Enhanced thermoelectric figure of merit in p-type Bi0.48Sb1.52Te3 alloy with WSe2 addition

Xiao, Yukun; Chen, Guoxin; H, Qin; Wu, Menglei; Xiao, Zhepeng; Jiang, Jun; Xu, Jingtao; Jiang, Haochuan; Xu, Gaojie

doi:10.1039/c4ta01554a

Cited by 51 publications

(36 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 Among numerous thermoelectric materials, bismuth telluride (Bi 2 Te 3 )based ingots are the most well-established thermoelectric materials at room temperature and almost dominate the industry at present, 3,4 because of the increasing demand for electronic cooling and thermoelectric power generation for low-temperature waste heat. 2 Among numerous thermoelectric materials, bismuth telluride (Bi 2 Te 3 )based ingots are the most well-established thermoelectric materials at room temperature and almost dominate the industry at present, 3,4 because of the increasing demand for electronic cooling and thermoelectric power generation for low-temperature waste heat.…”

Section: Introductionmentioning

confidence: 99%

Electrical and thermal transport properties of spark plasma sintered n-type Bi₂Te_3−xSe_x alloys: the combined effect of point defect and Se content

et al. 2015

View full text Add to dashboard Cite

Performance enhancement can be realized in p-type Bi 2 Te 3 but hardly in n-type Se-modified Bi 2 Te 3 alloys fabricated by powder processing as compared with conventional ingots. To reveal the reasons and investigate the optimal Se content in fine-grained n-type Bi 2 Te 3Àx Se x materials processed by mechanical alloying (MA) and spark plasma sintering (SPS), the amount of Se was varied in a wide range and electrical transport properties were investigated and discussed in association with the results of Hall measurements. Thermal transport properties were also studied with Raman spectra. It is revealed that different concentrations of point defects are induced by changing the Se content x from 0 to 1.0 in Bi 2 Te 3Àx Se x . The point defects and their interaction (including donor-like effects) not only largely change the carrier concentration and mobility, but also enhance the phonon scattering that would lead to a decrease of thermal conductivity. Consequently, the optimal composition is confirmed as Bi 2 Te 2.2 Se 0.8 with a corresponding carrier concentration of 4.5 Â 10 19 cm À3 and a maximum ZT value of 0.82 at 473 K, approximately 35% increased than that obtained at optimal Bi 2 Te 2.7 Se 0.3 conventionally used for ingots. This work indicates that the point defects as well as their interaction during MA and SPS shift the optimal Se content from traditional x = 0.3 to x = 0.8 in n-type Bi 2 Te 3Àx Se x , demonstrating the importance of comprehensive control of point defects by adjusting the Se content for different processes.

show abstract

Section: Introductionmentioning

confidence: 99%

Electrical and thermal transport properties of spark plasma sintered n-type Bi₂Te_3−xSe_x alloys: the combined effect of point defect and Se content

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The BiSbTe matrix shows typical electrical conductivity of 1.0 × 10 5 S/m at room temperature. This value is slightly smaller than those of samples prepared by zone melting [16,17,27,33], but higher than those of samples prepared by SPS [28]. After introducing additional graphene, the electrical conductivity slightly enhances for x = 0.05, and then decreases with further increasing graphene content.…”

Section: Resultsmentioning

confidence: 68%

“…Nanocomposite has been suggested to be an effective approach to synergistically tune the electrical and the thermal properties by introducing second phase nanoparticles into the matrix [12][13][14][15][16][17][18]. Lots of materials, such as ZnAlO, WSe 2 and silver, have been used as second phase nanoparticles to enhance the TE performance of Bi 2 Te 3 -based alloys [16][17][18][19]. Not all composites show synergistic optimization…”

Section: Introductionmentioning

confidence: 99%

Synergistic Optimization of Thermoelectric Performance in P-Type Bi0.48Sb1.52Te3/Graphene Composite

