Intra‐Island Coulomb Correlations in PEDOT:PSS Thin Films; Saturation of Spin Polarization Magnetoresistance

Nikiforov, D. V.; Tessler, Nir; Ehrenfreund, E.

doi:10.1002/aelm.202001033

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…Most of the studies are limited to the charge transport of one-time solvent treated or doped PEDOT:PSS films (table 1). The survey reported in table 1 reveals that the low temperature charge transport behavior of PEDOT:PSS is highly dependent on the nature of the solvent (individual) and the method of formation of PEDOT:PSS film [20][21][22][23][24][25]. A study by Fan et al [26] presented the results on the charge transport of PEDOT:PSS films treated by using multiple solvents (by H 2 SO 4 and NaOH) in the temperature range of 110-220 K. However, the temperature range reported in the mentioned study is not enough to provide a clear understanding about the charge transport behavior of PEDOT:PSS films.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of sequential solvent treatment on the structural and low temperature charge transport of PEDOT:PSS films

Sharma¹,

Bhatia²,

Sameera³

2023

J. Phys.: Condens. Matter

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A detailed study on the low temperature charge transport and magnetoresistance (MR) measurements of spin-coated and solvent treated poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films has been presented. The samples were prepared by sequential treatment of PEDOT:PSS film using dimethyl sulfoxide and sulphuric acid. X-ray diffraction and Raman spectroscopy elucidate the effect of solvent treatment on structural modifications of the film, which correlates to the enhanced conductivity values. The nature of solvent and the sequence of successive treatments using different solvents has been effectively utilized to tune the resistance of the film over a wide range. Further, the low temperature (300-2 K) charge transport study indicates that the resistance of film rises sharply below 50 K which implies the samples lie in the category of disordered materials. A linear fit of ln R vs T-1/4 for all the samples indicates that the temperature dependent resistance of solvent treated PEDOT:PSS films follow 3D variable range hopping model. The observed large positive MR behaviour of the films has been discussed in terms of the wave function shrinkage of the charge carriers. The MR follows ~B2 and ~B1/3 dependence at low and high magnetic field regimes, respectively. The sequential treatment of PEDOT:PSS films shown in the present study is an effective method to enhance the electrical conductivity significantly.

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Section: Introductionmentioning

confidence: 99%

Synergistic effect of sequential solvent treatment on the structural and low temperature charge transport of PEDOT:PSS films

Sharma¹,

Bhatia²,

Sameera³

2023

J. Phys.: Condens. Matter

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“…[32][33][34] Moreover, at even lower temperatures (< 15 K) magnetoresistance mechanisms such as: thermal spin polarization of energy levels modified by intra-site Coulomb correlations, quantum interference in hopping conduction regime, and electron wavefunction shrinkage mechanisms take place. [34] CT arrow from SE to the CTE S in Figure 1b). In essence, CTE is a PP that is created in the singlet spin configuration and the polarons are situated on neighboring different type molecules.…”

Section: General Overviewmentioning

confidence: 99%

“…However, we want to note that when the OS conductivity is enhanced by doping and/or morphology changes, yielding delocalization of the charge carriers, other magnetic field related effects may emerge. For instance, in high‐conductivity grade poly(3,4‐ethylenedioxythiophene) : poly(styrenesulfonate) (PEDOT : PSS) with co‐solvents (e. g. ethylene glycol), the low‐temperature (<150 K) in‐plane magneto‐conductance originates due to weak localization effect that takes place within nanocrystalline PEDOT regions [32–34] . Moreover, at even lower temperatures (<15 K) magnetoresistance mechanisms such as: thermal spin polarization of energy levels modified by intra‐site Coulomb correlations, quantum interference in hopping conduction regime, and electron wavefunction shrinkage mechanisms take place [34] …”

Section: Magnetic Field Effect In Organic Semiconductorsmentioning

confidence: 99%

Magnetic Field Effects of Charge Transfer Excitons in Organic Semiconductor Devices

Nikiforov

Ehrenfreund

2021

Israel Journal of Chemistry

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The topic of this review is the effect of magnetic field on photo‐current (PC) in organic semiconductor devices. Magnetic field modifies the fraction of the singlet/triplet population in the charge transfer excitons (CTE) whose lifetime is spin configuration dependent yielding magneto‐PC (MPC). We review MPC in the framework of the polaron pair model and emphasize the effect of CTE lifetime on MPC. In addition to a detailed calculation of the MPC response we find a range of physical parameters in which the response follows a simple ′fit function′. For example, a sum of wide and narrow Lorentzian functions, MPC(B)=cwB2/(B2+bw2)+cnB2/(B2+bn2), in the case of hyperfine interaction; or a Voigt profile V=L*G, where the sign * stands for the convolution operation between a Lorentzian (L) and a Gaussian (G) functions, in the case of thermal spin polarization. We provide expressions for the fit parameters in terms of physical parameters.

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Magneto‐Capacitance of PEDOT:PSS Thin Films; Effects of a Two‐Phase System and Coulomb Interaction

Nikiforov,

Tessler,

Ehrenfreund

2024

Adv Elect Materials

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The study of the net magneto‐capacitance, C(B), in thin films of the conducting polymer Poly(3 4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is presented. In the films there are charged electrically‐conducting PEDOT‐rich regions surrounded by PSS insulating charged material. The high‐conductivity grade PEDOT:PSS thin films are studied at low temperature, where the hopping conduction is dominant. It is experimentally observed that there is a finite net magneto‐capacitance, C(B), in the temperature range T = 1.7–3 K. Thus, the observed C(B) is a direct evidence for an intra‐site Coulomb interaction, U ≈ 2 meV, among the mobile charge carriers in the PEDOT‐rich regions. The lifting of spin degeneracy motivates PEDOT for use in spintronic applications.

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Intra‐Island Coulomb Correlations in PEDOT:PSS Thin Films; Saturation of Spin Polarization Magnetoresistance

Cited by 4 publications

References 29 publications

Synergistic effect of sequential solvent treatment on the structural and low temperature charge transport of PEDOT:PSS films

Synergistic effect of sequential solvent treatment on the structural and low temperature charge transport of PEDOT:PSS films

Magnetic Field Effects of Charge Transfer Excitons in Organic Semiconductor Devices

Magneto‐Capacitance of PEDOT:PSS Thin Films; Effects of a Two‐Phase System and Coulomb Interaction

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