Distinct role of Sn and Ge doping on thermoelectric properties in p-type (Bi, Sb)2Te3-alloys

Zhang, Zengkai; Cao, Yu; Tao, Qirui; Yan, Yonggao; Su, Xianli; Tang, Xinfeng

doi:10.1016/j.jssc.2020.121722

Cited by 16 publications

(5 citation statements)

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“…Band engineering approaches in TE materials, such as resonant level doping, electronic band convergence, and band curvedness, have improved the power factor. When the energy level of the dopant is close to the valence band or conduction band, this circumstance may result in adding extra energy levels to the host band, resulting in a distortion of the electronic DOS that is known as resonant doping [ 195 , 196 , 197 ]. This distortion may modify the DOS when the Fermi level is close to the resonant state, which increases the density of states without changing the carrier concentration significantly, resulting in a significant increase in the Seebeck coefficient, as demonstrated in Equation (6) [ 198 ].…”

Section: Improvement Strategies For Thermoelectric Materials Performancementioning

confidence: 99%

Advancing Thermoelectric Materials: A Comprehensive Review Exploring the Significance of One-Dimensional Nano Structuring

et al. 2023

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Amidst the global challenges posed by pollution, escalating energy expenses, and the imminent threat of global warming, the pursuit of sustainable energy solutions has become increasingly imperative. Thermoelectricity, a promising form of green energy, can harness waste heat and directly convert it into electricity. This technology has captivated attention for centuries due to its environmentally friendly characteristics, mechanical stability, versatility in size and substrate, and absence of moving components. Its applications span diverse domains, encompassing heat recovery, cooling, sensing, and operating at low and high temperatures. However, developing thermoelectric materials with high-performance efficiency faces obstacles such as high cost, toxicity, and reliance on rare-earth elements. To address these challenges, this comprehensive review encompasses pivotal aspects of thermoelectricity, including its historical context, fundamental operating principles, cutting-edge materials, and innovative strategies. In particular, the potential of one-dimensional nanostructuring is explored as a promising avenue for advancing thermoelectric technology. The concept of one-dimensional nanostructuring is extensively examined, encompassing various configurations and their impact on the thermoelectric properties of materials. The profound influence of one-dimensional nanostructuring on thermoelectric parameters is also thoroughly discussed. The review also provides a comprehensive overview of large-scale synthesis methods for one-dimensional thermoelectric materials, delving into the measurement of thermoelectric properties specific to such materials. Finally, the review concludes by outlining prospects and identifying potential directions for further advancements in the field.

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Section: Improvement Strategies For Thermoelectric Materials Performancementioning

confidence: 99%

Advancing Thermoelectric Materials: A Comprehensive Review Exploring the Significance of One-Dimensional Nano Structuring

et al. 2023

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“…49 This situation may lead to adding additional energy states to the host band, creating a distortion known as resonant doping. 133,134 When the Fermi level lies near the resonant state, significant enhancement in m* occurred due to the increased density of states, therefore, the Seebeck coefficient increased without changing carrier concentration. 128 Schematic illustrations of resonant states 135 show a high density of states, as shown in Fig.…”

Section: Achieving Resonant State To Increase Seebeck Coefficientmentioning

confidence: 99%

A Review on Fundamentals, Design and Optimization to High ZT of Thermoelectric Materials for Application to Thermoelectric Technology

Kumar

Bano

Govind

et al. 2021

J. Electron. Mater.

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Thermoelectricity has been proven as a potential technology for the conversion of waste heat into usable electricity. It involves primarily three parameters, namely the Seebeck coefficient, electrical conductivity, and thermal conductivity. However, there are many other interrelated parameters, such as carrier concentration, mobility, effective mass, multi-valley bands, relaxation time, reduced Fermi energy, phonon modes, scattering parameters, and the number of neighbouring atoms in a given structure. The understanding of these parameters is equally important in order to optimize a high figure of merit (ZT). This article addresses the basics of electronic and thermal transport with the help of Boltzmann transport equation, fundamental concepts for the design of thermoelectric (TE) materials, and implementation of several strategies such as alloying, the phonon-glass electron-crystal (PGEC) approach, band engineering and nanostructuring to optimize the ZT of materials, and finally ends with a discussion of the future prospects of heat extraction through different heat sources.

