIS types.

Main Results:

• Achieved ion currents in the microampere range.
• Generated a nearly parallel ion beam with millimeter diameter.
• Demonstrated large-area surface modification of Germanium (Ge) using polyatomic Bismuth (Bi₂⁺) ions.

Conclusions:

• The adapted LMAIS technology successfully enables broad ion beam processing.
• Polyatomic ion irradiation from LMAISs is effective for large-area surface nano-structuring.
• This technique offers a promising route for advanced semiconductor surface modification.