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Photoelectrical Behaviour of DNA:PEDT-PSS Functionalised Films

100%
Kažukauskas V., Pranaitis M., Krupka O., Sahraoui B.
Acta Physica Polonica A
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2011
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vol. 119
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issue 2
151-153
EN
We report investigations of functionalized DNA:PEDT-PSS films. The thermal activation energy of the conductivity near the room temperature was about 0.033 eV. The weak carrier trapping was identified by the thermally stimulated current method, proving the fast recombination of light-generated carriers. A "bistable" photoconductivity below the room temperature was evidenced upon the white light excitation. By cooling the samples down to 145-155 K the photoconduction was small. Below this temperature sudden increase of the photoconductivity was observed. Meanwhile by heating the photosensitivity remained enhanced up to 235-245 K. The slow relaxations of the current after the light excitation took place, the time constant of which reached several hundreds of seconds. Such phenomenon could presumably be attributed to the light-induced changes of the sample material morphology and/or associated variation of carrier transport conditions.
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Charge Carrier Transport in Non-Homogeneous MDMO-PPV Polymer

100%
Kažukauskas V., Pranaitis M., Janonis V.
Acta Physica Polonica A
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2011
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vol. 119
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issue 2
128-130
EN
By thermally stimulated currents we have investigated carrier transport and trapping in [poly-(2-methoxyl, 5-(3,77dimethyloctyloxy)] paraphenylenevinylene (MDMO-PPV). To assure selective excitation of the defect states the spectral width of the exciting light was varied from 1.77 eV up to 3.1 eV. The thermally stimulated current curves were shown to be a superposition of carrier generation from trapping states and thermally stimulated mobility growth. The extrinsic excitation resulted in 0.16 eV photoconductivity effective activation energy values, which decreased down to 0.05 eV for the intrinsic excitation. The deeper states with activation energies of 0.28-0.3 eV and 0.8-0.85 eV were identified, too. The results are direct indication of distributed in energy trapping and transport states with the standard deviation of the density of states of about 0.015 eV.
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Effect of Molecular Orientation on Photovoltaic Efficiency and Carrier Transport in a New Semiconducting Polymer

64%
Kažukauskas V., Pranaitis M., Sentein C., Rocha L., Raimond P., Duyssens I., Van Severen I., Lutsen L., Cleij T., Vanderzande D.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
1009-1012
EN
New functionalized soluble poly(p-phenylene vinylene) derivative bearing polar molecules was designed and synthesized in order to investigate effects of molecular orientation in polymer photovoltaic devices. The active polar molecule is the 4-(N-butyl-N-2-hydroxyethyl)-1- nitro-benzene group. The grafting of the push-pull molecule with a donor/transmitter/acceptor structure, possessing a large ground state dipole moment, enables the molecular orientation by a dc electric field. An internal electric field stored in such system facilitates exciton dissociation and improves charge transport in single-layer devices. In our systems an increase in the external quantum efficiency by a factor of about 1.5 to 2 is estimated. The associated effects of orientation on the carrier injection and transport properties were evidenced.
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