Ultraviolet-photoemission-spectroscopy study of the interaction of atomic hydrogen with cleaved InP: A valence-band contribution

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Abstract
Angular-resolved ultraviolet-photoemission spectroscopy has been used to follow the evolution of the valence-band spectrum of InP(110), cleaved in ultrahigh vacuum, at particular stages of its interaction with atomic hydrogen. Photons in 17–65-eV energy range were used, and electrons at normal emission were energy analyzed. During the first interaction stage, H bonds covalently to the substrate. It induces a removal of the P-associated surface states near the top of both parts of the valence band, and the growth of two additional structures around 4.5 and 6 eV below the valence-band edge. These evolutions arise from the bonding of H to P and very likely to In. The analysis indicates that the first interaction stage may be more complex than a mere adsorption. The decomposition stage at heavy hydrogenation is confirmed by a clear metallic Fermi edge from In and an evolution of the spectra compatible with the presence of an overlayer of P-hydrogenated species.