Real-time observation of atomic layer deposition inhibition: Metal oxide growth on self-assembled alkanethiols

Jason R. Avila, Erica J. Demarco, Jonathan D. Emery, Omar K. Farha, Michael J. Pellin, Joseph T. Hupp, Alex B.F. Martinson

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Through in situ quartz crystal microbalance (QCM) monitoring, we resolve the growth of a self-assembled monolayer (SAM) and subsequent metal oxide deposition with high resolution. We introduce the fitting of mass deposited during each atomic layer deposition (ALD) cycle to an analytical island-growth model that enables quantification of growth inhibition, nucleation density, and the uninhibited ALD growth rate. A long-chain alkanethiol was self-assembled as a monolayer on gold-coated quartz crystals in order to investigate its effectiveness as a barrier to ALD. Compared to solution-loading, vapor-loading is observed to produce a SAM with equal or greater inhibition ability in minutes vs days. The metal oxide growth temperature and the choice of precursor also significantly affect the nucleation density, which ranges from 0.001 to 1 sites/nm2. Finally, we observe a minimum 100 cycle inhibition of an oxide ALD process, ZnO, under moderately optimized conditions.

Original languageEnglish
Pages (from-to)11891-11898
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number15
DOIs
Publication statusPublished - Aug 13 2014

Keywords

  • alkanethiol
  • analytical methods
  • atomic layer deposition
  • in situ
  • quartz crystal microbalance
  • self-assembled monolayers

ASJC Scopus subject areas

  • Materials Science(all)

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