Charge transport of the mesoscopic metallic state in partially crystalline polyanilines

Joo, Jinsoo; Long, S.M.; Pouget, Jean‐Paul; Oh, Eun Joo; MacDiarmid, Alan G.; Epstein, Arthur J.

doi:10.1103/physrevb.57.9567

Cited by 254 publications

(156 citation statements)

References 58 publications

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“…18 Further, covalent bonding along polymer chains and weak bonding between them result in a quasi-one-dimensional morphology which has an important role in the charge delocalization of these systems. 19 In a relatively ordered crystalline material, as in the present case, protonation of polyaniline with sulphonic acid results in a decrease in hopping distance and consequently enhances the hopping mechanism (phonon-assisted tunneling between electronic localized states centered at different positions). 20 It is difficult to distinguish between different conduction mechanisms such as quasi-1D variable range hopping mechanism, 21 3D hopping with electron-electron interaction, 22 tunneling between mesoscopic metallic islands 23 or correlated hopping between polaronic clusters in polyaniline.…”

Section: Resultsmentioning

confidence: 99%

Thermal characterization of doped polyaniline and its composites with CoPc

et al. 2004

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Thermal diffusivity of the composites of camphor sulphonic acid (CSA) doped polyaniline (PANI) and its composites with cobalt phthalocyanine (CoPc) has been measured using open cell photoacoustic technique. Analysis of the data shows that the effective thermal diffusivity value can be tuned by varying the relative volume fraction of the constituents. It is seen that polaron assisted heat transfer mechanism is dominant in CSA doped PANI and these composites exhibit a thermal diffusivity value which is intermediate to that of CSA doped PANI and CoPc. The results obtained are correlated with the electrical conductivity and hardness measurements carried out on the samples.

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Section: Resultsmentioning

confidence: 99%

Thermal characterization of doped polyaniline and its composites with CoPc

et al. 2004

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“…It is well established that the metallic state in conducting polymers requires careful preparation in order to minimize structural disorder. Diffraction experiments show that in the best metallic polymers the crystalline coherence length ξ is at most several nanometers [2,3,23]. Metallic islands could be formed when the crystalline coherence length is larger than the extent of electronic wavefunctions.…”

Section: Fig 4 Schematic Drawing Of the Density Of States (Dos)mentioning

confidence: 99%

“…In this case, the MIT corresponds to a percolation transition of metallic islands embedded in an amorphous matrix. [2][3][4] Other studies suggest that the MIT is of the Anderson type [1] with disorder occurring on length-scales equal or less than the electronic correlation-length. [5,6] Then, extended and localized states are separated in energy by the mobility edge (E c ), and the MIT occurs when E F crosses E c .…”

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confidence: 99%

Metallic state in disordered quasi-one-dimensional conductors

et al. 2001

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The unusual metallic state in conjugated polymers and single-walled carbon nanotubes is studied by dielectric spectroscopy (8-600 GHz). We have found an intriguing correlation between scattering time and plasma frequency. This relation excludes percolation models of the metallic state. Instead, the carrier dynamics can be understood in terms of the low density of delocalized states around the Fermi level, which arises from the competion between disorder-induced localization and interchaininteractions-induced delocalization.The finite conductivity of a metal at zero Kelvin is a consequence of the lattice-periodicity and the finite density of states at the Fermi level (E F ). By breaking translational symmetry, disorder localizes chargecarriers. Upon growing disorder, eventually a metalinsulator transition (MIT) occurs [1], the effect being the stronger the lower the dimensionality. In one dimension (1D) any disorder localizes the electronic states. The MIT in quasi-1D conducting polymers and single-walled carbon nanotubes is also disorder-driven, but its exact nature is under severe debate. Many authors claim the presence of a "heterogeneous" state in which the relevant disorder length-scale is large compared to the electronic correlation-length. In this case, the MIT corresponds to a percolation transition of metallic islands embedded in an amorphous matrix. [2][3][4] Other studies suggest that the MIT is of the Anderson type [1] with disorder occurring on length-scales equal or less than the electronic correlation-length. [5,6] Then, extended and localized states are separated in energy by the mobility edge (E c ), and the MIT occurs when E F crosses E c .

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“…13 Heavily doped CPs are conductors with the finite densities of states at the Fermi level. 12,[14][15][16] The conductivities for doped CPs range from 10 −2 S/cm-10 5 S / cm. 12 However, the charge transport of this class of organic conductor behaves like neither conventional metals nor semiconductors due to their morphological structure.…”

Section: Introductionmentioning

confidence: 99%

Electric-field-controlled conductance of “metallic” polymers in a transistor structure

2006

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It was recently reported that use of a doped "metallic" polymer as the active channel in a field effect transistor structure results in unexpected "normally on" transistorlike behavior. We report here the role of ion migration in transistors based on metallic polymer ͓poly͑3,4-ethylenedioxythiophene͒ doped with poly͑styrene sulfonic acid͒ ͑PEDOT:PSS͔͒. The analysis of the ion flow into the active channel due to the gate voltage suggests that for the transistors studied compensating ϳ2 counterions per 100 dopant molecules suppresses PEDOT conductance up to three orders of magnitude. We determine from the temperature dependence of the conductivity of the active channel that the change in conductance of the active channel is throughout the channel in contrast to confinement of gate field induced charge carriers to the channel/dielectric interface in conventional transistors. The decrease of channel conductance reflects an increase of activation energy of carriers. Therefore, we propose that removal of intermediate hopping sites in the disoriented PEDOT:PSS by a small fraction of ion charge compensation causes carriers to anisotropically hop over longer distance leading to a conductor-nonconductor transition.

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Charge transport of the mesoscopic metallic state in partially crystalline polyanilines

Cited by 254 publications

References 58 publications

Thermal characterization of doped polyaniline and its composites with CoPc

Thermal characterization of doped polyaniline and its composites with CoPc

Metallic state in disordered quasi-one-dimensional conductors

Electric-field-controlled conductance of “metallic” polymers in a transistor structure

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