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Charge transfer characteristics of F 6 TCNNQ–gold interface
Author(s) -
Kuhrt Robert,
Hantusch Martin,
Knupfer Martin,
Büchner Bernd
Publication year - 2020
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6794
Subject(s) - homo/lumo , x ray photoelectron spectroscopy , valence (chemistry) , molecule , fermi level , chemistry , heterojunction , metal , crystallite , spectral line , electron transfer , charge (physics) , molecular orbital , atomic physics , analytical chemistry (journal) , chemical physics , materials science , electron , crystallography , photochemistry , nuclear magnetic resonance , physics , chromatography , optoelectronics , organic chemistry , quantum mechanics , astronomy
The metal–organic interface between polycrystalline gold and hexafluorotetracyanonaphthoquinodimethane (F 6 TCNNQ) was investigated by photoelectron spectroscopy with the focus on the charge transfer characteristics from the metal to the molecule. The valence levels, as well as the core levels of the heterojunction, indicate a full electron transfer and a change in the chemical environment. The changes are observed in the first F 6 TCNNQ layers, whereas for further film growth, only neutral F 6 TCNNQ molecules could be detected. New occupied states below the Fermi level were observed in the valence levels, indicating a lowest unoccupied molecular orbital (LUMO) occupation due to the charge transfer. A fitting of the spectra reveals the presence of a neutral and a charged F 6 TCNNQ molecules, but no further species were present.