Adsorption and decomposition of ethylene (C2H4) on GaAs(100)

Y Chen, J C Barnard, L Siller, J Schmidt, R E Palmer, Yu Chen

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


An understanding of the interaction of organic molecules with semiconductors is important for both fundamental research and technological applications. With such knowledge, it may be possible to bond a wide range of useful organic molecules directly to the semiconductor surface. The adsorption of ethylene, C2H4, on the arsenic-terminated GaAs(100) surface has been studied using high-resolution electron energy-loss spectroscopy (HREELS). We find that ethylene molecules are chemisorbed on the surface in a near-sp(3) hybridisation state at 300 K. Conversion from the physisorption state at 100 K to the chemisorption state is observed when the sample temperature is raised to room temperature. The sticking coefficient for ethylene on the surface at 300 K is about two orders of magnitude lower than that at 100 K. The electron-stimulated desorption (ESD) with low-energy electrons (0-50 eV) of the physisorbed species leads to quite different behaviour than heating; specifically, the desorption of H+ and CH3+ ions is due to C-H and C=C bond scission. respectively. (C) 1999 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)192-198
Number of pages7
JournalSurface Science
Issue number1
Publication statusPublished - 20 Oct 1999


  • adsorption
  • electron energy loss spectroscopy
  • electron stimulated desorption (ESD)
  • hydrocarbons
  • III-V semiconductors
  • surface molecules


Dive into the research topics of 'Adsorption and decomposition of ethylene (C2H4) on GaAs(100)'. Together they form a unique fingerprint.

Cite this