Limited grain growth in multilayered Bi/Te thin films and the influence on the thermal and electrical conductivity

Liu, S.; Liu, F.; Zhu, Xinyuan; Bai, Yu; Ma, Da-Yan; Xu, Ke

doi:10.1016/j.vacuum.2016.02.013

Cited by 3 publications

(3 citation statements)

References 49 publications

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“…A similar increase in the intensity of XRD peaks due to improved crystallinity owing to annealing was also observed. [51][52][53] Figure 7 46 As shown in Table II, the crystallite size also increased upon annealing from 47.01 nm (NA) to 62.89 nm (450 °C). When annealed, the increase in D results from the agglomeration and enlargement of Bi 2 Te 3 grains.…”

Section: Resultsmentioning

confidence: 88%

Impacts of Annealing Temperature and Time on the Thermoelectric Performance of Recycled Carbon Fiber (RCF)/n-Bi₂Te₃ Heterostructure Thermoelectric Composites

Jagadish¹,

Khalid²,

Wong³

et al. 2023

ECS J. Solid State Sci. Technol.

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Recycling carbon fibre waste is crucial for sustainability in the composites industry. Herein, we report the fabrication of a heterostructure composite using recycled carbon fiber (RCF) and n-type bismuth telluride (n-Bi2Te3) for thermoelectric applications. In the present study, we have comprehensively investigated the effects of annealing temperature and time on the thermoelectric, structural, charge carrier transport, morphological, and thermal stability properties of annealed RCF/n-Bi2Te3 composites. The optimum annealing temperature and time were at 350°C and 2 hours, respectively, which yielded a maximum power factor of 7.83 µWK-2m-1. Annealing redistributed the bismuth and tellurium atomic percentage, decreased carrier concentration, improved carrier mobility, enhanced the crystallinity and increased the grain size of the bismuth telluride particles, subsequently improving the thermoelectric performance as well as the thermal stability of annealed RCF/n-Bi2Te3 composites. In addition, this study has explored the plausibility of a cross-plane configured Seebeck coefficient measurement utilizing recycled carbon fibre/n-type bismuth telluride heterostructure thermoelectric composite. Energy band diagram analysis indicated favorable heterojunction alignment between RCF and n-Bi2Te3, validating the viability of the thermoelectric composite in a cross-plane configuration. Our study provides a promising route for closing the recycling loop of carbon fiber waste and achieving sustainable thermoelectric materials.

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Section: Resultsmentioning

confidence: 88%

Impacts of Annealing Temperature and Time on the Thermoelectric Performance of Recycled Carbon Fiber (RCF)/n-Bi₂Te₃ Heterostructure Thermoelectric Composites

Jagadish¹,

Khalid²,

Wong³

et al. 2023

ECS J. Solid State Sci. Technol.

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“…In Figure 1a, the as-deposited Bi 2 Te 3 /Sb thin film show diffraction peaks corresponding to rhombohedral Bi 2 Te 3 (JCPDS NO. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. This indicates the formation of nano crystallites of Bi 2 Te 3 in the thin film at room temperature.…”

Section: Microstructure Of Bi 2 Te 3 /Sb and Bi 2 Te 3 /W Multilayersmentioning

confidence: 99%

“…At the same time, the high interface density can also reduce thermal conductivity effectively, thus improving the overall TE properties. [ 20 ] Thus, this article proposes the integration of W and Sb layers with Bi 2 Te 3 layers in the form of Bi 2 Te 3 /Sb and Bi 2 Te 3 /W multilayer structures for combining their own advantages. Multilayer TE thin films commonly exhibit better TE properties than conventional TE materials due to the existence of interface optimization and band engineering within the films to refine the carrier transportation.…”

Section: Introductionmentioning

confidence: 99%

Boosting Thermoelectric Performance of Bi₂Te₃ Material by Microstructure Engineering

Wang,

Meng,

Chen

et al. 2023

Advanced Science

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Due to the intrinsic contradiction of electrical conductivity and Seebeck coefficient in thermoelectric materials, the enhancement for the power factor (PF) is limited. Since the PF decides the output power, strategies to the enhancement of PF are of paramount importance. In this work, Bi2Te3/Sb and Bi2Te3/W multilayer films are proposed to enhance the thermoelectric properties. Both systems possess extremely high conductivity of ≈5.6 × 105 S m−1. Moreover, the electrical conductivity and Seebeck coefficient simultaneously increase as temperature rising, showing the overcome of the intrinsic contradiction. This results in ultrahigh PFs of 1785 µWm−1 K−2 for Bi2Te3/W and of 1566 µWm−1 K−2 for Bi2Te3/Sb at 600 K. Thermal heating of the Bi2Te3/Sb multilayer system shows compositional changes with subsequent formation of Bi‐Te‐Sb phases, Sb‐rich Bi‐Te precipitates, and cavities. Contrary, the multilayer structure of the Bi2Te3/W films is maintained, while Bi2Te3 grains of high‐crystalline quality are confined between the W layers. In addition, bilayer defects in Bi2Te3 and smaller cavities at the interface to W layers are also observed. Thus, compositional and confinement effects as well as structural defects result in the ultrahigh PF. Overall, this work demonstrates the strategies on how to obtain ultrahigh PFs of commercial Bi2Te3 material by microstructure engineering using multilayer structures.

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Investigation on the interfacial stability of multilayered Cu–W films at elevated deposition temperatures during co-sputtering

Xue

Lei

et al. 2019

Vacuum

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Limited grain growth in multilayered Bi/Te thin films and the influence on the thermal and electrical conductivity

Cited by 3 publications

References 49 publications

Impacts of Annealing Temperature and Time on the Thermoelectric Performance of Recycled Carbon Fiber (RCF)/n-Bi₂Te₃ Heterostructure Thermoelectric Composites

Impacts of Annealing Temperature and Time on the Thermoelectric Performance of Recycled Carbon Fiber (RCF)/n-Bi₂Te₃ Heterostructure Thermoelectric Composites

Boosting Thermoelectric Performance of Bi₂Te₃ Material by Microstructure Engineering

Investigation on the interfacial stability of multilayered Cu–W films at elevated deposition temperatures during co-sputtering

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Limited grain growth in multilayered Bi/Te thin films and the influence on the thermal and electrical conductivity

Cited by 3 publications

References 49 publications

Impacts of Annealing Temperature and Time on the Thermoelectric Performance of Recycled Carbon Fiber (RCF)/n-Bi2Te3 Heterostructure Thermoelectric Composites

Impacts of Annealing Temperature and Time on the Thermoelectric Performance of Recycled Carbon Fiber (RCF)/n-Bi2Te3 Heterostructure Thermoelectric Composites

Boosting Thermoelectric Performance of Bi2Te3 Material by Microstructure Engineering

Investigation on the interfacial stability of multilayered Cu–W films at elevated deposition temperatures during co-sputtering

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Product

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Impacts of Annealing Temperature and Time on the Thermoelectric Performance of Recycled Carbon Fiber (RCF)/n-Bi₂Te₃ Heterostructure Thermoelectric Composites

Impacts of Annealing Temperature and Time on the Thermoelectric Performance of Recycled Carbon Fiber (RCF)/n-Bi₂Te₃ Heterostructure Thermoelectric Composites

Boosting Thermoelectric Performance of Bi₂Te₃ Material by Microstructure Engineering