Evaluation of Thermal and Radiation Induced Chemistries of Metal Oxo-Hydroxo Clusters for Next-Generation Nanoscale Inorganic Resists

Richard P. Oleksak, Rose E. Ruther, Feixiang Luo, Jennie M. Amador, Shawn R. Decker, Milton N. Jackson, Joshua R. Motley, Jason K. Stowers, Darren W. Johnson, Eric L. Garfunkel, Douglas A. Keszler, Gregory S. Herman

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Thin films formed by the condensation of metal oxo-hydroxo clusters offer a promising approach to ultrahigh-resolution patterning including next-generation photolithography using extreme ultraviolet (EUV) radiation and electron-beam lithography. In this work, we elucidate the thermal and radiative mechanisms that drive the chemical transformations in these materials and therefore control the patterning performance. Beginning from aqueous hafnium clusters, peroxide and sulfate additions serve to modify the clusters and, upon spin coating to form a thin film, provide the chemical contrast necessary to create resist. The coordination and functionality of peroxide and sulfate in hafnium-based metal oxo-hydroxo clusters were monitored at various stages of the patterning process which provided insight into the chemical and structural evolution of the material. Peroxide serves as the radiation sensitive species while sulfate enhances solubility and controls the concentration of hydroxide in the films. Peroxide and hydroxide species decompose via radiative and thermal energy, respectively, to form hafnium oxide; controlling these processes is central to the function of the resist.

Original languageEnglish (US)
Pages (from-to)4548-4556
Number of pages9
JournalACS Applied Nano Materials
Volume1
Issue number9
DOIs
Publication statusPublished - Sep 28 2018

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Keywords

  • cluster
  • inorganic photoresist
  • lithography
  • metal oxide photoresist
  • nanopatterning
  • polyoxometalate

Cite this

Oleksak, R. P., Ruther, R. E., Luo, F., Amador, J. M., Decker, S. R., Jackson, M. N., ... Herman, G. S. (2018). Evaluation of Thermal and Radiation Induced Chemistries of Metal Oxo-Hydroxo Clusters for Next-Generation Nanoscale Inorganic Resists. ACS Applied Nano Materials, 1(9), 4548-4556. https://doi.org/10.1021/acsanm.8b00865