AVS 50th International Symposium
    Contacts to Organic Materials Topical Conference Monday Sessions
       Session OM-MoA

Invited Paper OM-MoA1
Characterization of Organic-Metal and Organic-Organic Interfaces

Monday, November 3, 2003, 2:00 pm, Room 318/319

Session: Contacts to Molecules and Molecular Films (II)
Presenter: J.L. Bredas, Georgia Institute of Technology
Correspondent: Click to Email
In organics-based (opto)electronic devices, organic/metal and organic/organic interfaces play a key role in determining the device performance. Here, we focus first on the interface dipole present at organic-on-metal interfaces. The origin of this dipole is rationalized from the results of a joint experimental and theoretical study based on the interaction between pi-conjugated molecules and transition metal surfaces. It is found that the interface dipole formed at the organic/metal interface can be divided into two contributions: (i) the first corresponds to the "chemical" dipole induced by a partial charge transfer between the organic layers and the metal upon chemisorption of the organic molecules on the metal surface; and (ii) the second relates to the change in metal surface dipole due to the modification of the metal electron density tail that is induced by the presence of the adsorbed organic molecules. In a second part, we investigate the electronic structure of metal-on-oligomer and organic/organic interfaces.