Adsorption of selenium atoms at the Si(1 1 1)-7 × 7 surface: A combination of scanning tunnelling microscopy and density functional theory studies

► STM and DFT are used to study the adsorption properties of Se atoms on a Si surface. ► The adsorption site of Se atom on the Si surface has been identified. ► The electronic effect of Se atom on the adsorbed Si surface has been ivestigaed. ► The Se atom weakens the bond between two Si atom bonding with the Se atom.