Interaction of atomic hydrogen with cleaved InP. I. The adsorption stage

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Abstract
The interaction of atomic hydrogen with the (110) face of InP, prepared by cleavage under ultrahigh vacuum, has been studied by Auger electron spectroscopy, electron energy-loss spectroscopy, low-energy electron diffraction, and photoemission yield spectroscopy. The interaction occurs in two stages: first, an adsorption of H, then a decomposition of the substrate. The adsorption stage is characterized by the covalent bonding of, most likely, one H atom per surface unit cell which induces a change in the surface reconstruction of the substrate, the surface unit mesh remaining 1×1. A hydrogen-induced surface state band, about 0.26 eV wide, is observed around 0.06 eV below the valence-band edge. Upon H adsorption, the Fermi level gets pinned in the gap at about 0.4 eV below the conduction-band edge on both n- and p-type samples, while the ionization energy decreases, the decrease reaching 0.35 eV at saturation.

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