Heteroorganic layers of CuPc and PTCDA on the Ag(110) surface

The application potential of organic semiconductors for molecular electronics makes them interesting for fundamental research. Layers consisting only of one type of molecules have been investigated extensively over the last decades. Layers consisting of two different types of organic molecules, e.g. CuPc and PTCDA on the Ag(111) surface [1], are now subject of experiments. In this case, not only the interaction between the metal and the organic substance but also the molecule-molecule interaction is in the focus of research.We present investigations on mixed layers of CuPc and PTCDA on the Ag(110) surface, which is meant to be more reactive than the Ag(111) surface. The lateral arrangement is studied by low temperature scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). The analysis of local electronic properties was done using scanning tunneling spectroscopy (STS).[1] Stadtmüller et al., PRL 108, (106103) 201