Scanning tunneling microscopy study of organometallic molecules adsorbed on a GaAs(001)-2×4 surface

Abstract

The interaction of tertiarybutylarsine (TBAs), triisobutylgallium (TiBGa) and trisdimethylaminoarsenic (TDMAAs) with the GaAs(001)-2×4 surface is studied by scanning tunneling microscope. No adsorbates were observed after TBAs exposure at room temperature. In the case of TiBGa and TDMAAs, adsorbates were observed on the As dimer rows. They were adsorbed randomly at low coverage and formed a 4×4 structure at a full monolayer. Weak interaction between molecules and the GaAs surface is expected because the 2×4 structure of the clean surface was kept under the adsorbates.