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

Recherche transversale
(titres de publication, de périodique et noms de colloque inclus)
2009-11-22 - Article/Dans un journal avec peer-review - Anglais - 10 page(s)

Jakobsson F.L.E., Marsal Philippe, Braun S., Falhman M., Berggren M., Cornil Jérôme , Crispin X., "Tuning the Energy Levels of Photochromic Diarylethene Compounds for Opto-Electronic Switch Devices" in Journal of Physical Chemistry C: Nanomaterials, Interfaces, and Hard Matter, 113, 42, 18396-18405

  • Edition : American Chemical Society, Washington (DC)
  • Codes CREF : 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) Diarylethene molecules are photochromics (PCs) currently investigated for use in optical write/electrical read memory applications. The impact of the photoisomerization of PCs on the device behavior is analyzed with charge transport models. These results indicate that good electrical current switching can be achieved in a device when the PCs are combined with an organic semiconductor (in multilayered structures or blends). The frontier energy levels and dipole moment of a series of diarylethene compounds have been calculated using density functional theory. A good agreement is found between the calculated electronic structure and the measured ultraviolet photoelectron spectra. Shifts in the frontier energy levels and dipole moment are generated through two different approaches for chemical modification: (i) by changing the chemical nature of the aryl rings or (ii) by adding substituents on the ethylene bridge. The frontier energy levels can be tuned by more than 2 eV via such chemical modifications. We find that, for this family of photochromic compounds, the photoinduced current switch effect in diodes is mainly due to the modulation in the frontier energy levels rather than the changes in the amplitude of the dipole moment.

Notes :
  • (Anglais) Publié en ligne le 28 septembre 2009
Identifiants :
  • DOI : 10.1021/jp9043573