Simultaneous improvement of power factor and thermal conductivity via Ag doping in p-type Mg3Sb2 thermoelectric materials

As a thermoelectric material, p-type CuSbSe2 has attracted much attention due to its intrinsic low thermal conductivity and environment-friendly constituents. In this work, Sb deficient compounds CuSb1-xSe2 (x=0-0.12) are prepared...

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Doping Studies of n-Type CsBi4Te6 Thermoelectric Materials

MRS Proceedings ◽

10.1557/proc-626-z7.5 ◽

2000 ◽

Vol 626 ◽

Author(s):

Melissa A. Lane ◽

John R. Ireland ◽

Paul W. Brazis ◽

Theodora Kyratsi ◽

Duck-Young Chung ◽

...

Keyword(s):

Power Factor ◽

Thermoelectric Materials ◽

Figure Of Merit ◽

Doping Concentration ◽

High Figure ◽

P Type ◽

Optimum Doping Concentration

ABSTRACTWe have previously reported the successful p-type doping of CsBi4Te6 which had a high figure of merit at temperatures below 300 K. In this study, several dopants were explored to make n-type CsBi4Te6. A program of measurements was performed to identify the optimum doping concentration for several series of dopants. The highest power factors occurred around 125 K for the 0.5% Sn doped CsBi4Te6 sample which had a power factor of 21.9 μW/cm•K2 and 1.0% Te doped CsBi4Te6 which had a power factor of 21.7 μW/cm•K2.

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Investigation of Thermoelectric Materials: Substitution effect of Bi on the Ag1-xPb18MTe20 (M = Sb, Bi) (x = 0, 0.14, 0.3)

MRS Proceedings ◽

10.1557/proc-1044-u03-14 ◽

2007 ◽

Vol 1044 ◽

Author(s):

Mi-kyung Han ◽

Huijun Kong ◽

Ctirad Uher ◽

Mercouri G Kanatzidis

Keyword(s):

Thermal Conductivity ◽

Electrical Conductivity ◽

Seebeck Coefficient ◽

Thermoelectric Materials ◽

Figure Of Merit ◽

Lattice Thermal Conductivity ◽

Substitution Effect ◽

Dimensionless Figure Of Merit ◽

The Matrix ◽

Mass Fluctuation

AbstractWe performed comparative investigations of the Ag1-xPb18MTe20 (M = Bi, Sb) (x = 0, 0.14, 0.3) system to better understand the roles of Sb and Bi on the thermoelectric properties. In both systems, the electrical conductivity nearly keeps the same values, while the Seebeck coefficient decreases dramatically in going from Sb to Bi. Compared to the lattice thermal conductivity of PbTe, that of AgPb18BiTe20 is substantially reduced. The lattice thermal conductivity of the Bi analog, however, is higher than that of AgPb18SbTe20 and this is attributed largely to the decrease in the degree of mass fluctuation between the nanostructures and the matrix (for the Bi analog). As a result the dimensionless figure of merit ZT of Ag1-xPb18MTe20 (M = Bi) is found to be smaller than that of Ag1-xPb18MTe20 (M = Sb).

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Thermoelectric Materials for Textile Applications

Molecules ◽

10.3390/molecules26113154 ◽

2021 ◽

Vol 26 (11) ◽

pp. 3154

Author(s):

Kony Chatterjee ◽

Tushar K. Ghosh

Keyword(s):

