Pentacene-based nanorods on Au(111) single crystals: Charge transfer, diffusion, and step-edge barriers
nanorod assembly, substituted pentacene, electronic structures/ processes/mechanisms, organic electronics, charge transfer, diffusion and step-edge barrier
We investigate nanorod assemblies of two δ4-substituted pentacenes, namely (2,3-X2-9,10-Y2)-substituted pentacenes with X = Y = OCH3 (MOP) and with X = F, Y = OCH3 (MOPF), grown on Au(111) single crystals. By using a multi-technique approach based on ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption, we find evidence for charge transfer screening at the interface with gold. Furthermore, the MOP and MOPF nanorods show a rough surface morphology, which was investigated with atomic force microscopy. We use molecular simulation techniques to investigate the energetic barriers to diffusion and to traverse step-edges to estimate their influence on the nanorod roughness. We find that barriers to surface diffusion on a terrace are anisotropic and that their direction favors the formation of nanorods in these materials.
Tsinghua University Press
Sabine-Antonia Savu,Sabine Abb,Simon Schundelmeier,Jonathan D. Saathoff,James M. Stevenson,Christina Tönshoff,Holger F. Bettinger,Paulette Clancy,M. Benedetta Casu,Thomas Chassé, Pentacene-based nanorods on Au(111) single crystals: Charge transfer, diffusion, and step-edge barriers. NanoRes.2013, 6(6): 449–459