Integrating band engineering with point defect scattering for high thermoelectric performance in Bi2Si2Te6

Chen, Chen; Shen, Dongyi; Xia, Chengliang; Zhang, Zongwei; Wang, Wenxuan; Zhang, Qian; Chen, Yue

doi:10.1016/j.cej.2022.135968

Cited by 27 publications

(25 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The changes in electrical conductivity and Seebeck coefficient with temperature is driven by the carrier mobility and bipolar conduction. Additionally, the TE properties of Bi 2 Si 2 Te 6 NS/PEDOT:PSS composite film according to temperature is similar to that of other TE materials using Bi 2 Si 2 Te 6 . − …”

Section: Resultssupporting

confidence: 67%

“…The crystal structure of the Bi 2 Si 2 Te 6 is shown in Figure b. Thus, the as-fabricated Bi 2 Si 2 Te 6 crystallizes in a rhombohedral crystal structure belonging to the space group R 3̅. − The Bi 2 Si 2 Te 6 slabs are stacked along the c -axis via van der Waals interactions. The slabs consist of the Bi atoms at the center of the BiTe 6 octahedra and the ethane-like Si 2 Te 6 .…”

Section: Resultsmentioning

confidence: 99%

“…Recently, Bi 2 Si 2 Te 6 with a 2D layer structure has been studied as a potential high-performance p-type TE material. − Similar to Sb 2 Si 2 Te 6 , Bi 2 Si 2 Te 6 has a layered rhombohedral crystal structure (space group R 3̅) with three crystallographic positions. − Single crystalline Bi 2 Si 2 Te 6 has been reported to exhibit a large Seebeck coefficient and low lattice thermal conductivity. , However, pristine Bi 2 Si 2 Te 6 is not suitable for flexible TE materials due to the low flexibility of inorganic materials. Hence, in the present study, a design for improving the TE performance is proposed by incorporating Bi 2 Si 2 Te 6 NSs with the PEDOT:PSS conductive polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced Thermoelectric Properties and Flexibility of 2D Bi₂Si₂Te₆ Nanosheets and PEDOT:PSS-Based Thermoelectric Composites

Park

Kim

2023

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

Herein, dimethyl sulfoxide (DMSO)-treated Bi 2 Si 2 Te 6 nanosheet (NS)/poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PE-DOT:PSS) composite films with enhanced thermoelectric (TE) properties and flexibility are prepared. First, the Bi 2 Si 2 Te 6 NSs for use as inorganic fillers are manufactured via a hydrothermal reaction to intercalate lithium, followed by exfoliation. The as-fabricated Bi 2 Si 2 Te 6 NS are then dispersed into the PEDOT:PSS, and Bi 2 Si 2 Te 6 NS/PEDOT:PSS composite films are fabricated via a drop-casting method. The as-synthesized Bi 2 Si 2 Te 6 NS/PEDOT:PSS composite shows an enhanced power factor due to the outstanding electrical conductivity and Seebeck coefficient of the Bi 2 Si 2 Te 6 NSs. Specifically, the composite film with 50 wt % Bi 2 Si 2 Te 6 NSs shows a maximum power factor of ∼140.4 μW/m•K 2 . Furthermore, the electrical conductivity of the Bi 2 Si 2 Te 6 NS/PEDOT:PSS composite was improved via post-synthetic treatment with DMSO. An enhanced power factor of ∼164.1 μW/m•K 2 was reached by using 50 wt % Bi 2 Si 2 Te 6 NS and 5 vol % of DMSO. The asprepared TE composite is expected to provide an important component for flexible organic/inorganic hybrid materials with enhanced TE performance.

show abstract

Section: Resultssupporting

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Thermoelectric Properties and Flexibility of 2D Bi₂Si₂Te₆ Nanosheets and PEDOT:PSS-Based Thermoelectric Composites

Park

Kim

2023

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…Thermoelectric (TE) efficiency is determined by the dimensionless figure of merit (ZT = S 2 σ T /κ, where T is the absolute temperature, S is the Seebeck coefficient, σ is the electrical conductivity, and κ is the total thermal conductivity) . Several strategies have been developed in recent years to improve the ZTs of TE materials, including band engineering, , phonon engineering, − the use of energy-filter effects, , grain boundary engineering, , texture engineering, and entropy engineering, − among others. As a new alloying concept, entropy engineering displays significant potential for delivering high-performance TE materials, with (Sn, Ge, Pb, Mn)Te, − SrTiO 3 , and half-Heusler alloys (HHs) − reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermoelectric Properties of Zr_0.85–xHf_xNb_0.15–yTa_yCoSb Medium-Entropy Alloys: Tradeoff between “What to Alloy” and “How Much to Alloy”

