PACS: 79.60.Jv

Polymeric compositions having near IR photoconduction
N.A. Davidenko1, N.G. Kuvshinsky1, D.A. Melenevsky1, N.A. Derevyanko2, A.A. Ishchenko2, A.V. Kulinich2, O. Neilands3, M. Plotniece3

1Taras Shevchenko Kiev National University, Kyiv, Ukraine
2Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Kyiv, Ukraine
3Riga Technical University, Riga, Latvia

Abstract. Peculiar properties of carrier photogeneration in the polymer compositions based on polystyrene containing substituted tetrathiafulvalenes – electron donors, 2,4,5,7-tetranitro-9-fluorenone – acceptor of electrons, cationic polymethine dye – tetrafluoroborate 1,3,3-trimethy 1-2-[3-(1,3-dihydro-1,3,3-trimethyl-2I-2-indolyliden)-1-propenyl]-3I-indolium and neutral merocyanine - 5-[6-(1,3-dihydro[1,3,3-trimethyl-2I-indol-2-yliden)-4-phenyl-3,5-(ethylene)-hexa-2,4,6-trien-1-yl] thiobarbituric acid – sensitizers. The photoconductivity in the dye absorption range increases, when the cation dye changed to the neutral, mostly due to mobile carrier with both charges sign photogeneration, and the activation energy of the photoconductivity current decrease. The decrease of photoconduction current activation energy can be related to the organic charged counterion generation in the neutral dye case, and the uncoloured counterion retains more strongly the opposite charge on the photogenerated organic ion in the cation dye case.
Keywords: polymeric compositions, tetrathiafulvalenes, organic dyes, carrier photogeneration, electron-hole pairs.
Paper received 15.12.03; accepted for publication 17.06.04.

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