The paper presents review of experimental results on the charge transport study in the polymer materials, possessed charge instability [1]. The base of these materials is noncojugated polyaromatic compounds [2]. Characteristic feature these materials is a wide of band gap up  to 4.3 eV and the value of first ionization potential about 6 eV. Electronic energetic parameters like these are typical for insulator materials. However it was established that there are not only hopping mechanism of charge transport possible but coherent too in such organic systems. Wide band gap organic material capable to transport charge carrier effectively under certain conditions and the same time conductivity can reach 10⁵  (Ohm·cm)^-1value  and current density up to 10⁶ A/cm² and more. Transformation to conducting phase may occur with different fields and influences, such as electric field, magnet field, pressure, temperature and others. These transformations are reversible as a rule.

The common point of view on high conductivity mechanism in wide band polymer is absent now.

It is possible to create metal like conductivity in organic material during the polymer film formation. This phenomenon was used for preparing full organic transparent conductive adhesive (OTCA).  All components of the OTCA are soluble organic compounds. High level conductivity is a result of insulator to metal transition, which occur during curing procedure. Conductivity reach up to 10⁵ (Ohm cm)^-1 and transparency to 95% after the curing. The OTCA has a high anisotropy of conductivity. The paper discusses different areas of application for new flexible, transparent conducting polymer materials.  

References

1. A N Lachinov, N V Vorob'eva, Physics – Uspekhi, 49,  1223 (2006).
2. S. N. Salazkin , V. V. Shaposhnikova, L. N. Machulenko, N. G. Gileva, V. A. Kraikin, and A. N. Lachinov. Polymer Science, A, 50, 243 (2008).

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