Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 130, Issue 23, Pages 7300-7304Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja800286k
Keywords
-
Categories
Ask authors/readers for more resources
The interfaces formed between pentacene (PEN) and perfluoropentacene (PFP) molecules and Cu(1 11) were studied using photoelectron spectroscopy, X-ray standing wave (XSW), and scanning tunneling microscopy measurements, in conjunction with theoretical modeling. The average carbon bonding distances for PEN and PFP differ strongly, that is, 2.34 angstrom for PEN versus 2.98 angstrom for PFP. An adsorption-induced nonplanar conformation of PFP is suggested by XSW (F atoms 0.1 angstrom above the carbon plane), which causes an intramolecular dipole of similar to 0.5 D. These observations explain why the hole injection barriers at both molecule/metal interfaces are comparable (1.10 eV for PEN and 1.35 eV for PFP) whereas the molecular ionization energies differ significantly (5.00 eV for PEN and 5.85 eV for PFP). Our results show that the hypothesis of charge injection barrier tuning at organic/metal interfaces by adjusting the ionization energy of molecules is not always readily applicable.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available