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Abstract
Electron-beam induced deposition of high-purity copper nanostructures is desirable for nanoscale rapid prototyping, interconnection of chemically synthesized structures, and integrated circuit editing. However, metalorganic, gas-phase precursors for copper introduce high levels of carbon contamination. Here we demonstrate electron beam induced deposition of high-purity copper nanostructures from aqueous solutions of copper sulfate. The addition of sulfuric acid eliminates oxygen contamination from the deposit and produces a deposit with ~95 at% copper. The addition of sodium dodecyl sulfate (SDS), Triton X-100, or polyethylene glycole (PEG) improves pattern resolution and controls deposit morphology but leads to slightly reduced purity. High resolution nested lines with a 100 nm pitch are obtained from CuSO4–H2SO4–SDS–H2O. Higher aspect ratios (~1:1) with reduced line edge roughness and unintended deposition are obtained from CuSO4–H2SO4–PEG–H2O. Evidence for radiation-chemical deposition mechanisms was observed, including deposition efficiency as high as 1.4 primary electrons/Cu atom.
Document Type
Article
Publication Date
3-24-2017
Digital Object Identifier (DOI)
https://doi.org/10.1088/1361-6528/aa5a4a
Funding Information
This material is based upon work supported by the National Science Foundation under Grant Numbers CMMI-1125998, CMMI-1538650, and ECCS-1542164.
Related Content
Supplementary material for this article is available online.
Repository Citation
Esfandiarpour, Samaneh; Boehme, Lindsay; and Hastings, J. Todd, "Focused Electron Beam Induced Deposition of Copper with High Resolution and Purity from Aqueous Solutions" (2017). Electrical and Computer Engineering Faculty Publications. 32.
https://uknowledge.uky.edu/ece_facpub/32
Supplementary Information
Notes/Citation Information
Published in Nanotechnology, v. 28, no. 12, 125301, p. 1-14.
© 2017 IOP Publishing Ltd.
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