Lecture Fabrizio Evangelista
|10 december 2004||FWN-Building 5113.0201, Nijenborgh 4, 9747 AG, Groningen|
|Speaker:||Dr. Fabrizio Evangelista|
|Affiliation:||University of Rome|
|Title:||The role of molecule-substrate interaction in driving electronic and structural properties at the interface: the case of CuPc/Al(100) and CuPc/Au(110)-1x2 organic-inorganic systems|
|Date:||Fri Dec 10, 2004|
|Telephone:||+31 50 363 4736 / 4974 (secr.)|
Presently, organic-inorganic interfaces represent one of the most widely addressed subjects of research, as they are considered the fundamental building blocks of molecular electronics devices. One of the key factors in the comprehension of these heterostructures is the nature of the substrate-molecule interaction. Here, I present some results on ultrathin copper-phthalocyanine (CuPc) films deposited on two metal surfaces, Al(100) and Au(110)-1x2, differing for both electronic and geometrical aspects, with the aim of singling out the role of the molecule-substrate interaction in driving both the electronic properties and the structural morphology at the interface.
The coupling of electronic spectroscopies (XPS, UPS, NEXAFS) and diffraction techniques (GIXD, LEED) was employed to address the problem. The high density of nearly free electrons available in the Al substrate is found to allow a sizeable charge transfer, deeply affecting the electronic structure as well as the growth morphology of the molecule at the interface. Regarding the CuPc/Au interface, the molecule-substrate interaction gives rise to a well ordered 2D phase at the monolayer stage with the contextual formation of pi-d interaction states.
|Laatst gewijzigd:||22 oktober 2012 14:30|