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Low-Energy Electron Irradiation Damage in Few-Monolayer Pentacene Films
A Tebyani1, F B Baalbergen1, R M Tromp1,2
1Huygens-Kamerlingh Onnes Laboratorium, Leiden Institute of Physics, Leiden University, Niels Bohrweg 2, P.O. Box 9504, NL-2300 RA Leiden, The Netherlands.
The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|December 10, 2021
Summary
Low-energy electron irradiation damages thin pentacene films, transforming them into disordered carbon nanomembranes. Damage increases significantly with electron energy, especially above 10 eV.
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- Pentacene thin films are crucial organic semiconductors.
- Understanding their stability under electron irradiation is vital for device applications.
Purpose of the Study:
- To investigate the effects of low-energy electron irradiation on crystalline pentacene films.
- To characterize the damage mechanisms and resulting structural changes.
Main Methods:
- In situ sublimation of pentacene films (2-4 monolayers) on silicon substrates.
- Observation using a low-energy electron microscope (LEEM).
- Analysis of diffraction patterns and spectroscopic features during electron irradiation.
Main Results:
- Electron irradiation causes diffraction patterns to fade, indicating layer damage.
- Damage cross-section increases significantly with electron energy (0-10 eV and 10-40 eV).
- Spectroscopic and imaging data reveal chemical changes and formation of a disordered carbon nanomembrane.
Conclusions:
- Low-energy electrons induce chemical transformations in pentacene films.
- Electron-induced damage is energy-dependent and leads to nanomembrane formation.
- These findings are critical for the stability and application of pentacene-based organic electronics.
