Photoconductive organic materials for the near-IR radiation range |
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Authors: | N A Davidenko N A Derevyanko A A Ishchenko N G Kuvshinsky A V Kulinich O Ya Neiland M V Plotniece |
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Institution: | (1) Taras Shevchenko Kiev National University, 64 ul. Vladimirskaya, 01033 Kiev, Ukraine;(2) Institute of Organic Chemistry National Academy of Sciences of Ukraine, 5 ul. Murmanskaya, 02094 Kiev, Ukraine;(3) Riga Technical University, 14 ul. Azenes, LV-1048 Riga, Latvia |
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Abstract: | Polymer composition films based on polystyrene and containing electron donors, viz., substituted tetrathiafulvalenes, an electron acceptor, viz., 2,4,5,7-tetranitrofluoren-9-one, and sensitizers, viz., a cationic polymethine dye, 1,3,3-trimethyl-2-3-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)prop-1-en-1-yl]-3H-indolium tetrafluoroborate, and a neutral merocyanine dye, 5-{3-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene]-2-phenyl-cyclopent-1-en-1-ylmethylene}-2-thioxodihydropyrimidine-4,6(1H,5H)-dione, were prepared. The internal photo effect upon film irradiation in the near-IR range is provided by low ionization potentials of the donors and the high electron affinity of the acceptor. The photoconductivity increases upon replacement of a cationic dye by a neutral one, mainly because of photogeneration of mobile charge carriers of both signs and a decrease in the activation energy for the photoconduction current. The decrease in the activation energy for the photocurrent is due to the fact that in the case of a neutral dye, the mobile charge carriers move away from each other during their separation, while in the case of a cationic dye, the colorless counterion strongly holds the photo generated charge carrier.Published in Russian in Izvestiya Akademii Nauk.
Seriya Khimicheskaya, No. 8, pp. 1611–1617, August, 2004. |
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Keywords: | electron— hole pairs organic dyes photogeneration of charge carriers polymer compositions tetrathiafulvalenes |
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