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Studies of Polymer-dye Structures and Polymer-dye / V2O5 xerogel Heterostructures Photosensitive in Wide Spectral Region

Yaroslaw I. Vertsimakha 1Anatoly B. Verbitsky 1Alexander S. Kutsenko 2Alexander A. Ishchenko 3Natalia A. Berezina 4Vladimir G. Syromyatnikov 4

1. Institute of Physics NASU (IP), Prospect Nauki 46, Kyiv 03028, Ukraine
2. Institute of Physical Chemistry (IPC), Prosp.Nauki 31, Kyiv 03039, Ukraine
3. Institute of Organic Chemistry NASU (IOC), Murmanskaya Str., Kyiv 02094, Ukraine
4. Kyiv National Taras Shevchenko University, Department of Chemistry, Volodymirskaya Str. 64, Kyiv 01033, Ukraine

Abstract

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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Related papers

Presentation: poster at E-MRS Fall Meeting 2003, Symposium F, by Yaroslaw I. Vertsimakha
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-07 17:30
Revised:   2009-06-08 12:55