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Postadsorption Work Function Tuning via Hydrogen Pressure Control
[Image: see text] The work function of metal substrates can be easily tuned, for instance, by adsorbing layers of molecular electron donors and acceptors. In this work, we discuss the possibility of changing the donor/acceptor mixing ratio reversibly after adsorption by choosing a donor/acceptor pai...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical
Society
2015
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4671103/ https://www.ncbi.nlm.nih.gov/pubmed/26692915 http://dx.doi.org/10.1021/acs.jpcc.5b08827 |
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author | Edlbauer, Hermann Zojer, Egbert Hofmann, Oliver T. |
author_facet | Edlbauer, Hermann Zojer, Egbert Hofmann, Oliver T. |
author_sort | Edlbauer, Hermann |
collection | PubMed |
description | [Image: see text] The work function of metal substrates can be easily tuned, for instance, by adsorbing layers of molecular electron donors and acceptors. In this work, we discuss the possibility of changing the donor/acceptor mixing ratio reversibly after adsorption by choosing a donor/acceptor pair that is coupled via a redox reaction and that is in equilibrium with a surrounding gas phase. We discuss such a situation for the example of tetrafluoro-1,4-benzenediol (TFBD)/tetrafluoro-1,4-benzoquinone (TFBQ), adsorbed on Cu(111) and Ag(111) surfaces. We use density functional theory and ab initio thermodynamics to show that arbitrary TFBD/TFBQ mixing ratios can be set using hydrogen pressures attainable in low to ultrahigh vacuum. Adjusting the mixing ratio allows modifying the work function over a range of about 1 eV. Finally, we contrast single-species submonolayers with mixed layers to discuss why the resulting inhomogeneities in the electrostatic energy above the surface have different impacts on the interfacial level alignment and the work function. |
format | Online Article Text |
id | pubmed-4671103 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | American Chemical
Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-46711032015-12-09 Postadsorption Work Function Tuning via Hydrogen Pressure Control Edlbauer, Hermann Zojer, Egbert Hofmann, Oliver T. J Phys Chem C Nanomater Interfaces [Image: see text] The work function of metal substrates can be easily tuned, for instance, by adsorbing layers of molecular electron donors and acceptors. In this work, we discuss the possibility of changing the donor/acceptor mixing ratio reversibly after adsorption by choosing a donor/acceptor pair that is coupled via a redox reaction and that is in equilibrium with a surrounding gas phase. We discuss such a situation for the example of tetrafluoro-1,4-benzenediol (TFBD)/tetrafluoro-1,4-benzoquinone (TFBQ), adsorbed on Cu(111) and Ag(111) surfaces. We use density functional theory and ab initio thermodynamics to show that arbitrary TFBD/TFBQ mixing ratios can be set using hydrogen pressures attainable in low to ultrahigh vacuum. Adjusting the mixing ratio allows modifying the work function over a range of about 1 eV. Finally, we contrast single-species submonolayers with mixed layers to discuss why the resulting inhomogeneities in the electrostatic energy above the surface have different impacts on the interfacial level alignment and the work function. American Chemical Society 2015-11-09 2015-12-03 /pmc/articles/PMC4671103/ /pubmed/26692915 http://dx.doi.org/10.1021/acs.jpcc.5b08827 Text en Copyright © 2015 American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. |
spellingShingle | Edlbauer, Hermann Zojer, Egbert Hofmann, Oliver T. Postadsorption Work Function Tuning via Hydrogen Pressure Control |
title | Postadsorption Work Function Tuning via Hydrogen Pressure
Control |
title_full | Postadsorption Work Function Tuning via Hydrogen Pressure
Control |
title_fullStr | Postadsorption Work Function Tuning via Hydrogen Pressure
Control |
title_full_unstemmed | Postadsorption Work Function Tuning via Hydrogen Pressure
Control |
title_short | Postadsorption Work Function Tuning via Hydrogen Pressure
Control |
title_sort | postadsorption work function tuning via hydrogen pressure
control |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4671103/ https://www.ncbi.nlm.nih.gov/pubmed/26692915 http://dx.doi.org/10.1021/acs.jpcc.5b08827 |
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