期刊
SURFACE SCIENCE
卷 577, 期 2-3, 页码 127-138出版社
ELSEVIER
DOI: 10.1016/j.susc.2005.01.004
关键词
density functional calculations; surface electronic structure; semiconducting surfaces; tin oxide
Features of SnO2(1 1 0) surfaces with a surplus electron are considered computationally by applying density functional method. The additional charge is found to influence on surface energetics and surface relaxations considerably with respect to the corresponding surfaces without additional charge. This effect is pronounced in the cases of oxidized surfaces, where different oxygen adsorbates (O, O-2 and O-3) tend to capture the charge. On stoichiometric surface, these oxygen species are adsorbed on-top of the five-fold coordinated surface tin atoms and are attributed to adsorbed O-, O-2(-) and O-3(-) species associated with spin polarization. Based on evaluated total energy differences formation of these species are compared. In cases of stoichiometric and slightly oxygen deficient surfaces without adsorbates, charge accumulation is qualitatively similar to the case of bulk SnO2 with a considerable amount of the surplus charge enriched around Sri atoms. A pronounced charge accumulation is observed around under-coordinated surface tin atoms of stoichiometric and oxygen deficient (110) surfaces. (C) 2005 Elsevier B.V. All rights reserved.
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