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Related Experiment Video

Updated: Jan 25, 2026

Advancing High-Resolution Imaging of Virus Assemblies in Liquid and Ice
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Path to Move Beyond the Resolution Limit with Directed Self-Assembly.

Lei Wan1, Ricardo Ruiz1

  • 1Western Digital Company, WDC Research , 5601 Great Oaks Parkway , San Jose , California 95119 , United States.

ACS Applied Materials & Interfaces
|May 11, 2019
PubMed
Summary
This summary is machine-generated.

Directed self-assembly (DSA) overcomes lithography limits by combining graphoepitaxy and chemoepitaxy. This novel self-registered self-assembly (SRSA) approach achieves high-density multiplication and critical dimension shrinkage for advanced patterning.

Keywords:
PS--PMMAblock copolymer lithographychemical markerchemoepitaxydensity multiplicationgraphoepitaxyself-registered self-assembly

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Lithography

Background:

  • Directed self-assembly (DSA) of block copolymers (BCPs) is a promising technique for extending optical lithography resolution.
  • Current DSA methods (chemoepitaxy, graphoepitaxy) face scalability challenges below 10 nm due to critical dimension (CD) matching requirements.

Purpose of the Study:

  • To develop a synergistic DSA approach integrating graphoepitaxy and chemoepitaxy.
  • To enable simultaneous feature density multiplication and critical dimension shrinkage for advanced patterning.

Main Methods:

  • Proposed a self-registered self-assembly (SRSA) strategy combining topographic and chemical guiding.
  • Utilized a prepattern of neutral mat and neutral brush to guide an ultrathin BCP blend film.
  • Employed SRSA to generate self-registered chemical contrast patterns for subsequent DSA.

Main Results:

  • Achieved nearly perfect DSA on prepatterns with high-density multiplication factors.
  • Demonstrated critical dimensions several multiples of the BCP microdomain size.
  • Enabled full-area, defect-free DSA of thick BCP films through a two-step chemoepitaxial process.

Conclusions:

  • The synergistic SRSA approach effectively overcomes the scalability limitations of traditional DSA methods.
  • This integrated strategy allows for significant resolution gains and density multiplication in nanopatterning.
  • Paves the way for advanced, high-resolution patterning applications in microelectronics.