Soft phonon modes driven reduced thermal conductivity in self-compensated Sn1.03Te with Mn doping

Acharya, S.; Pandey, Juhi; Soni, Ajay

doi:10.1063/1.4963728

Cited by 72 publications

(60 citation statements)

References 42 publications

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“…Hence, as its analog, tin telluride (SnTe) with the rock‐salt crystal structure has been inspired with great interests . Especially, SnTe is nontoxic, earth‐abundant, and environment friendly, which makes it a great alternative of PbTe in the real industry applications . Compare to PbTe, intrinsic SnTe has inherent Sn vacancies and a high hole concentration of ≈10 20 to 10 21 cm −3 , leading to a low S .…”

Section: Introductionmentioning

confidence: 99%

Eco‐Friendly SnTe Thermoelectric Materials: Progress and Future Challenges

Moshwan

Yang

Zou

et al. 2017

Adv Funct Materials

333

260

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As a key type of emerging thermoelectric material, tin telluride (SnTe) has received extensive attention because of its low toxicity and eco-friendly nature. The recent trend shows that band engineering and nanostructuring can enhance thermoelectric performance of SnTe as intermediate temperature (400-800 K) thermoelectrics, which provides an alternative for toxic PbTe with the same operational temperature. This review highlights the key strategies to enhance the thermoelectric performance of SnTe materials through band engineering, carrier concentration optimization, synergistic engineering, and structure design. A fundamental analysis elucidates the underpinnings for the property improvement. This comprehensive review will boost the relevant research with a view to work on further performance enhancement of SnTe materials.where k B , e, h, m*, µ, and L are the Boltzmann constant, the carrier charge, the Planck's constant, the effective mass of the charge carrier, the carrier mobility, and the Lorenz number, respectively. As can be seen, S, σ, and κ e are interacted and conflict, which raises the difficulty to obtain high ZT. To solve these conflicts, extensive research has been carried out through band engineering to optimize S and σ, [5][6][7] and structuring to reduce the κ l . [8][9][10][11][12] Figure 1a summarizes recent significant achievements in different thermoelectric materials including SnSe, [25] 3%Na-(PbTe) 0.8 (PbS) 0.2 , [70] Cu 2 S 0.5 Te 0.5 , [71] and GeSbTe. [72] As can be seen, the current ZT values of the thermoelectric materials lie between 1 and 2, [7,[13][14][15][16][17][18][19][20][21][22][23] resulting in the fact that the current thermoelectric energy conversion efficiency is comparable to the other energy conversion technologies, such as photovoltaic cells, [22] and solar thermal plants. [22] Considerable research has been continuing to further drive ZT higher than 2 with the predicted efficiency over 20%, [24,25] which can attract highly exciting prospect in the energy generation and conservation fields.In terms of the industrial and automotive applications, waste heats are generally produced in the temperature range of 500-900 K. [26][27][28] To recover such waste heats, developing high-performance mid-temperature (400-900 K) thermoelectric materials is highly desired. For this purpose, lead telluride (PbTe) and its alloys have been considered as a primary material system. [7,10,14,17,29] However, the toxicity associated with Pb causes severe threat to the environment and needs to be alternated for domestic usage. [30] Hence, as its analog, tin telluride (SnTe) [21,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] with the rock-salt crystal structure has been inspired with great interests. [32] Especially, SnTe is nontoxic, earth-abundant, and environment friendly, [45] which makes it

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Section: Introductionmentioning

confidence: 99%

Eco‐Friendly SnTe Thermoelectric Materials: Progress and Future Challenges

Moshwan

Yang

Zou

et al. 2017

Adv Funct Materials

333

260

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“…More details of preparation and characterization details were described in our earlier work. [3][4][5] High temperature S and σ measurements were performed on a bar shape (~ 3 mm x 2 mm x 10 mm) samples in a homemade setup, where S was measured by differential method with ΔT = 10 K and σ in conventional four probe geometry under high vacuum. Quantum design physical property measurements system was used for low temperature transport and Hall Effect measurements.…”

