Electrical Conductivity in Doped Polyacetylene

Chiang, C. K.; Fincher, C. R.; Park, Y. W.; Heeger, Alan J.; Shirakawa, Hideki; Louis, E. J.; Gau, S. C.; MacDiarmid, Alan G.

doi:10.1103/physrevlett.39.1098

Cited by 3,150 publications

(1,428 citation statements)

References 16 publications

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“…[1][2][3] Both experiments and simulations have shown that reducing conformational disorder of the subunits enhances conjugation and energy transport. 4,5 Furthermore, defect states formed in the π-π* bandgap by por n-type doping facilitate conductivity through the π-conjugated backbone.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Dynamics of Polarons in Conductive Polyaniline: Comparison of Primary and Secondary Doped Forms

2008

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Time-and wavelength-resolved pump-probe measurements are performed on the conductive, primary and secondary doped, forms of polyaniline in solution to investigate the relaxation dynamics of photoexcited polarons. Contrasting dynamics observed in the two forms allow investigation of electronic (and structural) relaxation of this material. Pump pulse at 800 nm photoexcites an electron from the valence to polaron band, and subsequent relaxation dynamics are probed by a white light continuum pulse. Three distinct features are observed in the primary doped sample: (1) absorption near time zero in the 900-1025 nm probe wavelength region; (2) delayed absorption from 850 to 1025 nm; (3) pronounced oscillations with frequencies of 165 and 210 cm -1 . The first two features are associated with intraband absorptions to higher-lying states in the polaron band from the initial excited and conformationally changed intermediate states. The oscillations reflect torsional motions associated with photoexcitation and relaxation. In the secondary doped material, only bleaching and stimulated emission are observed throughout the whole spectral region; neither transient absorption signals nor oscillatory dynamics are observed. Kinetic modeling is performed to establish the mechanism of relaxation. We propose that the excited polaron relaxes nonradiatively to the ground state through an intermediate state(s) with a twisted geometry. Our measurements and analysis allow us to describe the structure of the polaron bands for primary and secondary doped polyaniline; they are in the small and large polaron limits, respectively, and are consistent with a bandgap for the primary doped form and without a bandgap (i.e., metallic) for the secondary doped material.

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Section: Introductionmentioning

confidence: 99%

Ultrafast Dynamics of Polarons in Conductive Polyaniline: Comparison of Primary and Secondary Doped Forms

2008

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“…This concept was recently demonstrated in an organic electronic "ion pump" 18 . When addressing the device with a driving voltage, K + was electrophoretically transported from a source electrolyte, through a film of the conducting polymer 19 poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT:PSS) [20][21][22] , into a target reservoir containing neuronal cells. Local increase of extracellular [K + ] depolarized the cell membrane, thereby activating membrane-bound Ca 2+ pumps, i.e., the electronic input signals were translated into ion fluxes and, in turn, activation of intracellular signal transduction pathways.…”

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Organic electronics for precise delivery of neurotransmitters to modulate mammalian sensory function

et al. 2009

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“…107,108 4. Polymers: from band-like to incoherent hopping charge transport Ever since the discovery of electrically conductive polymers by MacDiarmid, Shirakawa and Heeger et al, 109,110 these materials have enjoyed growing attention of researchers. Studying charge transport in polymers is interesting both from the fundamental and the practical viewpoints.…”

Section: This Journal Is C the Owner Societies 2010mentioning

confidence: 99%

Single molecule charge transport: from a quantum mechanical to a classical description

Kocherzhenko

Grozema

Siebbeles

2011

Phys. Chem. Chem. Phys.

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This paper explores charge transport at the single molecule level. The conductive properties of both small organic molecules and conjugated polymers (molecular wires) are considered. In particular, the reasons for the transition from fully coherent to incoherent charge transport and the approaches that can be taken to describe this transition are addressed in some detail. The effects of molecular orbital symmetry, quantum interference, static disorder and molecular vibrations on charge transport are discussed. All of these effects must be taken into account (and may be used in a functional way) in the design of molecular electronic devices. An overview of the theoretical models employed when studying charge transport in small organic molecules and molecular wires is presented.

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Electrical Conductivity in Doped Polyacetylene

Cited by 3,150 publications

References 16 publications

Ultrafast Dynamics of Polarons in Conductive Polyaniline: Comparison of Primary and Secondary Doped Forms

Ultrafast Dynamics of Polarons in Conductive Polyaniline: Comparison of Primary and Secondary Doped Forms

Organic electronics for precise delivery of neurotransmitters to modulate mammalian sensory function

Single molecule charge transport: from a quantum mechanical to a classical description

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