Optical and photovoltaic properties of polymer composites with high (up to 40 %) concentration of Cl-containing polymethine dye (meso-Cl) and their heterostructures with V₂O₅ xerogel films consisting of nanofibres have been studied. As polymer matrix different carbazole polymers: polyvinylcarbazole (PVK), polyepoxypropylcarbazole (PEPK), octylmetacrylate-vinylcarbazole (VK-OMA), 3-Iodine-octylmetacrylate-vinylcarbazole (3I-VK-OMA) were used. Meso-Cl / polymer films were prepared by spin-coating method from dichloroethane solution. V₂O₅ xerogel films were made by sol-gel method.
It is shown that few types of aggregates are formed in meso-Cl / polymer films. This leads to the significant widening of absorbance spectral region in short wavelength side (to 500 nm) comparing of molecular absorbance in the solutions. The efficiency of charge carriers photogeneration for aggregates is greater than for single dye molecules. Because of this meso-Cl - polymer composites are photosensitive at 500-950 nm range.
It is found that the increase of photosensitivity is observed for double-layer heterostructures with V₂O₅ especially in the region of xerogel absorption due to charge carriers photogeneration in V₂O₅ layer.
The structures of 3I-VK-OMA have maximal photosensitivity among studied polymer matrixes.
The effect of molecular structure of polymers, dye aggregation and V₂O₅ xerogel films quenching on photovoltaic properties of components and structures is discussed.
Photosensitivity observed for above structures is sufficiently greater than that of NBDB/C60 heterostructures, and the spectral region of their sensitivity is wider than of HITC dye based polymer structures.
Therefore studied double-layer structure can be used for the development of plastic photoconverters sensitive in near-IR region, including organic solar cells.
This work is supported by INTAS grant 00-00506.

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