Development of controlled nanosphere lithography technology

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Nanosphere lithography (NSL) is a cost-effective technique for fabricating nanostructures.
• Spin-coating is a promising method for creating nanosphere masks, but requires optimization.
• Controlling nanosphere size is crucial for various nanoelectronic and optoelectronic applications.

Purpose of the Study:

• To investigate the influence of spin-coating parameters on nanosphere mask formation.
• To study the controllable size reduction of nanospheres using plasma etching.
• To optimize NSL for high-coverage and reproducible fabrication of nanostructures.

Main Methods:

• Spin-coating of 300 nm nanospheres on a substrate.
• Inductively coupled plasma etching for nanosphere size reduction.
• Analysis of technological parameters affecting coverage and etching rates.

Main Results:

• Optimized spin-coating parameters (speed, time, solution composition) increased substrate coverage to 97.8%.
• Plasma etching parameters (high-frequency power) precisely controlled nanosphere diameter reduction.
• Process reproducibility reached 98.6%, enabling nanoneedle fabrication.

Conclusions:

• Optimized NSL parameters enable efficient and reproducible fabrication of nanosphere masks.
• Plasma etching provides accurate control over nanosphere size reduction for nanoneedle applications.
• The developed NSL process is suitable for nanoelectronics, optoelectronics, and field emission cathodes.