Section: Methodsmentioning

confidence: 99%

“…Consequently, doping in SnTe has been used as an effective strategy to control charge carriers for TE application. [1][2][3][4][5] Technologically, TE materials can directly and reversibly convert waste heat to electrical energy for power generation and refrigeration with acoustically silent and emission free techniques. 6 The performance of any TE material depends on the dimensionless figure of merit, ZT = (S 2 σ/κ)T, where S is Seebeck coefficient, σ is electrical conductivity, κ is total thermal conductivity which has contributions from both electronic (κe) and lattice (κl) parts, and T is average absolute temperature, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…8 The prime challenge for TE application of SnTe is the intrinsic Sn vacancies which lead to high 'n' and hence extremely low S and high κ. [4][5][6] Further, having an analogous electronic band structure to PbTe, the SnTe also has contributions from both the valence bands of light (VB1) and heavy (VB2) holes. However, the energy difference (Eb) between the VB1 and VB2 valence bands in SnTe is too large compared to the same in PbTe, resulting in lesser contribution of heavy hole to S. [9][10][11][12] Due to these unfavourable factors, SnTe has a substantially limited TE performance.…”

Section: Introductionmentioning

confidence: 99%

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Rare earth doping and effective band-convergence in SnTe for improved thermoelectric performance

Acharya

Dey

Maitra

et al. 2018

Applied Physics Letters

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Thermoelectric performance of SnTe has been found to enhance with isovalent doping of alkaline and transition metal elements where most of these elements have solubility of less than 13%. We propose a strategy of doping rare earth element Yb to enhance the thermoelectric performance of SnTe. With heavy atomic mass and strong spin-orbit coupling, even the mild doping of Yb (~ 5%) is enough to create a degeneracy via band-convergence which enhances the density of states near Fermi level and improve overall performance. Our transport data and firstprinciples calculations corroborate that nearly 5% Yb is an efficient dopant to achieve thermoelectric response which is equivalent to 9% of Mn doping. The results are useful for understanding the environment-friendly thermoelectric SnTe.

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“…It had been demonstrated that these crystals exhibited a ferromagnetic phase and belonged to the diluted magnetic semiconductor (DMS) family (see, e.g., [6] and references therein). Over the last few years an alloying of SnTe with MnTe has been mostly considered as an efficient method of increasing the high SnTe thermoelectric performance [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Microhardness and the Young Modulus of Thin, MBE-Grown, (Sn,Mn)Te Layers Containing up to 8% of Mn

et al. 2017

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The thin layers of (Sn,Mn)Te solid solution were grown by molecular beam epitaxy onto (111)-oriented BaF2 substrates and characterized by scanning electron microscopy, atomic force microscopy, energy dispersive X-ray spectrometry, and X-ray diffraction methods. The epitaxial character of the growth was confirmed. All the layers exhibited a regular (fcc) structure of the rock-salt type and were (111)-oriented, their thickness was close to about 1 µm. The layers contained up to 8% of Mn. The microhardness and the Young modulus values were determined by the nanoindentation measurements. The Berkovich type of the intender was applied, the maximum applied load was equal to 1 mN. The results of measurements demonstrated a lack of the composition dependence of the Young modulus value. A slight increase of the microhardness value with an increasing Mn content in the (Sn,Mn)Te solid solution was observed.

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Soft phonon modes driven reduced thermal conductivity in self-compensated Sn1.03Te with Mn doping

Cited by 72 publications

References 42 publications

Eco‐Friendly SnTe Thermoelectric Materials: Progress and Future Challenges

Eco‐Friendly SnTe Thermoelectric Materials: Progress and Future Challenges

Rare earth doping and effective band-convergence in SnTe for improved thermoelectric performance

Microhardness and the Young Modulus of Thin, MBE-Grown, (Sn,Mn)Te Layers Containing up to 8% of Mn

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