Thermal Conductivity ◽

Carbon Nanotubes ◽

Seebeck Coefficient ◽

Thermoelectric Materials ◽

Figure Of Merit ◽

Inorganic Materials ◽

Peltier Effect ◽

Electronic Textiles ◽

Heating And Cooling ◽

Recent Attention

Since prehistoric times, textiles have served an important role–providing necessary protection and comfort. Recently, the rise of electronic textiles (e-textiles) as part of the larger efforts to develop smart textiles, has paved the way for enhancing textile functionalities including sensing, energy harvesting, and active heating and cooling. Recent attention has focused on the integration of thermoelectric (TE) functionalities into textiles—making fabrics capable of either converting body heating into electricity (Seebeck effect) or conversely using electricity to provide next-to-skin heating/cooling (Peltier effect). Various TE materials have been explored, classified broadly into (i) inorganic, (ii) organic, and (iii) hybrid organic-inorganic. TE figure-of-merit (ZT) is commonly used to correlate Seebeck coefficient, electrical and thermal conductivity. For textiles, it is important to think of appropriate materials not just in terms of ZT, but also whether they are flexible, conformable, and easily processable. Commercial TEs usually compromise rigid, sometimes toxic, inorganic materials such as bismuth and lead. For textiles, organic and hybrid TE materials are more appropriate. Carbon-based TE materials have been especially attractive since graphene and carbon nanotubes have excellent transport properties with easy modifications to create TE materials with high ZT and textile compatibility. This review focuses on flexible TE materials and their integration into textiles.

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Fabrication of Bi-Te Based Thermoelectric Semiconductors by Using Hybrid Powders

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.297-300.875 ◽

2005 ◽

Vol 297-300 ◽

pp. 875-880

Author(s):

Cheol Ho Lim ◽

Ki Tae Kim ◽

Yong Hwan Kim ◽

Dong Choul Cho ◽

Young Sup Lee ◽

...

Keyword(s):

Mechanical Properties ◽

Single Crystals ◽

Thermoelectric Properties ◽

Thermoelectric Materials ◽

Figure Of Merit ◽

Bending Strength ◽

Mixing Ratio ◽

Plasma Sintering ◽

Spark Plasma ◽

P Type

P-type Bi0.5Sb1.5Te3 compounds doped with 3wt% Te were fabricated by spark plasma sintering and their mechanical and thermoelectric properties were investigated. The sintered compounds with the bending strength of more than 50MPa and the figure-of-merit 2.9×10-3/K were obtained by controlling the mixing ratio of large powders (PL) and small powders (PS). Compared with the conventionally prepared single crystal thermoelectric materials, the bending strength was increased up to more than three times and the figure-of-merit Z was similar those of single crystals. It is expected that the mechanical properties could be improved by using hybrid powders without degradation of thermoelectric properties.

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Термоэлектрические свойства нанокомпозитного Bi-=SUB=-0.45-=/SUB=-Sb-=SUB=-1.55-=/SUB=-Te-=SUB=-2.985-=/SUB=- с микрочастицами SiO-=SUB=-2-=/SUB=-

Физика и техника полупроводников ◽

10.21883/ftp.2019.06.47721.30 ◽

2019 ◽

Vol 53 (6) ◽

pp. 751

Author(s):

А.А. Шабалдин ◽

П.П. Константинов ◽

Д.А. Курдюков ◽

Л.Н. Лукьянова ◽

А.Ю. Самунин ◽

...

Keyword(s):

Thermal Conductivity ◽

Solid Solution ◽

Electrical Conductivity ◽

Wide Temperature Range ◽

Figure Of Merit ◽

Nanostructured Material ◽

Thermoelectric Figure Of Merit ◽

Thermoelectric Efficiency ◽

Thermoelectric Figure ◽

P Type

AbstractNanocomposite thermoelectrics based on Bi_0.45Sb_1.55Te_2.985 solid solution of p -type conductivity are fabricated by the hot pressing of nanopowders of this solid solution with the addition of SiO_2 microparticles. Investigations of the thermoelectric properties show that the thermoelectric power of the nanocomposites increases in a wide temperature range of 80–420 K, while the thermal conductivity considerably decreases at 80–320 K, which, despite a decrease in the electrical conductivity, leads to an increase in the thermoelectric efficiency in the nanostructured material without the SiO_2 addition by almost 50% (at 300 K). When adding SiO_2, the efficiency decreases. The initial thermoelectric fabricated without nanostructuring, in which the maximal thermoelectric figure of merit ZT = 1 at 390 K, is most efficient at temperatures above 350 K.

