Helium ion beam lithography on fullerene molecular resists for sub-10 nm patterning

Research output: Contribution to journalArticle

Authors

  • Xiaoqing Shi
  • Ejaz Huq
  • Darren M. Bagnall
  • Stuart A. Boden

Colleges, School and Institutes

Abstract

Helium ion beam lithography (HIBL) is an emerging technique that uses a sub-nanometre focused beam of helium ions generated in the helium ion microscope to expose resist. It benefits from high resolution, high sensitivity and a low proximity effect. Here we present an investigation into HIBL on a novel, negative tone fullerene-derivative molecular resist. Analysis of large area exposures reveals a sensitivity of ~ 40 μC/cm2 with a 30 keV helium beam which is almost three orders of magnitude higher than the sensitivity of this resist to a 30 keV electron beam. Sparse line features with line widths of 7.3 nm are achieved on the ~ 10 nm thick resist. The fabrication of 8.5 half-pitched lines with good feature separation and 6 nm half-pitched lines with inferior but still resolvable separation are also shown in this study. Thus, sub-10 nm patterning with small proximity effect is demonstrated using HIBL using standard processing conditions, establishing its potential as an alternative to EBL for rapid prototyping of beyond CMOS devices.

Details

Original languageEnglish
JournalMicroelectronic Engineering
Early online date26 Feb 2016
Publication statusE-pub ahead of print - 26 Feb 2016

Keywords

  • Helium ion beam lithography, Helium ion Microscope, Fullerene, Molecular resist, Nanolithography, Next-generation lithography