Substrate influence for the Zn-tetraphenyl-porphyrin adsorption geometry and the interface-induced electron transfer.
In molecular devices, the importance of interfaces cannot be neglected as they determine charge injection and charge flow and, therefore, the device performance. Herein we report on the interaction of one single layer of Zn-tetraphenyl-porphyrin with Ag(110) and Si(111). Photoemission, near-edge X-ray absorption, and resonant photoemission are used to study the bonding nature, the adsorption geometry as well as the dynamics of electron transfer between the molecules and the metal or semiconductor surfaces. Molecule-substrate charge transfer is driven by the overlap with the molecular pi orbitals. In particular, the coupling of the phenyl legs with the substrate and the relative excited charge injection are dramatically different for the two surfaces considered.
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Carla
C
Castellarin-Cudia
Patrizia
P
Borghetti
Giovanni
G
Di Santo
Mattia
M
Fanetti
Rosanna
R
Larciprete
Cinzia
C
Cepek
Paolo
P
Vilmercati
Luigi
L
Sangaletti
Alberto
A
Verdini
Albano
A
Cossaro
Luca
L
Floreano
Alberto
A
Morgante
Andrea
A
Goldoni