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Bismuth Selenide (Bi2Se3) is a topological insulator with a two-dimensionallayered structure that enables clean and well-ordered surfaces to be preparedby cleaving. Although some studies have demonstrated that the cleaved surfaceis terminated with Se, as expected from the bulk crystal structure, otherreports have indicated either a Bi- or mixed-termination. Low energy ionscattering (LEIS), low energy electron diffraction (LEED) and x-rayphotoelectron spectroscopy (XPS) are used here to compare surfaces prepared byex situ cleaving, in situ cleaving, and ion bombardment and annealing (IBA) inultra-high vacuum (UHV). Surfaces prepared by in situ cleaving and IBA are wellordered and Se-terminated. Ex situ cleaved samples could be eitherSe-terminated or Bi-rich, are less well ordered and have adsorbed contaminants.This suggests that a chemical reaction involving atmospheric contaminants,which may preferentially adsorb at surface defects, could contribute to thenon-reproducibility of the termination.

Termination of Single Crystal Bi2Se3 Surfaces Prepared by Various Methods