Cerium-induced reconstructions on the Si(1 1 1) surface

Scanning tunnelling microscopy has been used to investigate cerium-induced reconstructions on Si(1 1 1). Room temperature deposition of submonolayers of Ce is reactive and produces an intricate two layer silicide structure: a 7×7 phase on top of a 23×23 reconstruction, co-existing with the bare Si(1 1 1)-7 × 7 surface. ing the submonolayer-covered surface at 600 °C generates a one-dimensional (5 × 2) structure comprising both Ce and Si adatoms. This structure coexists with the bare 7 × 7 and a 2 × 3 structure with cerium adatoms in alternating H3 and T4 positions.