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  Formation of an intermolecular charge-transfer compound in UHV codeposited tetramethoxypyrene and tetracyanoquinodimethane

Medjanik, K., Perkert, S., Naghavi, S., Rudloff, M., Solovyeva, V., Chercka, D., et al. (2010). Formation of an intermolecular charge-transfer compound in UHV codeposited tetramethoxypyrene and tetracyanoquinodimethane. Physical Review B, 82(24): 245419, pp. 1-9. doi:10.1103/PhysRevB.82.245419.

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Datensatz-Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-B6A4-B Versions-Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-B6AC-C
Genre: Zeitschriftenartikel

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 Urheber:
Medjanik, K.1, Autor
Perkert, S.1, Autor
Naghavi, S.1, Autor
Rudloff, M.1, Autor
Solovyeva, V.1, Autor
Chercka, D.1, Autor
Huth, M.1, Autor
Nepijko, S. A.1, Autor
Methfessel, T.1, Autor
Felser, C.2, Autor              
Baumgarten, M.1, Autor
Müllen, K.1, Autor
Elmers, H. J.1, Autor
Schönhense, G.1, Autor
Affiliations:
1external, escidoc:persistent22              
2External Organizations, escidoc:persistent22              

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 Zusammenfassung: Ultrahigh vacuum (UHV)-deposited films of the mixed phase of tetramethoxypyrene and tetracyanoquinodimethane (TMP(1)-TCNQ(1)) on gold have been studied using ultraviolet photoelectron spectroscopy (UPS), x-ray diffraction (XRD), infrared (IR) spectroscopy, and scanning tunneling spectroscopy (STS). The formation of an intermolecular charge-transfer (CT) compound is evident from the appearance of new reflexes in XRD (d(1)=0.894 nm and d(2)=0.677 nm). A softening of the CN stretching vibration (redshift by 7 cm(-1)) of TCNQ is visible in the IR spectra, being indicative of a CT on the order of 0.3e from TMP to TCNQ in the complex. Characteristic shifts in the electronic level positions occur in UPS and STS that are in reasonable agreement with the prediction of density-functional theory (DFT) calculations (GAUSSIAN03 with hybrid functional B3LYP). STS reveals a highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gap of the CT complex of about 1.25 eV being much smaller than the gaps (>3.0 eV) of the pure moieties. The electron-injection and hole-injection barriers are 0.3 eV and 0.5 eV, respectively. Systematic differences in the positions of the HOMOs determined by UPS and STS are discussed in terms of the different information content of the two methods.

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 Datum: 2010-12-13
 Publikationsstatus: Im Druck publiziert
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000286896100007
DOI: 10.1103/PhysRevB.82.245419
 Art des Abschluß: -

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Titel: Physical Review B
  Andere : Phys. Rev. B
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Woodbury, NY : American Physical Society
Seiten: - Band / Heft: 82 (24) Artikelnummer: 245419 Start- / Endseite: 1 - 9 Identifikator: ISSN: 1098-0121
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954925225008