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Single-Digit Nanometer Electron-Beam Lithography with an Aberration-Corrected Scanning Transmission Electron Microscope
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Polystyrene negative resist for high-resolution electron beam lithography.

Siqi Ma1, Celal Con, Mustafa Yavuz

  • 1Waterloo Institute for Nanotechnology (WIN), University of Waterloo, 200 University Ave, West, Waterloo, ON N2L 3G1, Canada. bcui@uwaterloo.ca.

Nanoscale Research Letters
|July 14, 2011
PubMed
Summary
This summary is machine-generated.

Low molecular weight polystyrene achieves ultra-high resolution in electron beam lithography (EBL), creating the densest patterns with organic resists. This cost-effective material offers excellent process control and dry-etch resistance for specialized negative resist applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Lithography

Background:

  • Electron beam lithography (EBL) is crucial for fabricating nanoscale structures.
  • Developing high-resolution, cost-effective resists is essential for advancing nanofabrication.
  • Polystyrene (PS) is a widely available polymer with potential resist applications.

Purpose of the Study:

  • To investigate the exposure behavior of low molecular weight polystyrene (PS).
  • To determine the ultimate resolution achievable with PS as a negative tone EBL resist.
  • To evaluate PS for its potential in high-resolution nanofabrication.

Main Methods:

  • Studied the exposure characteristics of low molecular weight polystyrene.
  • Utilized electron beam lithography (EBL) at varying beam energies (20 and 5 keV).
  • Employed different developers to optimize pattern formation and resolution.

Main Results:

  • Achieved well-defined patterning of a 20-nm period line array and a 15-nm period dot array.
  • Demonstrated the densest patterns reported for organic EBL resists.
  • Confirmed pattern formation at both 20 and 5 keV beam energies.

Conclusions:

  • Low molecular weight polystyrene exhibits ultra-high resolution capability in EBL.
  • PS offers a simple, low-cost, and stable alternative to conventional resists.
  • Its properties make it suitable for applications requiring negative tone resists where throughput is not critical.