Carrier tuning and multiple phonon scattering induced high thermoelectric performance in n-type Sb-doped PbTe alloys

Liu, Hangtian; Chen, Zhiyu; Yin, Cong; Zhou, Biao; Liu, Bo; Ang, Ran

doi:10.1007/s00339-019-2525-9

Cited by 15 publications

(31 citation statements)

References 53 publications

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“…Among many good TE materials, the PbTe alloy was found to exhibit very favorable thermoelectric performance due to intrinsically lower thermal conductivity and larger power factor caused by band convergence [5]. Such a pioneering study stimulates a lot of subsequent works to further enhance its ZT values [10,11,12,13]. Recently, Sa et al proposed a series of two-dimensional (2D) group-IV chalcogenides (AX)2 with a novel stacking order of X-A-A-X (X = Se, Te and A = Si, Ge, Sn, Pb) [14].…”

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confidence: 99%

High thermoelectric performance can be achieved in two-dimensional (PbTe)2 layer

2020

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The electronic, phonon and thermoelectric transport properties of (PbTe)2 layer are systematically investigated by using first-principles pseudopotential method and Boltzmann transport equation. Our calculations demonstrate that there is a valley degeneracy of six for the top valence band, which leads to larger carrier concentration and thus higher electrical conductivity without obvious reduction in the Seebeck coefficient. Moreover, the intrinsic van der Waals interactions between neighboring Pb layers induce additional phonon scattering and thus ultrasmall lattice thermal conductivity. As a consequence, a maximum p-type ZT value of 2.9 can be achieved at 1000 K. Moreover, we find almost identical n-and p-type ZT in the temperature range from 300 K to 800 K. Thermoelectric (TE) materials can directly convert heat into electricity and thus attract much attention in the science community due to the increasing environmental pollution and energy crisis [1 ]. The conversion efficiency of a TE material can be determined by the dimensionless figure-of-merit 2 / ( ) e l ZT S T      [2], where S ,  , T, e  , l  are the Seebeck coefficient, the electrical conductivity, the absolute temperature, the electronic thermal conductivity and the lattice thermal conductivity, respectively. A good TE material is expected to have a high ZT value, which requires one to maximize the power factor ( 2 PF S   ) and simultaneously minimize the thermal conductivity ( = e l     ) as much as possible. Unfortunately, it is usually very

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confidence: 99%

High thermoelectric performance can be achieved in two-dimensional (PbTe)2 layer

2020

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“…In the case of the Sb‐doped sample, the conductivity slightly decreases as the doping content increases at room temperature owing to carrier mobility reduction. [ 30,35 ] Meanwhile, the absolute Seebeck coefficients obtained for both types range from 50 to 80 µV K −1 at room temperature and increase with increasing temperatures (Figure 3c,g). The highest values of 295.3 µV K −1 for p‐type and ‐227.6 µV K −1 for n‐type materials were obtained at 0.5% Na‐doped PbTe at 700 K and 0.5% Sb‐doped PbTe at 800 K, respectively.…”

Section: Resultsmentioning

confidence: 97%

“…Since the solubilities of Na and Sb in the PbTe matrix do not exceed 1.5%, the reduction in ζ-potentials can be attributed to formation of dopant-related second phases, including nanoprecipitates (Figure S3, Supporting Information). [29,30] These precipitates may decrease the absolute values of the ζ-potentials by reducing the charge imbalances between Pb 2+ and the dopant atoms.…”

Section: Doping-induced Viscoelasticity Of Pbte Te Inksmentioning

confidence: 99%

“…It is noteworthy that these maxima observed for the 3D-printed PbTe samples are significantly larger than that of pure PbTe and comparable to the recently reported values of Na-and Sb-doped bulk materials synthesized by the traditional hot-pressing process or melting method (Figure S13, Supporting Information). [29][30][31][32][33][34][35][36] Moreover, these values are among the highest the reported for TE materials fabricated by 3D printing with TE inks or pastes. [13][14][15][16][17][37][38][39] The average ZT values at the mid-temperature range from 500 to 800 K are 1.05 for p-type and 0.82 for n-type PbTe (Figure S14, Supporting Information), confirming the applicability of 3D printing for midtemperature waste heat recovery.…”

