Directed Self-Assembly and Pattern Transfer of Five Nanometer Block Copolymer Lamellae

Austin P. Lane, Xiaomin Yang, Michael J. Maher, Gregory Blachut, Yusuke Asano, Yasunobu Someya, Akhila Mallavarapu, Stephen M. Sirard, Christopher J. Ellison, C. Grant Willson

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102 Scopus citations


The directed self-assembly (DSA) and pattern transfer of poly(5-vinyl-1,3-benzodioxole-block-pentamethyldisilylstyrene) (PVBD-b-PDSS) is reported. Lamellae-forming PVBD-b-PDSS can form well resolved 5 nm (half-pitch) features in thin films with high etch selectivity. Reactive ion etching was used to selectively remove the PVBD block, and fingerprint patterns were subsequently transferred into an underlying chromium hard mask and carbon layer. DSA of the block copolymer (BCP) features resulted from orienting PVBD-b-PDSS on guidelines patterned by nanoimprint lithography. A density multiplication factor of 4× was achieved through a hybrid chemo-/grapho-epitaxy process. Cross-sectional scanning tunneling electron microscopy/electron energy loss spectroscopy (STEM/EELS) was used to analyze the BCP profile in the DSA samples. Wetting layers of parallel orientation were observed to form unless the bottom and top surface were neutralized with a surface treatment and top coat, respectively.

Original languageEnglish (US)
Pages (from-to)7656-7665
Number of pages10
JournalACS nano
Issue number8
StatePublished - Aug 22 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.


  • bit-patterned media
  • block copolymer
  • directed self-assembly
  • lithography
  • nanoimprint lithography
  • nanopatterning


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