Novel Hybrid Organic Thermoelectric Materials:Three‐Component Hybrid Films Consisting of a Nanoparticle Polymer Complex, Carbon Nanotubes, and Vinyl Polymer

Toshima, Naoki; Oshima, Koichiro; Anno, Hiroaki; Nishinaka, Takahiko; Ichikawa, Shoko; Iwata, Aya; Shiraishi, Yukihide

doi:10.1002/adma.201405463

Cited by 161 publications

(130 citation statements)

References 24 publications

(31 reference statements)

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“…In DMSOtreated PEDOT: PSS, ZT ~ 0.42 was achieved by minimizing the total dopant volume [7]. High values of ZT were reported in mixed organic and inorganic compounds, such as hybrid material composed of nanoparticles of a polymer complex, carbon nanotubes and poly(vinyl chloride), ZT ~ 0.3 [8]. Important value, ZT = 0.57 at room temperature was measured in phenyl acetylene-capped silicon nano particles [9].…”

Section: Introductionmentioning

confidence: 98%

Nanostructured TTT(TCNQ)2 Organic Crystals as Promising Thermoelectric n-Type Materials: 3D Modeling

Sanduleac

Casian

2015

Journal of Elec Materi

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cel Mare av. 168, Chisinau, Rep. of Moldova Thermoelectric properties of quasi-one-dimensional TTT(TCNQ) 2 organic crystals are investigated in order to appreciate the prospect of using this compound as n -type thermoelectric material. A more complete three-dimensional (3D) physical model is elaborated. It takes into account two the most important interactions of conduction electrons with longitudinal acoustic phonons, the electrons' scattering on neighbor molecular chains, as well as the scattering by impurities and defects. The electrical conductivity, thermopower, the power factor, electronic thermal conductivity and the thermoelectric figure of merit in the direction along conductive molecular chains are calculated numerically for different degrees of crystal purity. It is shown that in stoichiometric compounds the thermoelectric figure of merit ZT remains small even after the increase of crystal perfection degree. The thermoelectric properties may be significantly enhanced by simultaneous increase of crystal perfection and of electron concentration. The latter can be achieved by additional doping with donors. For less pure crystals, the interaction with impurities predominates over the weak interchain interaction and the simpler one-dimensional (1D) physical model is applicable. When the impurity scattering is reduced, the interchain interaction begins to limit the carrier mobility and the application of the 3D physical model is required. The optimal parameters permitting to predict ZT ~ 1 are determined.

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Section: Introductionmentioning

confidence: 98%

Nanostructured TTT(TCNQ)2 Organic Crystals as Promising Thermoelectric n-Type Materials: 3D Modeling

Sanduleac

Casian

2015

Journal of Elec Materi

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“…[1][2][3][4][5] Notably, the intrinsically low thermal conductivity of organic semiconductors is favorable for attaining high TE performance. The energy conversion efficiency of a TE material is evaluated by the dimensionless figure of merit: ZT = S 2 σT κ À1 (S, σ, κ and T are the Seebeck coefficient, electrical conductivity, thermal conductivity and absolute temperature, respectively).…”

Section: Introductionmentioning

confidence: 99%

Highly anisotropic P3HT films with enhanced thermoelectric performance via organic small molecule epitaxy

et al. 2016

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Conducting polymers are potential candidates for thermoelectric (TE) applications owing to their low thermal conductivity, non-toxicity and low cost. However, the coil conformation and random aggregation of polymer chains usually degrade electrical transport properties, thus deteriorating TE performance. In this work, we fabricated poly(3-hexylthiophene) (P3HT) films with highly oriented morphology using 1,3,5-trichlorobenzene (TCB), an organic small-molecule, as a template for polymer epitaxy under a temperature gradient crystallization process. The resulting P3HT molecules, which were confirmed to be highly anisotropic by a combination of scanning electron microscopy, atomic force microscopy, polarizing microscope, polarized Raman spectroscopy, and two-dimensional-grazing incidence X-ray diffraction (GIXRD) analysis, not only markedly reduced the conjugated defects along the polymer backbone, but also effectively increased the degree of electron delocalization. These combined phenomena produced an efficient, 1D path for carrier movement and therefore resulted in enhanced carrier mobility in the TCB-treated P3HT films. The maximum values of the electrical conductivity and Seebeck coefficient were 320 S cm À1 and 269 μV K À1 , respectively. Consequently, the maximum TE power factor and ZT value at 365 K reached 62.4 μW mK À2 and 0.1, respectively, in the parallel direction of the TCB-treated P3HT film. To the best of our knowledge, these are the highest values reported for pure P3HT TE materials. The method of using organic small-molecule epitaxy to generate highly anisotropic polymer films is expected to be valid for many conducting polymers.

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“…Thanks to ambient stability and exciting thermoelectric characteristics, ZT value was equal to 0.2 at 400 K. This inspired other groups to work with this polymer for thermoelectrical applications [65] or to develop its composites with carbon nanotubes [66][67][68]. One major drawback of poly[K x (Ni-et)] is its poor processability due to its completely insoluble nature leading to suspensions with broad particle size distributions.…”

Section: Thermoelectrics For Power Generation -A Look At Trends In Thmentioning

confidence: 99%

Progress in Polymer Thermoelectrics

Stepien¹,

Roch²,

Tkachov³

et al. 2016

Thermoelectrics for Power Generation - A Look at Trends in the Technology

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This chapter addresses recent progress in the ield of polymer thermoelectric materials. It covers a brief introduction to intrinsically conductive polymers and its motivation for thermoelectric utilization. A review about important and recent literature in the ield of p-type and n-type polymers for thermoelectric applications is summarized here. For a beter understanding of material development issues, doping mechanisms for intrinsically conducting polymers are discussed. Special emphasis is given to n-type polymers, since this group of polymers is often neglected due to unavailability or poor stability during processing. Diferent possibilities in terms of generator design and fabrication are presented. Recent challenges in this scientiic ield are discussed in respect to current material development, uncertainty during the measurement of thermoelectric properties as well as temperature stability for the most prominent p-type polymer used for thermoelectric, PEDOT:PSS.

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Novel Hybrid Organic Thermoelectric Materials:Three‐Component Hybrid Films Consisting of a Nanoparticle Polymer Complex, Carbon Nanotubes, and Vinyl Polymer

Cited by 161 publications

References 24 publications

Nanostructured TTT(TCNQ)2 Organic Crystals as Promising Thermoelectric n-Type Materials: 3D Modeling

Nanostructured TTT(TCNQ)2 Organic Crystals as Promising Thermoelectric n-Type Materials: 3D Modeling

Highly anisotropic P3HT films with enhanced thermoelectric performance via organic small molecule epitaxy

Progress in Polymer Thermoelectrics

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