High thermoelectric performance due to nano-inclusions and randomly distributed interface potentials in N-type (PbTe0.93−xSe0.07Clx)0.93(PbS)0.07composites

Ginting, Dianta; Lin, Chan Chieh; Rathnam, Lydia; Yun, Jung‐Ho; Yu, Byung Kyu; Kim, Sung Jin; Rhyee, Jong‐Soo

doi:10.1039/c7ta02643a

Cited by 26 publications

(28 citation statements)

References 41 publications

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“…Energies 2020, 13, 72 4 of 29 The lattice parameters of PbTe, PbSe, and PbS are 3.22, 3.07, and 2.965 Å , respectively, along the (200) plane [31,32]. Numerous nanoprecipitates are also found in K-doped (Pb0.98K0.02Te)0.7(PbSe)0.25(PbS)0.05 [7] and Cl-doped (PbTe0.93−xSe0.07Clx)0.93(PbS)0.07 ( = 0.0005) [11], which are synthesized by same process with (PbTe)0. 75 Figures 3d and 4f, respectively.…”

Section: Figures 2a and 2bmentioning

confidence: 96%

“…low Cl-doping level ( = 0.0005), which is a very high value in n-type thermoelectric materials. The randomly distributed interface potential induced by Fermi level tuning with nanoinclusions is a new technique for investigating thermoelectric properties [11]. The nanoprecipitates (Figure 4) show a strong lattice strain near precipitates in (PbTe0.93−xSe0.07Clx)0.93(PbS)0.07 alloys from TEM images, and their electron diffraction and strain field map from IFFT mapping of TEM are also shown.…”

Section: High Thermoelectric Performance Due To Nanoinclusions and Ramentioning

confidence: 99%

“…[68], PbSe1−xClx [69], PbS1−xClx [14], PbTe0.9Se0.1 [63], PbSe0.84Se0.16 [29], and PbTe0.75−xClxSe0.1S0.15 [22]. Reproduced with permission from [11], copyright 2017 the Royal Society of Chemistry. [14], PbTe 0.9 Se 0.1 [63], PbSe 0.84 Se 0.16 [29], and PbTe 0.75−x Cl x Se 0.1 S 0.15 [22].…”

Section: High Thermoelectric Performance Due To Nanoinclusions and Ramentioning

confidence: 99%

“…Semiconductor PbTe of p-type can be produced by doping with Tl, Na, and K on Pb sites [5,[7][8][9][10]. On the other hand, n-type PbTe can be produced by Cl doping on the Te site [11]. In addition, its low content in the Earth's crust and the high cost of tellurium inhibit the usage of PbTe in large-scale production.…”

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Synergetic Approach for Superior Thermoelectric Performance in PbTe-PbSe-PbS Quaternary Alloys and Composites

2019

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Thermoelectric power generation is an energy conversion technology from heat to electric energy, which can be applied to waste heat power conversion. Among thermoelectric materials (TE), PbTe-PbSe-PbS quaternary alloys and composites are promising candidates for thermoelectric power generation applications in the mid-temperature operating range from 500 to ~850 K. Besides, the thermoelectric performance of quaternary alloys and composites is not fully optimized regarding its composition and synthesis process. In the quaternary system, PbTe-PbSe-PbS, it was found that PbS will form nanoprecipitation in the matrix of quaternary alloy for a small content of PbS (≤0.07), which reduces the lattice thermal conductivity. The power factor of PbTe-PbSe-PbS quaternary alloys can be significantly enhanced by using a band convergence in PbTe1−xSex. The band structure modifications, with the result of simultaneous PbS nanoprecipitation, give rise to a high Z T value of 2.3 at 800 K for (PbTe)0.95−x(PbSe)x(PbS)0.05. The chemical potential tuning by effective K-doping ( x = 0.02) and PbS substitution reveals a high power factor and low thermal conductivity, resulting in a comparatively high Z T value of 1.72 at 800 K. The combination of a high Seebeck coefficient and low thermal conductivity results in a very high Z T value of 1.52 at 700 K as n-type materials for low Cl-doped ( x = 0.0005) (PbTe0.93−xSe0.07Clx)0.93(PbS)0.07 composites. Therefore, this review presents the simultaneous emergence of effective chemical potential tuning, band convergence, and nanoprecipitation, giving rise to a significant enhancement of the thermoelectric performance of both p - and n -type PbTe-PbSe-PbS quaternary alloy and composite TE materials.

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Section: Figures 2a and 2bmentioning

confidence: 96%

Section: High Thermoelectric Performance Due To Nanoinclusions and Ramentioning

confidence: 99%

Section: High Thermoelectric Performance Due To Nanoinclusions and Ramentioning

confidence: 99%

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Synergetic Approach for Superior Thermoelectric Performance in PbTe-PbSe-PbS Quaternary Alloys and Composites

2019

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“…A diversity of approaches have been applied to PbTe-based materials for ZT enhancements, such as carrier concentration optimization [16,17], introduction of resonance level [18,19], electronic band engineering [6,20,21] and microstructure engineering [8,22]. Recent researches also highlight lattice dislocations as an effective phonon scattering source to further suppress the lattice thermal conductivity of lead chalcogenides [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermoelectric performance of Na-doped PbTe synthesized under high pressure

Cai

Sun

et al. 2018

Sci. China Mater.

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From Dislocation to Nano‐Precipitation: Evolution to Low Thermal Conductivity and High Thermoelectric Performance in n‐Type PbTe

Deng

Wang

et al. 2020

Adv Funct Materials

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PbTe-based alloys have been widely used as mid-temperature thermoelectric (TE) materials since the 1960s. Years of endeavor spurred the tremendous advances in their TE performance. The breakthroughs for n-type PbTe have been somewhat less impressive, which limits the overall conversion efficiency of a PbTe-based TE device. In light of this obstacle, an n-type Ga-doped PbTe via an alternative thermodynamic route that relies on the equilibrium phase diagram and microstructural evolution is revisited. Herein, a plateau of zT = 1.2 is achieved in the best-performing Ga 0.02 Pb 0.98 Te in the temperature range of 550-673 K. Notably, an extremely high average zT ave = 1.01 is obtained within 300 − 673 K. The addition of gallium optimizes the carrier concentration and boosts the power factor PF = S 2 ρ −1. Meanwhile, the κ L of Ga-PbTe reveals a significantly decreasing tendency owing to the defect evolution that changes from dislocation loop to nano-precipitation with increasing Ga content. The pathway for both the κ L reduction and defect evolution can be probed by an equilibrium phase diagram, which opens up a new avenue for locating high zT TE materials.

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High thermoelectric performance due to nano-inclusions and randomly distributed interface potentials in N-type (PbTe_0.93−xSe_0.07Cl_x)_0.93(PbS)_0.07composites

Abstract: The nano-inclusion in a matrix effectively scatters phonons and the band bending effect at the interfaces can selectively scatter carriers, resulting in the enhancement of thermoelectric performance.

Cited by 26 publications

References 41 publications

Synergetic Approach for Superior Thermoelectric Performance in PbTe-PbSe-PbS Quaternary Alloys and Composites

Synergetic Approach for Superior Thermoelectric Performance in PbTe-PbSe-PbS Quaternary Alloys and Composites

Enhanced thermoelectric performance of Na-doped PbTe synthesized under high pressure

From Dislocation to Nano‐Precipitation: Evolution to Low Thermal Conductivity and High Thermoelectric Performance in n‐Type PbTe

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