Abstract
Interfacial electronic structures of copper-phthalocyanine (CuPc), cobalt-phthalocyanine (CoPc), and graphene were investigated experimentally by using photoelectron spectroscopy. While the CuPc/graphene interface shows flat band structure and negligible interfacial dipole indicating quite weak molecule-substrate interaction, the CuPc/CoPc/graphene interface shows a large interfacial dipole and obvious energy level bending. Controlled experiments ruled out possible influences from the change in film structure of CuPc and pure π-π interaction between CoPc and CuPc. Analysis based on X-ray photoelectron spectroscopy and density functional theory reveals that the decrease in the work function for the CuPc/CoPc/graphene system is induced by the intermolecular interaction between CuPc and CoPc which is enhanced owning to the peculiar electronic properties at the CoPc-graphene interface.
| Original language | English |
|---|---|
| Article number | 134706 |
| Journal | Journal of Chemical Physics |
| Volume | 143 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - 7 Oct 2015 |
Publisher's Copyright Statement
- COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Wei-Dong Dou, Shu-Ping Huang, and Chun-Sing Lee , "Graphene-enhanced intermolecular interaction at interface between copper- and cobalt-phthalocyanines", J. Chem. Phys. 143, 134706 (2015) and may be found at https://doi.org/10.1063/1.4932192.