et al. 2023

View full text Add to dashboard Cite

Although configurational entropy is regarded to be a gene-like performance indicator for thermoelectric (TE) materials, increasing the configurational entropy alone does not guarantee a high TE figure of merit (ZT). Therefore, determining protocols for designing medium-and high-entropy TE materials with high ZT values is imperative. Herein, we provide a strategy for designing high ZT n-type ZrCoSb-based medium-entropy (ME) half-Heusler (HH) alloys and highlight the tradeoff between "what to alloy" and "how much to alloy". As expected, an intrinsically low lattice thermal conductivity of ∼2.24 W m −1 K −1 was obtained at 923 K for the Zr 0.45 Hf 0.4 Nb 0.06 Ta 0.09 CoSb ME HH alloy owing to the synergy between Zr-site disorder, anharmonicity, refined grain size, and entropy-driven multiscale defects. Entropy-driven quantum traps lead to energy-filter effects that concurrently provide optimized Seebeck coefficients and power factors. These favorable modifications enable the Zr 0.45 Hf 0.4 Nb 0.06 Ta 0.09 CoSb ME HH alloy to exhibit a high peak ZT of ∼0.57. The developed design concept provides an effective strategy for enhancing the ZT values of medium-and high-entropy TE materials.

show abstract

“…Over the past decades, the enhancement of zT has been done primarily via engineering electronic or thermal properties. In terms of electronic properties, strategies such as band engineering and resonant doping are popular in improving the power factor [13][14][15] . Improvement of thermal properties can be achieved through the suppression of k l using point defect scattering, nano-structuring, and lattice anharmonicity [16][17][18][19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Energy harvesting through thermoelectrics: topological designs and materials jetting technology

2023

Soft Sci

View full text Add to dashboard Cite

The vast amount of waste heat released into the environment, from body heat to factories and boilers, can be exploited for electricity generation. Thermoelectrics is a sustainable clean energy solution that converts a heat flux directly into electrical power and vice versa and therefore has the potential for both energy harvesting and cooling technologies. However, the usage of thermoelectrics for large-scale applications is restrained by its device topologies and energy conversion cost efficiency trade-offs. The increase in complex topological designs reported in literature shows a shift towards customizability and improvement of thermoelectric devices for maximum energy conversion efficiency. Increasing design complexity will require an innovative, cost-effective fabrication method with design freedom capabilities. In light of this, this review paper seeks to summarize various thermoelectric topological designs as well as how 3D Printing technology can be a solution to the fabrication of cost-and performance-efficient thermoelectric devices. Specifically, as a process category of 3D Printing technology, Materials Jetting will be elaborated for its usefulness in the fabrication of thermoelectric devices. With in-depth research in materials jetting of thermoelectrics, the gap between small-scale materials research and scaled-up industry applications for energy harvesting through thermoelectric devices is expected to be bridged.

show abstract

Integrating band engineering with point defect scattering for high thermoelectric performance in Bi2Si2Te6

Cited by 27 publications

References 47 publications

Enhanced Thermoelectric Properties and Flexibility of 2D Bi₂Si₂Te₆ Nanosheets and PEDOT:PSS-Based Thermoelectric Composites

Enhanced Thermoelectric Properties and Flexibility of 2D Bi₂Si₂Te₆ Nanosheets and PEDOT:PSS-Based Thermoelectric Composites

Enhanced Thermoelectric Properties of Zr_0.85–xHf_xNb_0.15–yTa_yCoSb Medium-Entropy Alloys: Tradeoff between “What to Alloy” and “How Much to Alloy”

Energy harvesting through thermoelectrics: topological designs and materials jetting technology

Contact Info

Product

Resources

About

Integrating band engineering with point defect scattering for high thermoelectric performance in Bi2Si2Te6

Cited by 27 publications

References 47 publications

Enhanced Thermoelectric Properties and Flexibility of 2D Bi2Si2Te6 Nanosheets and PEDOT:PSS-Based Thermoelectric Composites

Enhanced Thermoelectric Properties and Flexibility of 2D Bi2Si2Te6 Nanosheets and PEDOT:PSS-Based Thermoelectric Composites

Enhanced Thermoelectric Properties of Zr0.85–xHfxNb0.15–yTayCoSb Medium-Entropy Alloys: Tradeoff between “What to Alloy” and “How Much to Alloy”

Energy harvesting through thermoelectrics: topological designs and materials jetting technology

Contact Info

Product

Resources

About

Enhanced Thermoelectric Properties and Flexibility of 2D Bi₂Si₂Te₆ Nanosheets and PEDOT:PSS-Based Thermoelectric Composites

Enhanced Thermoelectric Properties and Flexibility of 2D Bi₂Si₂Te₆ Nanosheets and PEDOT:PSS-Based Thermoelectric Composites

Enhanced Thermoelectric Properties of Zr_0.85–xHf_xNb_0.15–yTa_yCoSb Medium-Entropy Alloys: Tradeoff between “What to Alloy” and “How Much to Alloy”