Abstract
Utilizing the substrate of Ga bilayer grown on Si(1 1 1)-√3 × √3-Ga, we have investigated the structural transition of pentacene monolayer induced by moderate annealing. Short-range ordering has been observed in the monolayer pentacene deposited at room temperature. Annealing the sample at ∼350 K produced ordered pentacene monolayer with the "brick- wall" adsorption pattern. The STM images with sub-molecular resolution revealed that the orbital symmetry of the HOMO is reduced from D2h to C2v, due to the substrate-molecule interaction, while the deeper HOMO-1 orbital remains intact. Further annealing at ∼400 K led to the formation of molecular dimers as well as the structural transition from "brick-wall" packing to "herringbone" pattern.
Original language | English |
---|---|
Pages (from-to) | 80-88 |
Number of pages | 9 |
Journal | Surface Science |
Volume | 579 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2005 Mar 20 |
Keywords
- Gallium bilayer
- Molecule-solid reaction
- Pentacene
- Scanning tunneling microscopy
- Surface structure
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry