[en] 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.
Disciplines :
Chemistry Physics
Author, co-author :
Jakobsson, F.L.E.
Marsal, Philippe
Braun, S.
Falhman, M.
Berggren, M.
Cornil, Jérôme ; Université de Mons > Faculté des Sciences > Chimie des matériaux nouveaux
Crispin, X.
Language :
English
Title :
Tuning the Energy Levels of Photochromic Diarylethene Compounds for Opto-Electronic Switch Devices
Publication date :
22 November 2009
Journal title :
Journal of Physical Chemistry. C, Nanomaterials and interfaces
ISSN :
1932-7447
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
113
Issue :
42
Pages :
18396-18405
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
S817 - Chimie des matériaux nouveaux
Research institute :
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
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