Organic functionalization of 3C-SiC surfaces

Sebastian J. Schoell, Matthias Sachsenhauser, Alexandra Oliveros, John Howgate, Martin Stutzmann, Martin S. Brandt, Christopher L. Frewin, Stephen E. Saddow, Ian D. Sharp

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

We demonstrate the functionalization of n-type (100) and (111) 3C-SiC surfaces with organosilanes. Self-assembled monolayers (SAMs) of amino-propyldiethoxymethylsilane (APDEMS) and octadecyltrimethoxysilane (ODTMS) are formed via wet chemical processing techniques. Their structural, chemical, and electrical properties are investigated using static water contact angle measurements, atomic force microscopy, and X-ray photoelectron spectroscopy, revealing that the organic layers are smooth and densely packed. Furthermore, combined contact potential difference and surface photovoltage measurements demonstrate that the heterostructure functionality and surface potential can be tuned by utilizing different organosilane precursor molecules. Molecular dipoles are observed to significantly affect the work functions of the modified surfaces. Furthermore, the magnitude of the surface band bending is reduced following reaction of the hydroxylated surfaces with organosilanes, indicating that partial passivation of electrically active surface states is achieved. Micropatterning of organic layers is demonstrated by lithographically defined oxidation of organosilane-derived monolayers in an oxygen plasma, followed by visualization of resulting changes of the local wettability, as well as fluorescence microscopy following immobilization of fluorescently labeled BSA protein.

Original languageEnglish
Pages (from-to)1393-1399
Number of pages7
JournalACS Applied Materials and Interfaces
Volume5
Issue number4
DOIs
StatePublished - 27 Feb 2013

Keywords

  • XPS
  • functionalization
  • monolayer
  • silicon carbide
  • surface photovoltage
  • work function

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