Enhancement in thermoelectric properties of Te-embedded Bi2Te3 by preferential phonon scattering in heterostructure interface

Choi, Hyejin; Jeong, Kwangsik; Chae, Jimin; Park, Hanbum; Baeck, Ju-Heyuck; Kim, Tae Hyeon; Song, Jae Yong; Park, Jaehun; Jeong, Kwang-Hwa; Cho, Mann Ho

doi:10.1016/j.nanoen.2018.03.009

Cited by 107 publications

(57 citation statements)

References 61 publications

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“…Recently, Bi 2 Te 3 /Te heterostructure by PVD or Sb 2 Te 3 /Te heterostructure by solution synthesized were prepared to further enhance the TE properties. In these structures, PF was enhanced by filtering low energy carrier, and thermal conductivity was reduced by enhancing phonon scattering …”

Section: Introductionmentioning

confidence: 99%

Lattice Strain Enhances Thermoelectric Properties in Sb₂Te₃/Te Heterostructure

Chen

et al. 2019

Adv Elect Materials

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κ, κ e , κ L , and T are the Seebeck coefficient, electrical conductivity, total thermal conductivity, electrical thermal conductivity, lattice thermal conductivity, and absolute working temperature, respectively. [1,2] Since α, σ, and κ are strongly coupled with each other, a simple improvement in single parameter usually results in a deterioration of the others. The challenge of realizing superior TE properties lies in the improvement of ZT, that is, simultaneously increasing in power factor (PF = α 2 σ) and suppressing κ. Normally, α enhancement can be achieved by a carrier energy filtering effect, caused by band bending at the nanointerfaces between nanoparticle and TE host materials. [2-4] Meanwhile, reducing κ L by phonon scattering is an effective way to reduce κ while maintaining a high σ. Very recently, lattice strains regulated by annealing time have also been observed for remarkably decreasing κ without affecting the carrier mobility (µ). [3] Sb 2 Te 3 and its derivatives are considered to be one of the best p-type TE materials near room temperature. [5] Compared with its bulk counterparts, nanostructured Sb 2 Te 3 film provides promising possibilities for enhanced TE properties and potential applications in micro/nanoelectromechanical systems (MEMS/NEMS) TE device. [6] Experimentally, Sb 2 Te 3 has been prepared by various approaches such as physical vapor deposition (PVD), solid state reaction, and chemical synthesis method and so on. [1,7,8] The effect of substrate, annealing temperature, and thickness on PF as well as the strain-and grain size-dependent κ in Sb 2 Te 3 films was studied. [9-11] PF can be enhanced by introducing nanoscale metal/semimetals into

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Section: Introductionmentioning

confidence: 99%

Lattice Strain Enhances Thermoelectric Properties in Sb₂Te₃/Te Heterostructure

Chen

et al. 2019

Adv Elect Materials

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“…State‐of‐the‐art inorganic TE materials showing remarkable breakthroughs such as a) highest S , b) reduced κ t , and c) enhanced ZT via miscellaneous optimization techniques. Bi 0.5 Sb 1.5 Te 3 , [ 63 ] Bi 0.4 Sb 1.6 Te 3.4 , [ 64 ] Te‐Bi 2 Te 3 thin film, [ 65 ] In 0.25 Ce 0.2 Co 4 Sb 12 , [ 66 ] Bi 2 Te 3– x Se x , [ 67 ] (GeTe) 1– x (Bi 2 Te 3 ) x alloy, [ 68 ] Mg 3.1 Co 0.1 Sb 1.5 Bi 0.49 Te 0.01 , [ 69 ] Mg 3.02 Y 0.02 Sb 1.5 Bi 0.5 , [ 70 ] Mg 3.15 Mn 0.05 Sb 1.5 Bi 0.49 Te 0.01 , [ 60 ] Pb 0.94 x Mn x Na 0.02 Sr 0.04 Te, [ 71 ] (PbTe) 0.75 (PbSe) 0.20 (PbS) 0.05 , [ 72 ] Ba 0.1 Yb 0.2 In 0.25 Co 4 Sb 12 , [ 73 ] Ba 0.14 In 0.23 Co 4 Sb 12 , [ 74 ] Na‐doped PbTe–PbSe, [ 75 ] PbBi 0.002 Te/Ag 2 Te, [ 76 ] Pb 0.97 Na 0.03 Te/Ba 0.5 Ca 0.5 Te, [ 77 ] Ba 0.08 La 0.05 Yb 0.04 Co 4 Sb 12 , [ 74 ] Bi 0.88 Ba 0.06 Pb 0.06 CuSeO, [ 78 ] BiCuSeO, [ 79 ] PbTe 1– x Se x /Na/SrTe, [ 80 ] K‐doped PbTe 0.7 S 0.3, [ 81 ] Pb 0.98 Na 0.02 Te/SrTe, [ 82 ] Si 80 Ge 20 , [ 83 ] and SiGe/YSi 2 . [ 84 ] …”

