Hopping transport in doped conducting polymers in the insulating regime near the metal-insulator boundary: polypyrrole, polyaniline and polyalkylthiophenes
| Autor: | M. Reghu, Alan J. Heeger, C.O. Yoon, Daniel Moses, Tian-An Chen, Yong Cao, X. Wu, Reuben D. Rieke |
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| Rok vydání: | 1995 |
| Předmět: |
Conductive polymer
Materials science Condensed matter physics Mechanical Engineering Doping Metals and Alloys Condensed Matter Physics Polypyrrole Thermal conduction Electronic Optical and Magnetic Materials Metal chemistry.chemical_compound chemistry Mechanics of Materials Electrical resistivity and conductivity visual_art Polyaniline Materials Chemistry visual_art.visual_art_medium Organic chemistry Metal–insulator transition |
| Zdroj: | Synthetic Metals. 75:229-239 |
| ISSN: | 0379-6779 |
| DOI: | 10.1016/0379-6779(96)80013-0 |
| Popis: | Transport data for polypyrrole-hexafluorophosphate (PPy-PF6), protonated polyaniline and iodine-doped regio-regular polyalkylthiophenes (PATs), all in the insulating regime near the disorder-induced metal-insulator (M-I) boundary, are presented and analyzed. These doped conducting polymers have the transport properties of a Fermi glass insulator; the disorder being characterized by the resistivity ratio, ρr ρ(1.4 K)/ρ(300 K). In the regime close to the M-I transition (ρr 103), ρ(T) shows two distinctly different behaviors. In homogeneous material, Mott's VRH conduction is recovered. In inhomogeneous samples, where ‘metallic island’ are formed after partial dedoping or by strong morphological disorder, ln ρ ∝ (T 0 ′/T) 1 2 , characteristic of a granular system. |
| Databáze: | OpenAIRE |
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