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Organic thin films based on a dicyanovinyl-quaterthiophene: Influence of electrode configuration on third-order nonlinear optical properties measured by electroabsorption spectroscopy |
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| Authors: | Christine Videlot-Ackermann Takashi Isoshima Abderrahim Yassar Hiroyuki Sasabe |
| Affiliation: | a Laboratoire des Matériaux Moléculaires et des Biomatériaux, GC0M2 UMR CNRS 6114, Faculté des Sciences de Luminy, Case 901, 163, avenue de Luminy, F-13288 Marseille Cedex 09, France b Local Spatio-Temporal Functions Lab., Frontier Research System, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan c ITODYS, Université Paris 7-Denis Diderot, 1 rue Guy de la Brosse, 75005 Paris, France d RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan e Chitose Institute of Science and Technology, 758-65 Bibi, Chitose, Hokkaido 066-8655, Japan f CEA-Saclay, LRC Nanostructures et Semi-Conducteurs Organiques (CEA-CNRS-UPMC), SPCSI/DRECAM, Bât. 462, 91191 Gif-sur-Yvette, France |
| Abstract: | Electroabsorption (EA) studies at room temperature on organic thin films based on a dicyanovinyl-quaterthiophene 4T-V(CN)2 are reported. An electric field modulation is applied to the samples for two different electrode geometries, i.e. sandwich and coplanar versus the organic layer. Changes in optical absorption coefficient of 4T-V(CN)2 based thin films are measured and analyzed to determine the character of the optical transition in the visible range (400-800 nm). Depending on the experimental electrode configuration, magnitude of electroabsorption responses are different, possibly due to different distribution of the externally applied electric field. The results indicate a higher resolution of EA response for the sandwich electrode configuration and confirm the charge transfer exciton character of 4T-V(CN)2 in contrast to the unsubstituted quaterthiophene 4T. Finally, a third-order nonlinear susceptibility χ(3) (−ω; ω, 0, 0) of 16 × 10−12 e.s.u. is obtained. |
| Keywords: | 72.80.Le 33.15.&minus e 78.66.&minus w 42.70.Mp Nq |
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