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Temperature Dependence of Properties of Heterojunctions of Some TCNQ Salts in Polymer Matrices with p- or n-Doped Silicon

100%
Jeszka J. K., Tracz A., Boiteux G., Seytre G., Kryszewski M.
Acta Physica Polonica A
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1995
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vol. 88
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issue 3
533-541
EN
The temperature dependence of the electrical properties of heterojunctions with silicon formed by conductive organic polymer composites with networks of two complex tetracyanoquinodimethane salts (of N-n-butyl-isoquinolinium and of diethyl methyl sulphonium cations) were studied. We show that it is possible to prepare junctions with quite good rectifying properties, comparable to those obtained using other organic semiconductors. The observed forward-bias current-voltage characteristics can be satisfactorily fitted using the modified Schottky equation. Reverse bias and C-V characteristics show that the transport mechanism, especially in the case of p-Si junctions is more complicated and probably tunnelling between localized levels plays an important role.
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Segregated network polymer/carbon nanotubes composites

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Mierczynska A., Friedrich J., Maneck H., Boiteux G., Jeszka J.
Open Chemistry
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2004
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vol. 2
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issue 2
363-370
EN
In this work we present the preparation of conductive polyethylene/carbon nanotube composites based on the segregated network concept. Attention has been focused on the effect of decreasing the amount of filler necessary to achieve low resistivity. Using high- and low-grade single-walled carbon nanotube materials we obtained conductive composites with a low percolation threshold of 0.5 wt.% for high-grade nanotubes, about 1 wt% for commercial nanotubes and 1.5 wt% for low-grade material. The higher percolation threshold for low-grade material is related to low effectiveness of other carbon fractions in the network formation. The electrical conductivity was measured as a function of the single-walled carbon nanotubes content in the polymer matrix and as a function of temperature. It was also found that processing parameters significantly influenced the electrical conductivity of the composites. Raman spectroscopy was applied to study single wall nanotubes in the conductive composites.
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