Excitonic diffusion in thin molecular films |
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Authors: | Vjekoslav Sajfert Jovan Šetrajčić Bratislav Tošić Rajka Djajić |
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Institution: | (1) Technical Faculty “M. Pupin” Zrenjanin, University of Novi Sad, Djure Djakovica str. bb, 23000 Zrenjanin, Serbia and Montenegro;(2) Department of Physics, Faculty of Sciences, University of Novi Sad, Novi Sad, Serbia and Montenegro;(3) Research Center “Dr. Branislav Lalović”, Holtech Holding, Novi Sad, Serbia and Montenegro |
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Abstract: | The analyses of exciton diffusion in thin molecular films have shown that the diagonal elements of the diffusion tensor, usually
called diffusion coefficients, depend on the layer index labeling layers in the direction of disturbed symmetry. The particular
analysis was done for a thin film having four layers. In this structure only two layers are occupied by optical excitations.
It means that in the four layer film two films occur in which optical excitations can travel. The subfilm contains a boundary
layer that noticeably differs from the subfilm with internal layers. If the subfilm contains the boundary layer, the diffusion
coefficient of this layer differs from the diffusion coefficient of any internal layer. If the subfilm contains two internal
layers, the diffusion coefficient of these layers are equal, expectably from the viewpoint of physics. The exciton diffusion
is very low due to the high exciton energies.
This work was supported by the Serbian Ministry of Science and Technology: Grant No 1895. |
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Keywords: | PACS" target="_blank">PACS 68 60 -p 71 35 -y 78 20 -e |
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