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Na adsorption on the layered semiconductors SnS2 and WSe2 |
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| Affiliation: | 1. Université de Carthage, Laboratoire de Physique des Matériaux, Unité de Service Commun Spectromètre de Surfaces, Faculté des Sciences de Bizerte, 7021 Jarzouna, Bizerte, Tunisia;2. Institut de Science des Matériaux de Mulhouse (IS2M), UMR 7361 CNRS–UHA, Université de Haute Alsace, 3bis rue Alfred Werner, 68093 Mulhouse, France |
| Abstract: | The interaction of Na metal deposits with UHV cleaved van der Waals surfaces (0001) of SnS2 and WSe2 was investigated with SXPS and LEED. For SnS2 an insertion reaction (intercalation) of Na leads to a reduced Sn-species. For WSe2“non-reactive” intercalation occurs at room temperature which follows the rigid band model. At 120 K a metallic Na overlayer is formed. The observed reactivity is discussed in terms of bulk thermodynamics and the obtained difference is tentatively related to differences in the electronic structure of the compounds. |
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