Details

Autor(en) / Beteiligte

• Savu, Sabine-A
• Biddau, Giulio
• Pardini, Lorenzo
• Bula, Rafael
• Bettinger, Holger F
• Draxl, Claudia
• Chassé, Thomas
• Casu, M. Benedetta

Titel

Fingerprint of Fractional Charge Transfer at the Metal/Organic Interface

Ist Teil von

• Journal of physical chemistry. C, 2015-06, Vol.119 (22), p.12538-12544

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Although physisorption is a widely occurring mechanism of bonding at the organic/metal interface, contradictory interpretations of this phenomenon are often reported. Photoemission and X-ray absorption spectroscopy investigations of nanorods of a substituted pentacene, 2,3,9,10-tetrafluoropentacene, deposited on gold single crystals reveal to be fundamental to identify the bonding mechanisms. We find fingerprints of a fractional charge transfer from the clean metal substrate to the physisorbed molecules. This phenomenon is unambiguously recognizable by a nonrigid shift of the core-level main lines while the occupied states at the interface stay mostly unperturbed, and the unoccupied states experience pronounced changes. The experimental results are corroborated by first-principles calculations.