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A High Thermoelectric Performance ZT in p-Type LaSe2 Crystal

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.871.203 ◽

2021 ◽

Vol 871 ◽

pp. 203-207

Author(s):

Jian Liu

Keyword(s):

Thermal Conductivity ◽

Power Factor ◽

High Power ◽

Density Functional ◽

Lattice Thermal Conductivity ◽

Phonon Transport ◽

Thermoelectric Performance ◽

Boltzmann Transport ◽

High Power Factor ◽

P Type

In this work, we use first principles DFT calculations, anharmonic phonon scatter theory and Boltzmann transport method, to predict a comprehensive study on the thermoelectric properties as electronic and phonon transport of layered LaSe2 crystal. The flat-and-dispersive type band structure of LaSe2 crystal offers a high power factor. In the other hand, low lattice thermal conductivity is revealed in LaSe2 semiconductor, combined with its high power factor, the LaSe2 crystal is considered a promising thermoelectric material. It is demonstrated that p-type LaSe2 could be optimized to exhibit outstanding thermoelectric performance with a maximum ZT value of 1.41 at 1100K. Explored by density functional theory calculations, the high ZT value is due to its high Seebeck coefficient S, high electrical conductivity, and low lattice thermal conductivity .

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Substitution Versus Full-Heusler Segregation in TiCoSb

Metals ◽

10.3390/met8110935 ◽

2018 ◽

Vol 8 (11) ◽

pp. 935 ◽

Cited By ~ 1

Author(s):

Maryana Asaad ◽

Jim Buckman ◽

Jan-Willem Bos

Keyword(s):

Powder Metallurgy ◽

Power Factor ◽

Thermoelectric Materials ◽

Room Temperature ◽

The Difference ◽

P Type ◽

Full Heusler ◽

Thermal Conductivities

Half-Heuslers (HHs) are promising thermoelectric materials with great compositional flexibility. Here, we extend work on the p-type doping of TiCoSb using abundant elements. Ti0.7V0.3Co0.85Fe0.15Sb0.7Sn0.3 samples with nominal 17.85 p-type electron count were investigated. Samples prepared using powder metallurgy have negative Seebeck values, S ≤ −120 µV K−1, while arc-melted compositions are compensated semiconductors with S = −45 to +30 µV K−1. The difference in thermoelectric response is caused by variations in the degree of segregation of V(Co0.6Fe0.4)2Sn full-Heusler and Sn phases, which selectively absorb V, Fe, and Sn. The segregated microstructure leads to reduced lattice thermal conductivities, κlat = 4.5−7 W m−1 K−1 near room temperature. The largest power factor, S2/ρ = 0.4 mW m−1 K−2 and ZT = 0.06, is observed for the n-type samples at 800 K. This works extends knowledge regarding suitable p-type dopants for TiCoSb.

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Tuning the Thermoelectric Material’s Parameter: A Comprehensive Review

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.17531 ◽

2020 ◽

Vol 20 (6) ◽

pp. 3636-3646

Author(s):

Manoj Kumar ◽

Sanju Rani ◽

Yogesh Singh ◽

V. N. Singh

Keyword(s):

Thermal Conductivity ◽

Power Factor ◽

Thermoelectric Materials ◽

Experimental Results ◽

Thermoelectric Device ◽

Thermoelectric Efficiency ◽

Comprehensive Review ◽

Waste Energy ◽

Device Geometry

Thermoelectric is a device that converts heat into electricity. As thermodynamically it is not possible to make device which is 100 percent efficient, some amount of energy is wasted in the form of heat. Thermoelectric materials can play a major role in harnessing such waste energy. Although thermoelectric is a useful device still its efficiency is not good enough for commercialization. Therefore, lots of research have been carried out in finding out the best possible material, device geometry etc. There are thousands of papers describing various optimization processes. The present work reviews the basics of thermoelectric device parameters which determine the performance of the device and how to control these parameters for better thermoelectric efficiency. The efforts made to optimize parameters like power factor, thermal conductivity etc. have been summarized. Experimental results have been described with examples. Highest reported ZT values of various materials have been presented in this review.

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