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“…The wider band gap of Bi 14 Te 13 S 8 compared to Bi 2 Te 3 allows for reduction of the bipolar effect which deteriorates the performance of this compound at temperatures higher than 400 K, − due to a reduction in thermopower. Several efforts have been made to suppress the effect of minority charges in Bi 2 Te 3 -based compounds by tuning the carrier concentration , and widening the band gap. − Record thermoelectric efficiencies have been achieved for Bi 2 Te 3 , alloyed with Sb and Se. , However, the necessity for high-performance materials at temperatures over 500 K persists …”

Section: Introductionmentioning

confidence: 99%

“…Bi 2 Te 3 -based compounds are pioneer thermoelectric materials for room-temperature applications, and many attempts have been made to improve their efficiency over a wide temperature range. Several key strategies that stand out include optimization of the charge carrier concentration; , widening the band gap − to suppress the bipolar effect; enhancing the thermopower and thermal conductivity by alloying Bi 2 Te 3 with Sb − and Se; , nanostructuring to reduce the thermal conductivity; , and utilizing the convergence of electronic bands in alloys to further increase the zT . Significant progress on all fronts has led to record zT values for Bi 2 Te 3 -based compounds.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of Single-Phase n-Type Bi₁₄Te₁₃S₈

Fortulan,

Aminorroaya Yamini,

Juri

et al. 2024

ACS Appl. Electron. Mater.

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Bismuth telluride (Bi 2 Te 3 ) and its alloys are among the best thermoelectric materials at room temperature. Bi 14 Te 13 S 8 , a material with a similar crystal structure, contains sulfur that can potentially improve the thermoelectric performance through widening the band gap and reducing the lattice thermal conductivity. This compound forms in sulfur-added Bi 2 Te 3 alloys. Here, a polycrystalline iodine-doped Bi 14 Te 13 S 8 sample is investigated; an optimum iodine concentration of 1 at. % resulted in the power factor of 3.5 mW 2 •m −1 •K −1 at room temperature. Iodine doping reduced the lattice thermal conductivity by more than 30% by enhancing the phonon scattering. An improved thermoelectric figure of merit zT of ∼0.29 at 520 K was obtained for 1−1.5 at. % iodine-doped Bi 14 Te 13 S 8 . First-principles calculations indicate that Bi 14 Te 13 S 8 has a larger band gap compared to bismuth telluride, which allows for a reduction in the bipolar effect; however, a lower effective mass reduced the thermopower for a similar carrier concentration. This study demonstrates that tuned iodine doping can effectively optimize the thermoelectric performance of Bi 14 Te 13 S 8 , highlighting its contribution in multiphase sulfur-alloyed Bi 2 Te 3 -based materials.

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Distinct role of Sn and Ge doping on thermoelectric properties in p-type (Bi, Sb)2Te3-alloys

Cited by 16 publications

References 51 publications

Advancing Thermoelectric Materials: A Comprehensive Review Exploring the Significance of One-Dimensional Nano Structuring

Advancing Thermoelectric Materials: A Comprehensive Review Exploring the Significance of One-Dimensional Nano Structuring

A Review on Fundamentals, Design and Optimization to High ZT of Thermoelectric Materials for Application to Thermoelectric Technology

Thermoelectric Properties of Single-Phase n-Type Bi₁₄Te₁₃S₈

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Distinct role of Sn and Ge doping on thermoelectric properties in p-type (Bi, Sb)2Te3-alloys

Cited by 16 publications

References 51 publications

Advancing Thermoelectric Materials: A Comprehensive Review Exploring the Significance of One-Dimensional Nano Structuring

Advancing Thermoelectric Materials: A Comprehensive Review Exploring the Significance of One-Dimensional Nano Structuring

A Review on Fundamentals, Design and Optimization to High ZT of Thermoelectric Materials for Application to Thermoelectric Technology

Thermoelectric Properties of Single-Phase n-Type Bi14Te13S8

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Product

Resources

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Thermoelectric Properties of Single-Phase n-Type Bi₁₄Te₁₃S₈