The role of Na in the promotion of the Ge(111) surface oxidation has been studied. The sites that reacted with oxygen were recognized by the contrast change in the electron tunneling images. On the clean Ge(111) surface, oxidation began at the defect sites and domain boundaries.With Na on the surface, the initial oxidation also occurred at the sites where Na adsorbed. As the oxygen dosage increased, the oxidized area expanded laterally from the initial oxidation sites. The result indicates that Na adsorption promoted the surface oxidation by providing extra oxidation centers.
|Journal||Applied Physics A: Materials Science and Processing|
|Issue number||SUPPL. 1|
|Publication status||Published - 1998 Dec 1|
ASJC Scopus subject areas
- Materials Science(all)