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Proceedings Paper

Water-induced modifications of GaP(100) and InP(100) surfaces studied by photoelectron spectroscopy and reflection anisotropy spectroscopy
Author(s): Matthias M. May; Oliver Supplie; Christian Höhn; Wolf-Dietrich Zabka; Hans-Joachim Lewerenz; Roel van de Krol; Thomas Hannappel
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Paper Abstract

In this work, we investigate the initial interaction of water and oxygen with different surface reconstructions of GaP(100) applying photoelectron spectroscopy, low-energy electron diffraction, and reflection anisotropy spectroscopy. Surfaces were prepared by metal-organic vapour phase epitaxy, transferred to ultra-high vacuum, and exposed to oxygen or water vapour at room temperature. The (2 4) reconstructed, Ga-rich surface is more sensitive and reactive to adsorption, bearing a less ordered surface reconstruction upon exposure and indicating a mixture of dissociative and molecular water adsorption. The p(2 2)=c(4 2) P-rich surface, on the other hand, is less reactive, but shows a new surface symmetry after water adsorption. Correlating findings of photoelectron spectroscopy with reflection anisotropy spectroscopy could pave the way towards optical in-situ monitoring of electrochemical surface modifications with reflection anisotropy spectroscopy.

Paper Details

Date Published: 16 September 2013
PDF: 7 pages
Proc. SPIE 8822, Solar Hydrogen and Nanotechnology VIII, 88220M (16 September 2013); doi: 10.1117/12.2026172
Show Author Affiliations
Matthias M. May, Helmholtz-Zentrum Berlin für Materialien und Energie (Germany)
Humboldt-Univ. zu Berlin (Germany)
Oliver Supplie, Helmholtz-Zentrum Berlin für Materialien und Energie (Germany)
Humboldt-Univ. zu Berlin (Germany)
Christian Höhn, Helmholtz-Zentrum Berlin für Materialien und Energie (Germany)
Wolf-Dietrich Zabka, Helmholtz-Zentrum Berlin für Materialien und Energie (Germany)
Humboldt-Univ. zu Berlin (Germany)
Hans-Joachim Lewerenz, Helmholtz-Zentrum Berlin für Materialien und Energie (Germany)
California Institute of Technology (United States)
Roel van de Krol, Helmholtz-Zentrum Berlin für Materialien und Energie (Germany)
Thomas Hannappel, Helmholtz-Zentrum Berlin für Materialien und Energie (Germany)
Technische Univ. Ilmenau (Germany)


Published in SPIE Proceedings Vol. 8822:
Solar Hydrogen and Nanotechnology VIII
Yosuke Kanai; David Prendergast, Editor(s)

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