Thermoelectric Materials Under Pressure

Alsaleh, Najebah Mohammed Abdullah; Shoko, Elvis; Arsalan, Muhammad; Schwingenschlögl, Udo

doi:10.1002/pssr.201800083

Cited by 14 publications

(9 citation statements)

References 82 publications

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“…Both p-and n-type polymers have developed rapidly with figure of merit zT increased from 10 -3 to 0.4 3,8 . The effects of oxidation 9 , pressure 10 and temperature have been studied. There have been many experimental results 11,12 demonstrating the temperature dependence of Seebeck coefficient, S. For example, for the polymer blends poly (3,4ethylenedioxythiophene): poly(styrenesulfonate)/polypyrrole (PEDOT:PSS/PPy), Li et al 13 showed that S monotonically increases with T. While, for the doped poly(2,5-bis(3-tetradecylthiophen-2yl)thieno [3,2-b]thiophene)(PBTTT) films with thermal annealing beforehand and the potassiumdoped poly(nickel-ethylenetetrathiolate) (poly (Ni-ett)), Zhang et al 14 and Sun et al 15 showed that when T rises, S first increases, then levels off, and finally decreases at higher T. We need to mention that thermopower measurement for organic conductors have been performed for a long time.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Temperature Dependence of the Seebeck Coefficient from First-Principles Band Structure Calculations for Organic Thermoelectric Materials

Liu

Wang

et al. 2021

CCS Chem

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The Seebeck effect measures the electric potential built up in materials under a temperature gradient. For organic thermoelectric materials, Seebeck coefficient shows more complicated temperature dependence than conventional systems, with both monotonic increase and nonmonotonic behavior, that is, first increase and then decrease. The mechanism behind the phenomenon is intriguing. Through the first-principles calculation coupled with Boltzmann transport equation, we demonstrate here some typical trends of Seebeck coefficient with temperature through analyzing band structures. The bandgap and bandwidths of valence band and conduction band jointly determine the effectiveness of thermal activation. Ineffective or effective thermal activation leads to a one-band or a two-band transport behavior, respectively.Under the thermal-activation mechanism, Seebeck coefficient shows monotonic temperature dependence in a one-band model but non-monotonic relationship in a two-band model. In particular, in the two-band model, Seebeck coefficient might show an ambipolar behavior, that is, its sign changes at high temperature.

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Section: Introductionmentioning

confidence: 99%

Understanding the Temperature Dependence of the Seebeck Coefficient from First-Principles Band Structure Calculations for Organic Thermoelectric Materials

Liu

Wang

et al. 2021

CCS Chem

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“…For example, a number of theoretical studies have indicated that with the use of various external factors, such as applied pressure or stress, one can attain very high ZT magnitudes in existing thermoelectric materials. [18][19][20][21][22] A primary criterion for potential thermoelectricity in a semiconductor or semimetal is a low value of the lattice thermal conductivity κ L that cannot be dramatically changed by the chemical substitution or by variation in carrier concentration, in contrast to thermoelectric power and electrical conductivity. Many existing thermoelectric materials have either layered crystal structures or structures incorporating voids or cavities ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Strategies and challenges of high-pressure methods applied to thermoelectric materials

Morozova

Korobeinikov

Ovsyannikov

2019

Journal of Applied Physics

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We describe the current state of experimental studies of the effects of applied high pressure or stress on the thermoelectric properties and performance parameters of thermoelectric materials, as well as the challenges faced in this area and possible directions for future work. We summarize and analyze literature data on the effects of high pressure on the Seebeck coefficient (thermoelectric power) of different materials that are related to common families of thermoelectrics, such as Bi

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“…Materials under high pressure lead to exciting results; here, the pressure modifies the lattice structure, shape, bonding, and intern result in the tuning of band structures and hence the optoelectronic properties. [52][53][54][55][56][57][58][59][60] For example, a large improvement in the thermoelectric properties of p-doped Sb 1.5 Bi 0.5 Te 3 was reported by Polvani et al [53] The Seebeck coefficient is improved from 212 to 305 μV K À1 with a pressure of 1.7 GPa and resulted in an enhanced zT value of 2.2. Similarly, Meng et al studied the thermoelectric properties of Nd x Ce 3Àx Pt 3 Sb 4, and significant improvement was observed.…”

Section: Pressure-induced Enhancementmentioning

confidence: 99%

Copper Sulfides: Earth‐Abundant and Low‐Cost Thermoelectric Materials

Mulla

Rabinal

2019

Energy Tech

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The depletion of nonrenewable energy sources insisted the search for new types of energy solutions. Thermoelectric conversion is one possible energy solution which converts waste heat into useful electricity. In the past several years, thermoelectric research developed many novel materials. Among these, most of the practically useful materials with better performance are based on Bi, Pb, Te, and Sb, but are toxic and expensive. There is a need of earth‐abundant, low‐cost, and less‐toxic compounds with superior thermoelectric performance so as to realize the large‐scale commercial applications. Recent studies have identified eco‐friendly thermoelectric materials based on the alloys of copper and sulfur, suggesting an alternative to the well‐established expensive thermoelectric materials. These compounds exhibit interesting electronic properties with better thermoelectric efficiency (zT). The structural properties permit to decouple electrical and thermal conductivities, which is an essential requirement to get improved efficiency. Several approaches, such as phase tuning, doping, nanostructure/microstructure designing, compound formation, etc., are chosen to increase the performance. On the whole, the present review summarizes the strategies and techniques that have been adopted to improve the thermoelectric behavior of copper sulfides and its compounds.

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Thermoelectric Materials Under Pressure

Cited by 14 publications

References 82 publications

Understanding the Temperature Dependence of the Seebeck Coefficient from First-Principles Band Structure Calculations for Organic Thermoelectric Materials

Understanding the Temperature Dependence of the Seebeck Coefficient from First-Principles Band Structure Calculations for Organic Thermoelectric Materials

Strategies and challenges of high-pressure methods applied to thermoelectric materials

Copper Sulfides: Earth‐Abundant and Low‐Cost Thermoelectric Materials

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