Abstract
We have studied the energy-level alignment of ex situ, acetone cleaned Co and Al2O3/Co contacts to
the organic semiconductors pentacene and rubrene by combined X-ray and ultraviolet photoemission
spectroscopy. Our results demonstrate that the work function under these conditions is smaller than
in the in situ cleaned, atomically clean case. Moreover, the studied interfaces are characterized by very
small, short range interfaces dipoles and substantial injection barriers for holes. This represents essential
information in view of their use in organic spintronic devices. Our core-level photoemission spectroscopy
measurements rule out chemical reactions.
Original language | Undefined |
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Pages (from-to) | 238-243 |
Number of pages | 6 |
Journal | Synthetic metals |
Volume | 160 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - Feb 2010 |
Keywords
- EWI-19217
- Spintronics
- Pentacene
- METIS-275825
- IR-75547
- Energy-level alignment
- Rubrene
- Photoemission spectroscopy