Section: Overview Of Energy Harvestersmentioning

confidence: 99%

Energy Harvesters for Wearable Electronics and Biomedical Devices

Hasan

Sahlan

Osman

et al. 2021

Adv Materials Technologies

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Energy harvesters (EHs) are widely used to transform ambient energy sources into electrical energy, and have tremendous potential to power wearables electronics and biomedical devices by eliminating, or at least increasing, the battery life. Nevertheless, the use of EHs for a specific application depends on various aspects including the form of energy source, the structural configuration of the device, and the properties of materials. This paper presents a comprehensive review of the classification of EHs, notably thermoelectric generators (TEGs), triboelectric nanogenerators (TENGs), and piezoelectric generators (PEGs) that allows a wide variety of devices to be operated. The EHs are discussed in terms of their operating principles, optimization factors, state‐of‐the‐art materials, and device structure, that directly influence their operational efficiency. Besides, the breakthrough performance of each of the EHs listed above is highlighted. From the review and analysis, the maximum output power density of 9.2 mW cm−2, 50 mW cm−2, and 64.9 µW cm−2, respectively, are obtained from the TEG, TENG, and PEG, respectively. Furthermore, recent applications relevant to a specific EH and their output performance, are also enlightened. Eventually, the essential outcomes and future direction from this review are discussed and encapsulated.

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“…Emerging Bi 2 Te 3 alloys highlighting (A) ultra‐low κ t and (B) enhanced ZT value at different temperature range …”

Section: High Performance Inorganic Te Materialsmentioning

confidence: 99%

Inorganic thermoelectric materials: A review

et al. 2020

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Summary Thermoelectric generator, which converts heat into electrical energy, has great potential to power portable devices. Nevertheless, the efficiency of a thermoelectric generator suffers due to inefficient thermoelectric material performance. In the last two decades, the performance of inorganic thermoelectric materials has been significantly advanced through rigorous efforts and novel techniques. In this review, major issues and recent advancements that are associated with the efficiency of inorganic thermoelectric materials are encapsulated. In addition, miscellaneous optimization strategies, such as band engineering, energy filtering, modulation doping, and low dimensional materials to improve the performance of inorganic thermoelectric materials are reported. The methodological reviews and analyses showed that all these techniques have significantly enhanced the Seebeck coefficient, electrical conductivity, and reduced the thermal conductivity, consequently, improved ZT value to 2.42, 2.6, and 1.85 for near‐room, medium, and high temperature inorganic thermoelectric material, respectively. Moreover, this review also focuses on the performance of silicon nanowires and their common fabrication techniques, which have the potential for thermoelectric power generation. Finally, the key outcomes along with future directions from this review are discussed at the end of this article.

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Enhancement in thermoelectric properties of Te-embedded Bi2Te3 by preferential phonon scattering in heterostructure interface

Cited by 107 publications

References 61 publications

Lattice Strain Enhances Thermoelectric Properties in Sb₂Te₃/Te Heterostructure

Lattice Strain Enhances Thermoelectric Properties in Sb₂Te₃/Te Heterostructure

Energy Harvesters for Wearable Electronics and Biomedical Devices

Inorganic thermoelectric materials: A review

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Enhancement in thermoelectric properties of Te-embedded Bi2Te3 by preferential phonon scattering in heterostructure interface

Cited by 107 publications

References 61 publications

Lattice Strain Enhances Thermoelectric Properties in Sb2Te3/Te Heterostructure

Lattice Strain Enhances Thermoelectric Properties in Sb2Te3/Te Heterostructure

Energy Harvesters for Wearable Electronics and Biomedical Devices

Inorganic thermoelectric materials: A review

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Lattice Strain Enhances Thermoelectric Properties in Sb₂Te₃/Te Heterostructure

Lattice Strain Enhances Thermoelectric Properties in Sb₂Te₃/Te Heterostructure