DI-UMONS : Dépôt institutionnel de l’université de Mons

Recherche transversale
(titres de publication, de périodique et noms de colloque inclus)
2009-02-24 - Article/Dans un journal avec peer-review - Anglais - 10 page(s)

Avilov I.V., Geskin V.M., Cornil Jérôme , "A Quantum-Chemical Characterization of the Origin of Dipole Formation at Molecular Organic/Organic Interfaces" in Advanced Functional Materials, 19, 4, 624-633

  • Edition : Wiley-VCH Verlag, Weinheim (Germany)
  • Codes CREF : Chimie des surfaces et des interfaces (DI1327), Physique de l'état solide (DI1261), Chimie quantique (DI1321)
  • Unités de recherche UMONS : Chimie des matériaux nouveaux (S817)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) Recent experiments have reported a vacuum level shift at the interface between organic materials due to the formation of an interface dipole layer. On the basis of quantum-chemical calculations, this paper sheds light on the factors contributing to the formation of an interface dipole between an electron donor and an electron acceptor, considering as model system a complex made of tetrathiafulvalene (TTF) as a donor and tetracyanoquinodimethane (TCNQ) as an acceptor. The results indicate that the interface dipole is governed both by charge-transfer and polarization effects and allow for disentangling of their respective contributions. Two regimes of charge transfer can be distinguished depending on the strength of the electronic coupling: a fractional charge transfer occurs in the strong coupling regime while only integer charges are transferred when the coupling is weak. The polarization contribution can be significant, even in the presence of a pronounced charge transfer between the donor and acceptor molecules. The values of ionization potential and electron affinity of the donor and acceptor molecules may experience shifts as large as several tenths of an eV at the interface with respect to the isolated compounds.

Notes :
  • (Anglais) Lecture en ligne: http://onlinelibrary.wiley.com/doi/10.1002/adfm.200800632/pdf
  • (Anglais) Publié en ligne le 12 janvier 2009
Identifiants :
  • DOI : 10.1002/adfm.200800632