International Round-Robin Testing of Bulk Thermoelectrics

Wang, Hsin; Porter, Wallace D.; Bottner, Harold; König, Jan; Chen, Lidong; Bai, Shengqiang; Tritt, Terry M.; Mayolett, Alex; Smith, Charlene M.; Harris, Fred R.; Sharp, Jeff; Lo, Jason; Keinke, Holger; Kiss, László I.

doi:10.2172/1049790

Cited by 14 publications

(17 citation statements)

References 24 publications

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“…On this front, ORNL has a center. In one recent round-robin study lead by ORNL 103 One of the strategies that has been discussed before was 10 energy filtering at the interfaces 117,118,119 . In the energy-filtering approach, energy barriers are used to block the low-energy electrons and therefore, increase the average heat transported per carrier.…”

Section: Strategies For the Next Generation Of Nanocompositesmentioning

confidence: 99%

Perspectives on thermoelectrics: from fundamentals to device applications

Zebarjadi

Esfarjani

Dresselhaus

et al. 2012

Energy Environ. Sci.

1,176

776

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aThis review is an update of a previous review 1 published two years ago by some of the co-authors, focusing on progress made in thermoelectrics over the past two years on charge and heat carrier transport, 5 strategies to improve thermoelectric figure of merit, with new discussions on device physics and applications, and assessing challenges on these topics. Understanding of phonon transport in bulk materials has advanced significantly as the first-principles calculations are applied to thermoelectric materials, and experimental tools are being developed. Some new strategies have been developed to improve electron transport in thermoelectric materials. Fundamental questions on phonon and electron 10 transport across interfaces and in thermoelectric materials remain. With thermoelectric materials reaching high ZT values well above one, the field is ready to take a step forward and go beyond the materials' figure of merit. Developing device contacts and module fabrication techniques, an efficiency measurements platform, and identifying applications are becoming increasingly important for the future of thermoelectrics.15

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Section: Strategies For the Next Generation Of Nanocompositesmentioning

confidence: 99%

Perspectives on thermoelectrics: from fundamentals to device applications

Zebarjadi

Esfarjani

Dresselhaus

et al. 2012

Energy Environ. Sci.

1,176

776

View full text Add to dashboard Cite

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“…The total thermal conductivity (κ) was calculated according to the relationship κ = dCpD. Measurment uncertainties in the electrical resistivity, Seebeck coefficient, and thermal diffusivity were 4-9%, 4%, and 5-10%, respectively [22]. The Hall coefficient (RH) at 300 K was measured using a physical properties measurement system (PPMS-9, Quantum Design, USA) with a magnetic field from -3 to 3 T. The hole concentration (p) was calculated using p = 1/RHe, where e is the elementary charge.…”

Section: Characterizationmentioning

confidence: 99%

High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures

et al. 2017

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Mosaic-crystal microstructure is one of the optimal strategies for decoupling and balancing thermal and electrical transport properties in thermoelectric materials. Herein, we successfully achieve the desired nanoscale mosaic structures in triple-component Cu2-yS1/3Se1/3Te1/3 solid solutions using Cu2S, Cu2Se, and Cu2Te matrix compounds. They are solved in hexagonal structures with space group R3 ̅ m by means of single crystal structural solution and Rietveld refinement. Electron backscatter diffraction measurements show that all the samples are polycrystalline compounds with the grain size in the range of micrometers. However, transmission electron microscopic study reveals that these microscale grains are quasi-single crystals consist of a variety of 10-30 nm mosaic grains. Each mosaic grain is a perfect crystal but titled or rotated with respect to others by a very small angle. In this case, excellent electrical transports are maintained but exceptional low thermal conductivity is achieved throughout the whole temperature range, which is attributed to the combined phonon scatterings by point defects, liquid-like copper ions, and lattice strains or interfaces of mosaic nanograins. Combining all these favorable factors, remarkably high thermoelectric performance is achieved in Cu1.98S1/3Se1/3Te1/3 2 with a maximum zT of 1.9 at 1000 K.

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“…The thermal diffusivity, D, was determined via a flash technique using the AnterFlashline™ 3000 (current TA Instruments) under an argon atmosphere [21]. High intensity light beam from the xenon pulse was used.…”

Section: Thermoelectric Property Measurementsmentioning

confidence: 99%

“…The Seebeck coefficient, a, and the electrical conductivity, r, (by a four-probe method) were simultaneously measured on ZEM-3 (ULVAC RICO) under helium atmosphere [22].…”

Section: Thermoelectric Property Measurementsmentioning

confidence: 99%