Self-assembly of F16ZnPc thin films and F16ZnPc-ZnPc heterostructures on deactivated Si surfaces studied by scanning tunneling microscopy.
Using scanning tunneling microscopy, we show that hexadecafluorinated zinc phthalocyanine (F16ZnPc) molecules form two morphologically different self-assembled structures that both display point-on-line coincident epitaxial registration with the deactivated Si(111)-B 3×3 surface. The packing motif in these structures suggests that fluorination of conjugated organic molecules can lead to stronger molecule-substrate interaction, π-π intermolecular interaction, and side-to-side intermolecular repulsion. The delicate balance and interplay between these interactions determine the self-assembly behavior of fluorinated molecules. Furthermore, we demonstrate the formation of vertically and laterally stacked F16ZnPc-ZnPc heterojunctions, allowing for future spectroscopy investigation of molecular electronic structures and charge transfer behavior at organic-organic hetero-interfaces.
Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA.
Andrew
A
Tan
Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA.
Sean
S
Wagner
Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA.
Pengpeng
P
Zhang