Adsorption of potassium on GaAs(110)

The adsorption of potassium on the GaAs(110) surface has been studied by io n scattering and recoiling spectroscopy (SARS) and Auger electron spectrosc opy (AES). The SARS measurements indicate that a major part of the potassiu m atoms adsorb along the [001] gallium rows, in a region close to the sites of a new arsenic layer, and that only a miller Dart of the potassium atoms adsorb along the [001] arsenic rows. In agreement with this suggestion, th e energy shifts in the substrate Auger peaks indicate that, at the beginnin g of the adsorption, the potassium atoms react preferentially with gallium atoms. (C) 2000 Elsevier Science B.V. All rights reserved.