Charge transfer and redistribution in the formation of the K/GaP(110) interface: A photoelectron spectroscopy study

S. D'Addato*, Paul Bailey, J. M.C. Thornton, D. A. Evans

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (SciVal)

Abstract

We present the results of a photoelectron spectroscopy study of the K/GaP(110) interface grown at T = 120 K. We have investigated the system looking at the Ga 3d and P 2p core level spectra by analysing their lineshape. This analysis shows that the transferred charge in the adatom-substrate bonding formation affects the electronic and chemical environment of both surface Ga and P atoms. The results suggest relevant differences with the intuitive picture of strong ionic localized bonding between the alkali atom and surface Ga. They are instead more consistent with a delocalized redistributed valence charge between the adsorbate and the substrate. We also conclude that the system at Θ = 1 ML is metallic, with an increasing disorder and inhomogeneity at the highest coverage studied. The similarities and differences with the Na/GaP(110) and the other alkali metal/GaAs(110) system are discussed.

Original languageEnglish
Pages (from-to)2861-2871
Number of pages11
JournalJournal of Physics Condensed Matter
Volume10
Issue number13
DOIs
Publication statusPublished - 06 Apr 1998

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