Barrier formation at organic interfaces in a Cu(100)-benzenethiolate-pentacene heterostructure.
The energy level alignment at the metal-organic and organic-organic interfaces of the Cu(100)/benzenethiolate/pentacene heterostructure is studied by photoemission spectroscopy and discussed theoretically using a model that includes, in a consistent way, charge transfer, Pauli repulsion, intrinsic molecular dipoles, and interface screening as a function of coverage. Despite the different nature of the two interfaces, our model provides a unified explanation for the work-function changes at both junctions and enables us to determine the benzenethiolate orientation as a function of coverage.
Betti
M G
MG
Dipartimento di Fisica, Università di Roma La Sapienza, P. le Aldo Moro 2, I-00185 Roma, Italy.
Kanjilal
A
A
Mariani
C
C
Vázquez
H
H
Dappe
Y J
YJ
Ortega
J
J
Flores
F
F