Regensburg 2013 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

O: Fachverband Oberflächenphysik

O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)

O 35.19: Poster

Tuesday, March 12, 2013, 18:15–21:45, Poster B1

Formation of NTCDA and CuPc (hetero-) organic phases on Ag (111) — •Sonja Schröder, Benjamin Stadtmüller, Christian Wagner, Martin Willenbockel, Christoph Kleimann, Sergey Subach, and Christian Kumpf — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany and Jülich-Aachen Research Alliance (JARA) - Fundamentals of Future Information Technology

The future development of organic devices like solar cells, OLEDs or OFLETs is based on the understanding of the interactions at organic-metal and organic-organic interfaces. In particular, charge transfer and the bonding strength across the interface are important, which in turn depend on the structure and molecular orientation. PTCDA, NTCDA and CuPc are prototypical molecules which have been studied intensively in this context in the last years. Here we report on the adsorption of NTCDA on Ag (111) and on NTCDA-CuPc-heteroorganic films. We present a modified brick wall model for NTCDA on Ag (111) with the molecules oriented perpendicular to the [-1 1 0] direction. This model is based on scanning tunneling microscopy (STM) measurements, pair potential calculations, a LEED I-V analysis and angle resolved photoemission (ARPES) results. Furthermore, we have investigated mixed layers of CuPc and NTCDA at different coverages on the same surface. Three different phases could be identified by SPA-LEED: A NTCDA rich-, a "1:1"- and a CuPc rich phase. The NTCDA- and the CuPc rich phases are commensurate structures. ARPES studies were performed for investigating the electronic properties.