Thermoelectric characteristics of the p-type (Bi0.2Sb0.8)2Te3 nanocomposites processed with SbTe nanowire dispersion

Kim, Minyoung; Yu, Byung-Kyu; Oh, Tae-Sung

doi:10.1007/s13391-012-1099-x

Cited by 16 publications

(8 citation statements)

References 15 publications

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“…[75,76,[79][80][81] Very recently,these drawbacks have been overcome partly;w ed eveloped as urfactant-free scalable synthesis method for Bi 2 Te 3 and Bi 2 Se 3 nanoflakes. [66] High-energy BM is also used to prepare nanoinclusionc omposites; [54][55][56][57][58][59][60][61][62] however, it is difficult to obtain an appropriate microstructuref or effective phase boundary engineering by as imple mixing process. [78] 3.2.…”

Section: Bottom-up Methodsmentioning

confidence: 99%

“…Although it is very difficult to achieves ize control,t hat is, an arrow size distribution, meltedB i 2 Te 3 -based ingots can be simply ground into nanoscale powders. [66] High-energy BM is also used to prepare nanoinclusionc omposites; [54][55][56][57][58][59][60][61][62] however, it is difficult to obtain an appropriate microstructuref or effective phase boundary engineering by as imple mixing process. Thus, we developed the combined technique of high-energy BM and nanometal decoration to obtain mixed powders with au niform distribution of metal nanoparticles.…”

Section: Top-down Methodsmentioning

confidence: 99%

“…The k lat values, which ranged from 0.4-0.55 Wm À1 K À1 ,a re much higher than those of the nanograined bulks (Table 1) because of the low boundary density and the agglomeration of nanoinclusions, which thus limits the enhancement of the zT valuest o1 .33 at 348 K. [60] These results indicates trongly that an ew approach to introduce (semi)coherentn anoinclusions uniformly in am atrix is urgent for bulk Bi 2 Te 3 -based alloys.…”

Section: Phase Boundarye Ngineeringmentioning

confidence: 99%

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Boundary Engineering for the Thermoelectric Performance of Bulk Alloys Based on Bismuth Telluride

et al. 2015

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Thermoelectrics, which transports heat for refrigeration or converts heat into electricity directly, is a key technology for renewable energy harvesting and solid-state refrigeration. Despite its importance, the widespread use of thermoelectric devices is constrained because of the low efficiency of thermoelectric bulk alloys. However, boundary engineering has been demonstrated as one of the most effective ways to enhance the thermoelectric performance of conventional thermoelectric materials such as Bi2 Te3 , PbTe, and SiGe alloys because their thermal and electronic transport properties can be manipulated separately by this approach. We review our recent progress on the enhancement of the thermoelectric figure of merit through boundary engineering together with the processing technologies for boundary engineering developed most recently using Bi2 Te3 -based bulk alloys. A brief discussion of the principles and current status of boundary-engineered bulk alloys for the enhancement of the thermoelectric figure of merit is presented. We focus mainly on (1) the reduction of the thermal conductivity by grain boundary engineering and (2) the reduction of thermal conductivity without deterioration of the electrical conductivity by phase boundary engineering. We also discuss the next potential approach using two boundary engineering strategies for a breakthrough in the area of bulk thermoelectric alloys.

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Section: Bottom-up Methodsmentioning

confidence: 99%

Section: Top-down Methodsmentioning

confidence: 99%

Section: Phase Boundarye Ngineeringmentioning

confidence: 99%

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Boundary Engineering for the Thermoelectric Performance of Bulk Alloys Based on Bismuth Telluride

et al. 2015

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“…This maximum ZT value is optimised in comparison to the ZT values of synthesized Bi 2 Te 3 -based materials with nanostructures or without synthesis pressure. 25,27,29,30…”

Section: Resultsmentioning

confidence: 99%

Thermoelectric transport properties and crystal growth of BiSbTe3 bulk materials produced by a unique high-pressure synthesis

et al. 2013

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“…The second is the formation of nanoinclusion composite. Phase boundaries between TE material matrix and introduced nanoinclusions can act as effective phonon scattering centers; however, nanoinclusions through this approach limit enhancement up to ∼20% so far mainly due to the difficulty of controlling the size and distribution of nanoinclusions [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Formation of Dense Pore Structure by Te Addition in Bi_0.5Sb_1.5Te₃: An Approach to Minimize Lattice Thermal Conductivity

Hasan

Mun

Kim

et al. 2013

Journal of Nanomaterials

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We herein report the electronic and thermal transport properties of p-type Bi0.5Sb1.5Te3polycrystalline bulks with dense pore structure. Dense pore structure was fabricated by vaporization of residual Te during the pressureless annealing of spark plasma sintered bulks of Te coated Bi0.5Sb1.5Te3powders. The lattice thermal conductivity was effectively reduced to the value of 0.35 W m−1 K−1at 300 K mainly due to the phonon scattering by pores, while the power factor was not significantly affected. An enhancedZTof 1.24 at 300 K was obtained in spark plasma sintered and annealed bulks of 3 wt.% Te coated Bi0.5Sb1.5Te3by these synergetic effects.

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Thermoelectric characteristics of the p-type (Bi0.2Sb0.8)2Te3 nanocomposites processed with SbTe nanowire dispersion

Cited by 16 publications

References 15 publications

Boundary Engineering for the Thermoelectric Performance of Bulk Alloys Based on Bismuth Telluride

Boundary Engineering for the Thermoelectric Performance of Bulk Alloys Based on Bismuth Telluride

Thermoelectric transport properties and crystal growth of BiSbTe3 bulk materials produced by a unique high-pressure synthesis

Formation of Dense Pore Structure by Te Addition in Bi_0.5Sb_1.5Te₃: An Approach to Minimize Lattice Thermal Conductivity

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Thermoelectric characteristics of the p-type (Bi0.2Sb0.8)2Te3 nanocomposites processed with SbTe nanowire dispersion

Cited by 16 publications

References 15 publications

Boundary Engineering for the Thermoelectric Performance of Bulk Alloys Based on Bismuth Telluride

Boundary Engineering for the Thermoelectric Performance of Bulk Alloys Based on Bismuth Telluride

Thermoelectric transport properties and crystal growth of BiSbTe3 bulk materials produced by a unique high-pressure synthesis

Formation of Dense Pore Structure by Te Addition in Bi0.5Sb1.5Te3: An Approach to Minimize Lattice Thermal Conductivity

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Product

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Formation of Dense Pore Structure by Te Addition in Bi_0.5Sb_1.5Te₃: An Approach to Minimize Lattice Thermal Conductivity