Section: Te Properties Of 3d-printed Pbte Materialsmentioning

confidence: 99%

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Doping‐Induced Viscoelasticity in PbTe Thermoelectric Inks for 3D Printing of Power‐Generating Tubes

Lee

Choo

et al. 2021

Advanced Energy Materials

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Thermoelectric (TE) technologies offer promising means to enhance fossil energy efficiencies by generating electricity from waste heat from industrial or automobile exhaust gases. For these applications, thermoelectric modules should be designed from the perspective of system integration for efficient heat transfer, system simplification, and low processing cost. However, typical thermoelectric modules manufactured by traditional processes do not fulfil such requirements, especially for exhaust pipes. Hence, a 3D‐printing method for PbTe thermoelectric materials is reported to design high‐performance power‐generating TE tubes. The electronic doping‐induced surface charges in PbTe particles are shown to significantly improve the viscoelasticities of inks without additives, thereby enabling precise shape and dimension engineering of 3D bulk PbTe with figures of merit of 1.4 for p‐type and 1.2 for n‐type materials. The performance of the power‐generating TE tube fabricated from 3D‐printed PbTe tubes is demonstrated experimentally and computationally as an effective strategy to design system‐adaptive high‐performance thermoelectric generators.

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“…Due to the symmetry crystal structure and large lattice anharmonicity, lead chalcogenide PbTe is widely utilized as a thermoelectric material in the medium-temperature region (500–900 K). , This inspires numerous efforts to improve the peak and average thermoelectric figures of merit of n-type PbTe materials to achieve a higher conversion efficiency. − However, the thermoelectric parameters are strongly coupled with each other, the compromise between carrier concentration and Seebeck coefficient ( n / S ), − the trade-off between effective mass and carrier mobility (μ/ m b * ), − even the only relatively independent parameter, and the lattice thermal conductivity, also contradictory to the carrier mobility (μ/κ l ), , which make it challenging to obtain the net enhancement of zT. Therefore, the solution of the aforementioned compromises among the thermoelectric parameters is of significance and necessary.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Thermoelectrics for Small-Bandwidth n-Type PbTe–MnTe Alloys via Balancing Compromise

Zhong

Liu

Deng

et al. 2021

ACS Appl. Mater. Interfaces

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Small-bandwidth n-type PbTe–MnTe alloys effectively modify the valley shape, while it also inevitably aggravates the deterioration of carrier mobility as nonpolar phonons dominate the scattering. It is found that a trace amount of Cu doping can alleviate the compromises among thermoelectric parameters, thereby significantly optimizing the electrical-transport performance near room temperature of n-type PbTe–MnTe alloys. The single-Kane model reveals that the physical origin of performance improvement lies in the carrier mobility enhancement and self-optimization of carrier concentration. The Debye–Callaway model further quantifies the contribution of copper defect scattering to the lattice thermal conductivity. Notably, the high thermoelectric quality factor obtained in this work rationalizes their superior properties and reveals immense potential for achieving higher zT. Herein, an extremely high zT of ∼0.52 at room temperature and a maximum zTmax of ∼1.2 at 823 K are achieved in 0.3% Cu-intercalated n-type PbTe–MnTe. The mechanism in balancing compromise elaborated in principle contributes to an improvement of thermoelectric properties of the n-type PbTe alloys in a broad temperature range.

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Carrier tuning and multiple phonon scattering induced high thermoelectric performance in n-type Sb-doped PbTe alloys

Cited by 15 publications

References 53 publications

High thermoelectric performance can be achieved in two-dimensional (PbTe)2 layer

High thermoelectric performance can be achieved in two-dimensional (PbTe)2 layer

Doping‐Induced Viscoelasticity in PbTe Thermoelectric Inks for 3D Printing of Power‐Generating Tubes

Enhancing Thermoelectrics for Small-Bandwidth n-Type PbTe–MnTe Alloys via Balancing Compromise

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