Low-Dimensional Organic Crystal Tetrathiotetracene–Iodide as Thermoelectric Material: Reality and Prospects

Caspian, Anatolie; Stockholm, J.G.; Dusciac, V.; Nicic, Veaceslav

doi:10.1166/jno.2009.1008

Cited by 10 publications

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“…Crystals with σ xx = 10 6  -1 m -1 were also reported [18], however S xx and  xx were not measured in them. The modeling shows that when σ xx increases, the electronic part of thermal conductivity increases too, so that ZT remains small.…”

Section: Resultsmentioning

confidence: 99%

“…The structure of Q1D organic crystals of tetrathiotetracene-iodide, TTT 2 I 3 , has been briefly described in [18]. The crystals have needle shape and are formed of segregate stacks or chains of planar TTT molecules and…”

Section: Ttt 2 I 3 Crystals In 2d Aproximationmentioning

confidence: 99%

“…Respectively, the electrical conductivity along the molecular chains is almost by three orders of magnitude higher than in the transversal direction to the chains. Due to this fact, earlier [17][18] we have neglected the possibility for a carrier to pass from one conducting chain to another and have considered the transport in a 1D conduction band. Now we will estimate the effect of interchain interaction and the restrictions on thermoelectric efficiency that this interaction will involve.…”

Section: Ttt 2 I 3 Crystals In 2d Aproximationmentioning

confidence: 99%

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Thermoelectric Properties of Tetrathiotetracene Iodide Crystals: Modeling and Experiment

Casian

Sanduleac

2014

Journal of Elec Materi

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cel Mare av. 168, Chisinau, Rep. of Moldova A more complete physical model for nanostructured crystals of tetrathiotetracene-iodide that takes into account the interaction of carriers with the neighboring one-dimensional (1D) conductive chains and also the scattering on impurities and defects is presented. For simplicity the 2D approximation is applied. It is shown that this model describes very well the temperature dependencies of electrical conductivity in the temperature interval between 180 and 300 K and of Seebeck coefficient between 50 and 300 K, the highest temperature for which the measurements were reported. For lower temperatures it is needed to also consider the fluctuations of dielectric phase which appear before the metal-dielectric transition. It is found that the predictions made in 1D approximation are valid, if the crystal purity is not very high, the electrical conductivity is limited up to ~ 3.5106  -1 m -1 and the thermoelectric figure of merit up to ZT ~ 4.

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Section: Resultsmentioning

confidence: 99%

Section: Ttt 2 I 3 Crystals In 2d Aproximationmentioning

confidence: 99%

Section: Ttt 2 I 3 Crystals In 2d Aproximationmentioning

confidence: 99%

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Thermoelectric Properties of Tetrathiotetracene Iodide Crystals: Modeling and Experiment

Casian

Sanduleac

2014

Journal of Elec Materi

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“…[25]). We have taken 1 = 1 6, which corresponds to the polarizability of TTT molecule, 0 = 42 Å −3 .…”

Section: Numerical Resultsmentioning

confidence: 99%

“…High values of ZT ∼ 20 were predicted by us for such crystals [17][18][19] under defined conditions. Values of ZT ∼ 15 at room temperature were predicted 20 in molecular nanowires of conducting polymers.…”

Section: Introductionmentioning

confidence: 93%

Thermoelectric Properties of Nanostructured Tetrathiotetracene Iodide Crystals in a Two-Dimensional Model

Sanduleac¹,

Casian²,

Pflaum³

2014

Journal of Nanoelectronics and Optoelectronics

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Previously, it has been predicted that nanostructured crystals of tetrathiotetracene iodide are very promising candidates for thermoelectric applications. However, these predictions are based on a strictly one-dimensional (1D) model. In order to verify these conclusions, a two-dimensional (2D) model is elaborated which explicitly takes into account the weak interaction of carriers with the nearest conductive chains. It is shown that for crystals with a rather low degree of purity this interaction does not affect significantly the results obtained by the 1D approximation, but for ultrapure crystals this interaction can no longer be neglected.

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Organic Thermoelectric Materials: Emerging Green Energy Materials Converting Heat to Electricity Directly and Efficiently

et al. 2014

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The abundance of solar thermal energy and the widespread demands for waste heat recovery make thermoelectric generators (TEGs) very attractive in harvesting low-cost energy resources. Meanwhile, thermoelectric refrigeration is promising for local cooling and niche applications. In this context there is currently a growing interest in developing organic thermoelectric materials which are flexible, cost-effective, eco-friendly and potentially energy-efficient. In particular, the past several years have witnessed remarkable progress in organic thermoelectric materials and devices. In this review, thermoelectric properties of conducting polymers and small molecules are summarized, with recent progresses in materials, measurements and devices highlighted. Prospects and suggestions for future research efforts are also presented. The organic thermoelectric materials are emerging candidates for green energy conversion.

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Low-Dimensional Organic Crystal Tetrathiotetracene–Iodide as Thermoelectric Material: Reality and Prospects

Cited by 10 publications

References 0 publications

Thermoelectric Properties of Tetrathiotetracene Iodide Crystals: Modeling and Experiment

Thermoelectric Properties of Tetrathiotetracene Iodide Crystals: Modeling and Experiment

Thermoelectric Properties of Nanostructured Tetrathiotetracene Iodide Crystals in a Two-Dimensional Model

Organic Thermoelectric Materials: Emerging Green Energy Materials Converting Heat to Electricity Directly and Efficiently

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