Metallic nature of heavily doped polyacetylene derivatives: Thermopower

Park, Y. W.; Han, Wenqian; Choi, Cheoljun; Shirakawa, Hideki

doi:10.1103/physrevb.30.5847

Cited by 64 publications

(21 citation statements)

References 28 publications

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“…by Eq (32). to calculate the average hopping range R, the corresponding polaron effect dependence of Seebeck effect can be obtained.A polaron effect dependence of Seebeck coefficient at different carrier density has been shown inFig.…”

mentioning

confidence: 99%

A review of carrier thermoelectric-transport theory in organic semiconductors

Liu

2016

Phys. Chem. Chem. Phys.

103

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Carrier thermoelectric-transport theory has recently become of growing interest and numerous thermoelectric-transport models have been proposed for organic semiconductors, due to pressing current issues involving energy production and the environment. The purpose of this review is to provide a theoretical description of the thermoelectric Seebeck effect in organic semiconductors. Special attention is devoted to the carrier concentration, temperature, polaron effect and dipole effect dependence of the Seebeck effect and its relationship to hopping transport theory. Furthermore, various theoretical methods are used to discuss carrier thermoelectric transport. Finally, an outlook of the remaining challenges ahead for future theoretical research is provided.

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mentioning

confidence: 99%

A review of carrier thermoelectric-transport theory in organic semiconductors

Liu

2016

Phys. Chem. Chem. Phys.

103

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“…This reflects the fact that thermopower is an intrinsic property which is less affected by material irregularities than is resistivity, as we have found in various studies of conducting polymers and other materials. 16,17 …”

Section: Methodsmentioning

confidence: 98%

Thermopower behavior for the shape memory alloy NiTi

Lee

McIntosh

Kaiser

et al. 2001

Journal of Applied Physics

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We report thermopower measurements for the nickel titanium shape memory alloy Ni0.507Ti0.493. Our measurements reveal abrupt changes in the temperature dependence of thermopower, which correlate well with the structural phase transition between the austenitic and martensitic phases. These transition effects in thermopower are more clearly defined than in the resistivity, which is also reported. In the martensitic phase, thermopower exhibits standard metallic diffusion behavior with a nonlinearity, which is consistent with either a small peak in the density of states just below the Fermi level, as calculated by Kulkova, Egorushkin, and Kalchikhin [Solid State Commun. 77, 667 (1991)], or else electron–phonon mass enhancement. For thermally or mechanically treated samples, the magnitude of the transition effects in thermopower are reduced.

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“…Therefore, S of conductive polymers is dominated by S el , which is contributed by delocalized carriers in the polymer. For intrinsic and lightly doped conductive polymers, their S can increase or decrease by increasing the temperature, and their relationship can be described by the Mott's VRH model, where S exhibits T 1/2 dependence

S_{hop}^{el} = {\frac{k_{normalB}^{2} {(T_{0} T)}^{\frac{1}{2}}}{2 e} \frac{\partial \ln N (E)}{\partial E} |}_{E_{normalF}}

where N ( E ) is the density of states. However, by lifting doping levels, S is found to increase nearly linearly with the increasing temperature, which fails to be explained by Mott's VRH model.…”

Section: Fundamentals Of Conductive Polymersmentioning

confidence: 99%

Flexible Thermoelectric Materials and Generators: Challenges and Innovations

et al. 2019

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The urgent need for ecofriendly, stable, long‐lifetime power sources is driving the booming market for miniaturized and integrated electronics, including wearable and medical implantable devices. Flexible thermoelectric materials and devices are receiving increasing attention, due to their capability to convert heat into electricity directly by conformably attaching them onto heat sources. Polymer‐based flexible thermoelectric materials are particularly fascinating because of their intrinsic flexibility, affordability, and low toxicity. There are other promising alternatives including inorganic‐based flexible thermoelectrics that have high energy‐conversion efficiency, large power output, and stability at relatively high temperature. Herein, the state‐of‐the‐art in the development of flexible thermoelectric materials and devices is summarized, including exploring the fundamentals behind the performance of flexible thermoelectric materials and devices by relating materials chemistry and physics to properties. By taking insights from carrier and phonon transport, the limitations of high‐performance flexible thermoelectric materials and the underlying mechanisms associated with each optimization strategy are highlighted. Finally, the remaining challenges in flexible thermoelectric materials are discussed in conclusion, and suggestions and a framework to guide future development are provided, which may pave the way for a bright future for flexible thermoelectric devices in the energy market.

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Metallic nature of heavily doped polyacetylene derivatives: Thermopower

Cited by 64 publications

References 28 publications

A review of carrier thermoelectric-transport theory in organic semiconductors

A review of carrier thermoelectric-transport theory in organic semiconductors

Thermopower behavior for the shape memory alloy NiTi

Flexible Thermoelectric Materials and Generators: Challenges and Innovations

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