Electron transport of holes in molecularly doped polycarbonate and its radiation-induced conductivity |
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Authors: | A P Tyutnev V S Saenko A V Vannikov Yu F Kundina E D Pozhidaev |
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Institution: | (1) Moscow State Institute of Electronics and Mathematics, Trekhsvyatitel’skii per. 3/12, 109028 Moscow, Russia;(2) Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskiipr. 31, 117071 Moscow, Russia |
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Abstract: | The salient features of charge transport in a typical molecularly doped polymer (polycarbonate + 30 wt % DEH hydrazone) were
studied by time-of-flight and nonsteady-state radiation-induced conductivity measurements. It was shows that the mobility
of holes (major carriers) is due to dispersive transport in the temperature range 296–353 K covering the glass transition
temperature at an observation time of up to a few seconds. The appearance of a plateau on the current transient, presumably
manifesting the establishing of quasiequilibrium (Gaussian) transport, is the artifact of the time-of-flight technique when
the charge carrier generation takes place at the sample surface. All of the obtained results can be satisfactorily rationalized
in terms of the Rose-Fowler-Weisberg model with a uniform set of parameters of the model. Such an approach is compatible with
the basic concepts of the radiation chemistry of condensed phase (the Onsager theory and the Langevin recombination mechanism),
structural features of a disordered medium (transport zone, structural traps), and rotational diffusion of small molecules
or their molecular groups in vitrified polymers. |
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