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Low-Energy Electron Irradiation Damage in Few-Monolayer Pentacene Films

[Image: see text] Crystalline films of pentacene molecules, two to four monolayers in thickness, are grown via in situ sublimation on silicon substrates in the ultrahigh vacuum chamber of a low-energy electron microscope. It is observed that the diffraction pattern of the pentacene layers fades upon...

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Autores principales: Tebyani, A., Baalbergen, F. B., Tromp, R. M., van der Molen, S. J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8647077/
https://www.ncbi.nlm.nih.gov/pubmed/34887975
http://dx.doi.org/10.1021/acs.jpcc.1c06749
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author Tebyani, A.
Baalbergen, F. B.
Tromp, R. M.
van der Molen, S. J.
author_facet Tebyani, A.
Baalbergen, F. B.
Tromp, R. M.
van der Molen, S. J.
author_sort Tebyani, A.
collection PubMed
description [Image: see text] Crystalline films of pentacene molecules, two to four monolayers in thickness, are grown via in situ sublimation on silicon substrates in the ultrahigh vacuum chamber of a low-energy electron microscope. It is observed that the diffraction pattern of the pentacene layers fades upon irradiation with low-energy electrons. The damage cross section is found to increase by more than an order of magnitude for electron energies from 0 to 10 eV and by another order of magnitude from 10 to 40 eV. Close to 0 eV, damage is virtually nil. Creation of chemically reactive atomic centers after electron attachment or impact ionization is thought to trigger chemical reactions between neighboring molecules that gradually transform the layer into a disordered carbon nanomembrane. Additionally, diminishing spectroscopic features related to the unoccupied band structure of the layers, accompanied by loss of definition in real-space images, and an increase in the background intensity of diffraction images during irradiation point to chemical changes and formation of a disordered layer.
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spelling pubmed-86470772021-12-07 Low-Energy Electron Irradiation Damage in Few-Monolayer Pentacene Films Tebyani, A. Baalbergen, F. B. Tromp, R. M. van der Molen, S. J. J Phys Chem C Nanomater Interfaces [Image: see text] Crystalline films of pentacene molecules, two to four monolayers in thickness, are grown via in situ sublimation on silicon substrates in the ultrahigh vacuum chamber of a low-energy electron microscope. It is observed that the diffraction pattern of the pentacene layers fades upon irradiation with low-energy electrons. The damage cross section is found to increase by more than an order of magnitude for electron energies from 0 to 10 eV and by another order of magnitude from 10 to 40 eV. Close to 0 eV, damage is virtually nil. Creation of chemically reactive atomic centers after electron attachment or impact ionization is thought to trigger chemical reactions between neighboring molecules that gradually transform the layer into a disordered carbon nanomembrane. Additionally, diminishing spectroscopic features related to the unoccupied band structure of the layers, accompanied by loss of definition in real-space images, and an increase in the background intensity of diffraction images during irradiation point to chemical changes and formation of a disordered layer. American Chemical Society 2021-11-18 2021-12-02 /pmc/articles/PMC8647077/ /pubmed/34887975 http://dx.doi.org/10.1021/acs.jpcc.1c06749 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Tebyani, A.
Baalbergen, F. B.
Tromp, R. M.
van der Molen, S. J.
Low-Energy Electron Irradiation Damage in Few-Monolayer Pentacene Films
title Low-Energy Electron Irradiation Damage in Few-Monolayer Pentacene Films
title_full Low-Energy Electron Irradiation Damage in Few-Monolayer Pentacene Films
title_fullStr Low-Energy Electron Irradiation Damage in Few-Monolayer Pentacene Films
title_full_unstemmed Low-Energy Electron Irradiation Damage in Few-Monolayer Pentacene Films
title_short Low-Energy Electron Irradiation Damage in Few-Monolayer Pentacene Films
title_sort low-energy electron irradiation damage in few-monolayer pentacene films
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8647077/
https://www.ncbi.nlm.nih.gov/pubmed/34887975
http://dx.doi.org/10.1021/acs.jpcc.1c06749
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