Self-Assembled Nanofeatures in Complex Three-Dimensional Topographies via Nanoimprint and Block Copolymer Lithography...

Area of Science:

• Materials Science
• Nanotechnology
• Lithography

Background:

• Achieving ultrasmall dimensions and high throughput is crucial for nanotechnology.
• Existing nanolithography techniques face challenges in precise feature fabrication.

Purpose of the Study:

• To demonstrate an integrated approach for fabricating isolated sub-20 nm silicon oxide features.
• To explore the generation of isolated silica structures on substrates using combined methods.

Main Methods:

• Utilized nanoimprint lithography (NIL) to create polyhedral oligomeric silsesquioxane (POSS) topographical arrays.
• Employed block copolymer (BCP) lithography with polystyrene-block-poly(dimethylsiloxane) (PS-b-PDMS) for nanofeature confinement.
• Applied a one-step etching process to create line-space arrays with a 35 nm period.

Main Results:

• Successfully generated isolated sub-20 nm silicon oxide features.
• Achieved large-area (>6 μm) coverage of line-space arrays within confined POSS arrays.
• Demonstrated aligned features for directed self-assembly applications.

Conclusions:

• The integration of NIL and BCP lithography offers a powerful strategy for high-density, confined nanoscale feature fabrication.
• This method enables the creation of discrete features in the deep nanoscale regime over macroscopic areas.
• The developed techniques hold potential for applications in microelectronics, sensors, nanofluidics, and optical devices.