Realizing record high performance in n-type Bi<sub>2</sub>Te<sub>3</sub>-based thermoelectric materials

Zhu, Bin; Liu, Xixi; Wang, Qi; Qiu, Yang; Shu, Zhong; Guo, Zuteng; Yao, Takeshi; Cui, Juan; Gu, Meng; He, Jiaqing

doi:10.1039/d0ee01349h

Cited by 344 publications

(261 citation statements)

References 34 publications

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“…5D ), which is actually higher than any of the experimental results in various devices reported before. Note that the η max obtained in this work is highly comparable to that of conventional Bi 2 Te 3 devices ( 6 , 7 , 40 ) and the recently reported MgAgSb one ( 41 ) near room temperature (Δ T < 250 K), which can be understood by their comparable zT (fig. S7) as well as the stable and high compatibility factor of GeTe alloys at these temperatures.…”

Section: Resultssupporting

confidence: 85%

“… Current-dependent output voltage ( A ), output power ( B ), efficiency ( C ), and its maximum ( D ) for the single-leg devices under different temperature gradients, with a comparison to literature results ( 6 – 9 , 28 , 40 , 41 , 43 , 52 – 54 ) and prediction. TAGS, (GeTe) 1– x (AgSbTe 2 ) x ; HH, Half-Heusler; BT, Bi 2 Te 3 ; SKD, skutterudite.…”

Section: Resultsmentioning

confidence: 99%

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Realizing a 14% single-leg thermoelectric efficiency in GeTe alloys

et al. 2021

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GeTe alloys have recently attracted wide attention as efficient thermoelectrics. In this work, a single-leg thermoelectric device with a conversion efficiency as high as 14% under a temperature gradient of 440 K was fabricated on the basis of GeTe-Cu2Te-PbSe alloys, which show a peak thermoelectric figure of merit (zT) > 2.5 and an average zT of 1.8 within working temperatures. The high performance of the material is electronically attributed to the carrier concentration optimization and thermally due to the strengthened phonon scattering, the effects of which all originate from the defects in the alloys. A design of Ag/SnTe/GeTe contact successfully enables both a prevention of chemical diffusion and an interfacial contact resistivity of 8 microhm·cm2 for the realization of highly efficient devices with a good service stability/durability. Not only the material’s high performance but also the device’s high efficiency demonstrated the extraordinariness of GeTe alloys for efficient thermoelectric waste-heat recovery.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Realizing a 14% single-leg thermoelectric efficiency in GeTe alloys

et al. 2021

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“… Comparison of the measured conversion efficiency ( η max , lines with symbols) among the Te-free modules in this work under a series of temperature difference (Δ T ). The η max of the Bi 2 Te 3 -based modules from the literature (dashed lines) were also plotted for comparison 8 , 9 , 33 – 35 . The inset shows the photograph of a segmented Te-free module.…”

Section: Resultsmentioning

confidence: 99%

Towards tellurium-free thermoelectric modules for power generation from low-grade heat

et al. 2021

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Thermoelectric technology converts heat into electricity directly and is a promising source of clean electricity. Commercial thermoelectric modules have relied on Bi2Te3-based compounds because of their unparalleled thermoelectric properties at temperatures associated with low-grade heat (<550 K). However, the scarcity of elemental Te greatly limits the applicability of such modules. Here we report the performance of thermoelectric modules assembled from Bi2Te3-substitute compounds, including p-type MgAgSb and n-type Mg3(Sb,Bi)2, by using a simple, versatile, and thus scalable processing routine. For a temperature difference of ~250 K, whereas a single-stage module displayed a conversion efficiency of ~6.5%, a module using segmented n-type legs displayed a record efficiency of ~7.0% that is comparable to the state-of-the-art Bi2Te3-based thermoelectric modules. Our work demonstrates the feasibility and scalability of high-performance thermoelectric modules based on sustainable elements for recovering low-grade heat.

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“…This may be due to the dominance of phonon scattering in the low temperature regime and above ~170 K, the onset of the bipolar conduction in the material results in the observed temperature dependent behaviour of L. 37 Similarly low values of L have been reported in some related TE material, viz., melt spun Bi2Te3 based compounds, 38,39 Bi0.5Sb1.5Te3/C60 nanocomposite 13 and doped PbTe. 40 Furthermore, the L value obtained for the present Bi2Te3/graphite nanocomposite sample (x = 1.0) approaches the theoretical minimum , min of 0.28 Wm -1 K -1 for Bi2Te3 based materials estimated using the Cahill-Pohl model in the high temperature limit.…”

Section: Thermoelectric Properties Characterizationmentioning

confidence: 99%

Evidence of improvement in thermoelectric parameters of n-type Bi2Te3/graphite nanocomposite

Singha

Das

Kulbachinskii

et al. 2021

Journal of Applied Physics

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Improvement of thermoelectric parameters is reported with graphite incorporation in n-type Bi2Te3/graphite nanocomposite system. In-depth thermoelectric properties of nanostructured Bi2Te3/graphite composites are probed both microscopically and macroscopically using X-ray diffraction, Raman spectroscopy, inelastic neutron scattering and measurement of the temperature dependence of thermal conductivity , Seebeck coefficient S, resistivity ρ, and carrier concentration nH. Raman spectroscopic analysis confirms that graphite introduces defects and disorder in the system. Graphite addition induces a large (17%) decrease of , originating from a strong phonon scattering effect. A low lattice thermal conductivities L, value of 0.77 Wm -1 K -1 , approaching the min value, estimated using the Cahill-Pohl model, is reported for Bi2Te3+1 wt% graphite sample.Graphite dispersion alters the low energy inelastic neutron scattering spectrum providing evidence for modification of the Bi2Te3 Phonon Density of States (PDOS). Improvement of the other thermoelectric parameters, viz., Seebeck Coefficient and resistivity, is also reported. Theoretical modeling of electrical and thermal transport parameters is carried out and a plausible explanation of the underlying transport mechanism is provided assuming a simple model of ballistic electron transport in 1D contact channels with two different energies.

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Realizing record high performance in n-type Bi₂Te₃-based thermoelectric materials

Abstract: High performance BiTeSe alloys and modules with a conversion efficiency of 6.6% are achieved through potential wells and multi-scale structures.

Cited by 344 publications

References 34 publications

Realizing a 14% single-leg thermoelectric efficiency in GeTe alloys

Realizing a 14% single-leg thermoelectric efficiency in GeTe alloys

Towards tellurium-free thermoelectric modules for power generation from low-grade heat

Evidence of improvement in thermoelectric parameters of n-type Bi2Te3/graphite nanocomposite

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Realizing record high performance in n-type Bi2Te3-based thermoelectric materials

Abstract: High performance BiTeSe alloys and modules with a conversion efficiency of 6.6% are achieved through potential wells and multi-scale structures.

Cited by 344 publications

References 34 publications

Realizing a 14% single-leg thermoelectric efficiency in GeTe alloys

Realizing a 14% single-leg thermoelectric efficiency in GeTe alloys

Towards tellurium-free thermoelectric modules for power generation from low-grade heat

Evidence of improvement in thermoelectric parameters of n-type Bi2Te3/graphite nanocomposite

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Realizing record high performance in n-type Bi₂Te₃-based thermoelectric materials