Xie

Liu

et al. 2016

Energies

Self Cite

View full text Add to dashboard Cite

We report the synergistic optimization of the thermoelectric properties in p-type Bi 0.48 Sb 1.52 Te 3 by the additional graphene. Highly dense Bi 0.48 Sb 1.52 Te 3 + graphene (x wt%, x = 0, 0.05, 0.1 and 0.15) composites have been synthesized by zone-melting followed by spark plasma sintering. With the help of scanning electron microscopy, the graphene has been clearly observed at the edge of the grain in the composites. Due to the additional graphene, the composites show an improved power factor of 4.8ˆ10´3 Wm´1K´2 with modified carrier concentration and suppressed lattice thermal conductivity. Consequently, synergistic optimization in electrical and lattice properties by additional graphene leads to a great improvement in the figure of merit ZT (1.25 at 320 K).Energies 2016, 9, 236 2 of 9 in TE performance, and some composites show decrease in the electrical properties [12,15,18,19]. Therefore, it is essential to select a proper second phase for Bi 2 Te 3 -based alloys.Graphene has very high electrical conductivity, and has been explored to be an incorporated second phase in conventional thermoelectric materials, such as PbTe, CoSb 3 , etc., to increase electrical conductivity [20][21][22][23]. In spite of the high intrinsic κ lat of graphene, some composites have been reported to exhibit lower κ lat than that of the matrix, which may be due to the boundary scattering and great atom mass differences between the matrix and graphene.For Bi 2 Te 3 based materials, researchers have tried to optimize the TE performance with graphene [24][25][26][27][28]. A.H. Li et al. reported an enhanced ZT of~0.45 at room temperature in graphene doped n-type Bi 2 Te 3 [24]. Similar results were also reported by B.B. Liang et al. [25] and J.I. Kim et al. [26]. T. Zhang, et al. has tried to synthesize p-type graphene-BiSbTe composites by zone melting [27]. Even though a small enhancement in TE performance was achieved, they found some Te particles rather than graphene to be a second phase in the composite [27]. Recently, D. Suh et al. reported graphene-BiSbTe composites synthesized from nanoplates through the solvothermal method [28]. A promising ZT of 1.24 was obtained in spite of low relative densities of 93~95% which may lead to poor mechanical properties [28].As Bi 2 Te 3 based materials and graphene are all layered structures, the microstructure of graphene and matrix are very important to the overall TE performance. In this work, we have prepared the BiSbTe alloys with additional graphene using zone melting with the spark plasma sintering (SPS). We have clearly observed the graphene in the composites, which is in the BiSbTe grain boundaries and at the edge of BiSbTe grains. This graphene shows synergistic effects to enhance the power factor and overall figure of merit ZT.

show abstract

“…14 Recently, G. J. Tan et al reported that Sn self-compensation can effectively reduce the Sn vacancies and decrease the hole carrier density. 19,20 The obtained samples show enhanced power factors (S 2 s) with a maximum value of 30.5 mW cm À1 K À2 at 823 K, which is the highest reported value in the SnTe alloys so far. With further modication of the band structure by Cd, Hg, or Mg alloying in SnTe, the Seebeck coefficient of SnTe is greatly enhanced and the maximum ZT value is larger than 1.2 above 860 K. 11,[15][16][17] A recent theoretical study has shown that the high p-type carrier concentration in SnTe is dominated by the intrinsic negatively charged Sn vacancy (V Sn 2À ), which always has a negative formation energy regardless of the growth condition, and alloying with Pb can inhibit the formation of cation vacancy.…”

Section: Introductionmentioning

confidence: 72%

Enhanced power factor in the promising thermoelectric material SnPb_xTe prepared via zone-melting

Liu

et al. 2015

RSC Adv.

Self Cite

View full text Add to dashboard Cite

Tin telluride (SnTe) has recently attracted much attention as a promising thermoelectric material. In this work, SnTe is alloyed with additional Pb, and the high density crystalline ingots of SnPb x Te (x ¼ 0, 0.02, 0.04, and 0.06) have been synthesized by a zone-melting method. Through this method, SnPb x Te samples show larger power factors than those prepared by other methods, and a maximum value of 30.5 mW cm À1 K À2 at 823 K has been reached in p-type SnPb 0.02 Te, which is the highest value reported so far. As a result, a promising figure of merit ZT of $0.81 has been obtained at 823 K.

show abstract

Enhanced thermoelectric figure of merit in p-type Bi0.48Sb1.52Te3 alloy with WSe2 addition

Cited by 51 publications

References 29 publications

Electrical and thermal transport properties of spark plasma sintered n-type Bi₂Te_3−xSe_x alloys: the combined effect of point defect and Se content

Electrical and thermal transport properties of spark plasma sintered n-type Bi₂Te_3−xSe_x alloys: the combined effect of point defect and Se content

Synergistic Optimization of Thermoelectric Performance in P-Type Bi0.48Sb1.52Te3/Graphene Composite

Enhanced power factor in the promising thermoelectric material SnPb_xTe prepared via zone-melting

Contact Info

Product

Resources

About

Enhanced thermoelectric figure of merit in p-type Bi0.48Sb1.52Te3 alloy with WSe2 addition

Cited by 51 publications

References 29 publications

Electrical and thermal transport properties of spark plasma sintered n-type Bi2Te3−xSex alloys: the combined effect of point defect and Se content

Electrical and thermal transport properties of spark plasma sintered n-type Bi2Te3−xSex alloys: the combined effect of point defect and Se content

Synergistic Optimization of Thermoelectric Performance in P-Type Bi0.48Sb1.52Te3/Graphene Composite

Enhanced power factor in the promising thermoelectric material SnPbxTe prepared via zone-melting

Contact Info

Product

Resources

About

Electrical and thermal transport properties of spark plasma sintered n-type Bi₂Te_3−xSe_x alloys: the combined effect of point defect and Se content

Electrical and thermal transport properties of spark plasma sintered n-type Bi₂Te_3−xSe_x alloys: the combined effect of point defect and Se content

Enhanced power factor in the promising thermoelectric material SnPb_xTe prepared via zone-melting