The optimal Seebeck coefficient for obtaining the maximum power factor in thermoelectrics

Pichanusakorn, P.; Bandaru, Prabhakar R.

doi:10.1063/1.3147186

Cited by 57 publications

(42 citation statements)

References 13 publications

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“…(1) - (6) and 300K are summarized in Table IV and Table V, is generally consistent with the conclusion of a report on engineering the Seebeck coefficient to obtain the maximum thermoelectric power factor. 55 Without the inclusion of spin-orbit interaction our values of the ballistic ZT for the monolayer TMDC materials are consistent with a prior report on the monolayer thermoelectric properties of these TMDC materials. 23 Our calculations show that without the inclusion of spin-orbit interaction the peak n-type ZT values for all materials continue to occur at thicknesses above a single monolayer.…”

Section: Resultssupporting

confidence: 77%

Electronic and thermoelectric properties of few-layer transition metal dichalcogenides

Wickramaratne¹,

Zahid

Lake³

2014

The Journal of Chemical Physics

365

225

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The electronic and thermoelectric properties of one to four monolayers of MoS 2 , MoSe 2 , WS 2 , and WSe 2 are calculated. For few layer thicknesses, the near degeneracies of the conduction band K and Σ valleys and the valence band Γ and K valleys enhance the n-type and p-type thermoelectric performance. The interlayer hybridization and energy level splitting determine how the number of modes within k B T of a valley minimum changes with layer thickness. In all cases, the maximum ZT coincides with the greatest near-degeneracy within k B T of the band edge that results in the sharpest turn-on of the density of modes. The thickness at which this maximum occurs is, in general, not a monolayer. The transition from few layers to bulk is discussed. Effective masses, energy gaps, power-factors, and ZT values are tabulated for all materials and layer thicknesses.

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Section: Resultssupporting

confidence: 77%

Electronic and thermoelectric properties of few-layer transition metal dichalcogenides

Wickramaratne¹,

Zahid

Lake³

2014

The Journal of Chemical Physics

365

225

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“…While it was previously noted that the Seebeck coefficient was defined in the absence of an externally measured current, the definition does not preclude internal currents. Indeed, for a semiconductor with two types of carriers, i.e., the electrons (e: in the conduction band) and holes (h: in the valence band), 83 the overall S = S e σ e +S h σ h σ e +σ h similar in form to the S yy and the S z z components of Eqn. (17).…”

Section: A Thermoelectric Effects: the Anisotropy Of The Seebeck Coementioning

confidence: 99%

Layered thermal metamaterials for the directing and harvesting of conductive heat

et al. 2015

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The utility of a metamaterial, assembled from two layers of nominally isotropic materials, for thermal energy re-orientation and harvesting is examined. A study of the underlying phenomena related to heat flux manipulation, exploiting the anisotropy of the thermal conductivity tensor, is a focus. The notion of the assembled metamaterial as an effective thermal medium forms the basis for many of these investigations and will be probed. An overarching aim is to implement in such thermal metamaterials, functionalities well known from light optics, such as reflection and refraction, which in turn may yield insights on efficient thermal lensing. Consequently, the harness and dissipation of heat, which are for example, of much importance in energy conservation and improving electrical device performance, may be accomplished. The possibilities of energy harvesting, through exploiting anisotropic thermopower in the metamaterials is also examined. The review concludes with a brief survey of the outstanding issues and insights needed for further progress.

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“…where d is the dimension of the system and r is the power of the energy dependence of the scattering time in 26 have found that the thermopower takes a value of 130-187 µV/K, when α 2 σ is maximized. They further state that the optimized thermopower is almost independent of the system dimension and the scattering mechanism.…”

Section: Brief Summary Of Conventional Thermoelectricsmentioning

confidence: 99%

“…On the basis of the Boltzmann transport, 26 the thermopower of single-type carriers in a parabolic band is expressed as…”

Section: Brief Summary Of Conventional Thermoelectricsmentioning

confidence: 99%

Research Update: Oxide thermoelectrics: Beyond the conventional design rules

Terasaki

2016

APL Materials

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Materials' design for high-performance thermoelectric oxides is discussed. Since chemical stability at high temperature in air is a considerable advantage in oxides, we evaluate thermoelectric power factor in the high temperature limit. We show that highly disordered materials can be good thermoelectric materials at high temperatures, and the effects of strong correlation can further enhance the figure of merit by adding thermopower arising from the spin and orbital degrees of freedom. We also discuss the Kelvin formula as a promising expression for strongly correlated materials and show that the calculation based on the Kelvin formula can be directly compared with the cross-layer thermopower of layered materials. C 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license

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The optimal Seebeck coefficient for obtaining the maximum power factor in thermoelectrics

Cited by 57 publications

References 13 publications

Electronic and thermoelectric properties of few-layer transition metal dichalcogenides

Electronic and thermoelectric properties of few-layer transition metal dichalcogenides

Layered thermal metamaterials for the directing and harvesting of conductive heat

Research Update: Oxide thermoelectrics: Beyond the conventional design rules

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