Molecular ion formation by photoinduced electron transfer at the tetracyanoquinodimethane/Au(111) interface
Optically induced processes in organic materials are essential for light harvesting, switching, and sensor technologies. Here we studied the electronic properties of the tetracyanoquinodimethane(TCNQ)/Au(111) interface by using two-photon photoemission spectroscopy. For this interface we demonstrate...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
September 12, 2017
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| In: |
The journal of physical chemistry letters
Year: 2017, Jahrgang: 8, Heft: 19, Pages: 4685-4690 |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.7b01897 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1021/acs.jpclett.7b01897 Verlag, Volltext: https://doi.org/10.1021/acs.jpclett.7b01897 
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| Verfasserangaben: | David Gerbert and Petra Tegeder |
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| 520 | |a Optically induced processes in organic materials are essential for light harvesting, switching, and sensor technologies. Here we studied the electronic properties of the tetracyanoquinodimethane(TCNQ)/Au(111) interface by using two-photon photoemission spectroscopy. For this interface we demonstrated the lack of charge-transfer interactions, but we found a significant increase in the sample work function due to UV-light illumination, while the electronic structure of the TCNQ-derived states remain unaffected. Thereby the work function of the interface can be tuned over a wide range via the photon dose. We assigned this to a photoinduced metal-to-molecule electron transfer creating negative ions. The electrons are bound by a small potential barrier. Thus thermal activation reverses the process resulting in the original work function value. The presented photoinduced charge transfer at the TCNQ/Au(111) interface can be used for continuous work function tuning across the substrate’s work function, which can be applied in device-adapted hole-injection layers or organic UV-light sensors. | ||
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