Journal
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
Volume 174, Issue 1-3, Pages 40-44Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.elspec.2009.04.008
Keywords
Organic heterostructures; Thermodynamic equilibrium; Energy level alignment; Photoelectron spectroscopy; Thin film morphology
Categories
Funding
- Emmy-NoetherProgram (DFG)
- [Sfb 448]
- [SPP 1355]
Ask authors/readers for more resources
The electronic structure of vacuum-sublimed layered organic heterostructures of pentacene (PEN) and fullerene (C-60) on conducting polymer substrates was investigated using ultraviolet photoelectron spectroscopy (UPS). The conditions at the PEN/C-60 interface changed from thermodynamic non-equilibrium (i.e. the onset of the PEN highest occupied molecular orbital above the substrate Fermi-energy) for thin PEN coverages on C-60 to thermodynamic equilibrium for thicker PEN coverages (i.e. Fermi-level pinning of PEN). This finding is attributed to a coverage-dependent pinhole connection of PEN through the C-60 layer with the substrate. The experiments demonstrate the importance of organic thin film morphology for UPS measurements to assess the energy level alignment at organic/organic heterointerfaces. (C) 2009 Elsevier B.V. All rights reserved.
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