Aligned nanowires and nanodots by directed block copolymer assembly

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Science

Background:

• Block copolymers (BCPs) self-assemble into ordered nanostructures.
• Directed self-assembly (DSA) offers precise control over nanostructure formation.
• Sub-10 nm feature generation is crucial for advanced electronics and photonics.

Purpose of the Study:

• To investigate the directed self-assembly of block copolymers (BCPs) using surface patterning.
• To explore the manipulation of BCP microdomain ordering and orientation.
• To understand the effects of lattice commensurability and mismatch on BCP nanostructures.

Main Methods:

• Utilizing surface patterning to guide the lateral ordering of BCP microdomains.
• Comparing commensurate and incommensurate lattice arrangements between surface patterns and BCP natural periods.
• Analyzing the influence of lattice mismatch and pattern amplification on BCP feature size, shape, and pitch.

Main Results:

• Achieved ultradense arrays of spherical or cylindrical BCP microdomains.
• Demonstrated control over BCP microdomain arrangement into 1D nanowires or 2D nanodots via commensurability.
• Showcased the impact of lattice mismatch, including skew angles, on BCP chain stretching/compression and resulting nanostructures.

Conclusions:

• Surface patterning is an effective strategy for directed self-assembly of BCPs into ordered nanostructures.
• Commensurability and lattice mismatch offer tunable control over BCP nanostructure dimensions and arrangement.
• This approach provides a transparent method to study and engineer sub-10 nm features without substrate modification.