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The effect of oxygen exposure on pentacene electronic structure
A Vollmer1, O D Jurchescu, I Arfaoui
1Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung m.b.H., Berlin, Germany.
The European Physical Journal. E, Soft Matter
|June 22, 2005
Summary
Oxygen exposure impacts pentacene
Area of Science:
- Organic electronics
- Materials science
- Surface chemistry
Background:
- Pentacene is a model organic semiconductor.
- Understanding environmental interactions is crucial for device stability.
Purpose of the Study:
- Investigate oxygen and air effects on pentacene electronic structure.
- Determine reactivity and doping mechanisms.
Main Methods:
- Ultraviolet photoelectron spectroscopy (UPS) on pentacene single crystals and thin films.
- Exposure to oxygen (O2), air, singlet oxygen/ozone, and water.
Main Results:
- O2 and water show minimal reaction with pentacene.
- Singlet oxygen/ozone readily oxidize pentacene.
- No significant p-type doping by O2 observed at low pressure.
- Oxygen exposure reduces the Au-pentacene hole injection barrier by 0.25 eV.
- Surface modification of Au is the likely cause for barrier reduction.
Conclusions:
- Pentacene stability varies with oxygen species.
- O2 interaction primarily modifies interfaces rather than bulk doping.
- Surface effects dominate charge injection barrier changes.