Simultaneous enhancement in the power factor and thermoelectric performance of copper sulfide by In2S3 doping

2016 ◽  
Vol 4 (32) ◽  
pp. 12624-12629 ◽  
Author(s):  
Qing-Long Meng ◽  
Shuang Kong ◽  
Zhiwei Huang ◽  
Yuanhu Zhu ◽  
Heng-Chang Liu ◽  
...  
Keyword(s):  
Power Factor ◽  
Copper Sulfide ◽  
Thermoelectric Performance ◽  
Practical Application

Simultaneous enhancement in the power factor and thermoelectric performance of copper sulfide is realized by introducing In2S3, which will be beneficial to the practical application.

scholarly journals High Thermoelectric Performance Achieved in Sb-doped GeTe by Manipulating Carrier Concentration and Nanoscale Twin Grains

2021 ◽  
Author(s):  
Chao Li ◽  
Haili Song ◽  
Lei Miao ◽  
Chengqiang Cui ◽  
Chengyan Liu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Power Factor ◽  
High Power ◽  
Thermoelectric Performance ◽  
Significant Suppression ◽  
Practical Application ◽  
Promising Candidate ◽  
High Power Factor ◽  
High Maximum ◽  
Sb Doping

Abstract Lead-free and eco-friendly GeTe shows a promising candidate for mid-temperature thermoelectric application. However, a low Seebeck coefficient due to its intrinsically high holes concentration that induced by Ge vacancies, and a relatively high thermal conductivity result in an inferior thermoelectric performance of pristine GeTe. However, extrinsic atoms Sb, Bi, and Y could play a crucial role in regulating the holes concentration of GeTe because of their relatively high solubility. Here we investigate the thermoelectric performance of the GeTe upon Sb doping, and demonstrate a high maximum zT value up to 1.88 could be achieved in Ge 0.90 Sb 0.10 Te as a result of the significant suppression in thermal conductivity while holding a high power factor. Where the maintained high power factor is due to the markable enhancement in S , which could be attributed to the significant suppression of holes concentration and the valence band convergence upon Sb doping; while the low thermal conductivity stems from the suppression of electronic thermal conductivity due to the increase in electrical resistivity and the lowering of lattice thermal conductivity through strengthening the phonons scattering by the lattice distortion, dislocations, and twin boundaries. Aside from the excellent thermoelectric performance, Ge 0.90 Sb 0.10 Te also shows good reproducibility, as well as thermal stability. This work confirms the Ge 0.90 Sb 0.10 Te is a superior thermoelectric material for practical application.

Enhanced thermoelectric performance of band structure engineered GeSe1−xTex alloys

2021 ◽  
Vol 5 (6) ◽  
pp. 1734-1746
Author(s):  
D. Sidharth ◽  
A. S. Alagar Nedunchezhian ◽  
R. Akilan ◽  
Anup Srivastava ◽  
Bhuvanesh Srinivasan ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Band Structure ◽  
Power Factor ◽  
Thermoelectric Performance

The power factor of GeSe enhanced and thermal conductivity decreased by Te substitution and thereby, GeSe0.80Te0.20 exhibits high ZT.

scholarly journals Macroscopic weavable fibers of carbon nanotubes with giant thermoelectric power factor

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Natsumi Komatsu ◽  
Yota Ichinose ◽  
Oliver S. Dewey ◽  
Lauren W. Taylor ◽  
Mitchell A. Trafford ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Thermoelectric Power ◽  
Power Factor ◽  
Fermi Energy ◽  
Performance Enhancement ◽  
Thermoelectric Performance ◽  
Thermoelectric Power Factor ◽  
Large Power ◽  
Energy Tuning

AbstractLow-dimensional materials have recently attracted much interest as thermoelectric materials because of their charge carrier confinement leading to thermoelectric performance enhancement. Carbon nanotubes are promising candidates because of their one-dimensionality in addition to their unique advantages such as flexibility and light weight. However, preserving the large power factor of individual carbon nanotubes in macroscopic assemblies has been challenging, primarily due to poor sample morphology and a lack of proper Fermi energy tuning. Here, we report an ultrahigh value of power factor (14 ± 5 mW m−1 K−2) for macroscopic weavable fibers of aligned carbon nanotubes with ultrahigh electrical and thermal conductivity. The observed giant power factor originates from the ultrahigh electrical conductivity achieved through excellent sample morphology, combined with an enhanced Seebeck coefficient through Fermi energy tuning. We fabricate a textile thermoelectric generator based on these carbon nanotube fibers, which demonstrates high thermoelectric performance, weavability, and scalability. The giant power factor we observe make these fibers strong candidates for the emerging field of thermoelectric active cooling, which requires a large thermoelectric power factor and a large thermal conductivity at the same time.

scholarly journals Backbone Effects on the Thermoelectric Properties of Ultra-Small Bandgap Conjugated Polymers

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2486
Author(s):  
Dexun Xie ◽  
Jing Xiao ◽  
Quanwei Li ◽  
Tongchao Liu ◽  
Jinjia Xu ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Power Factor ◽  
Carrier Mobility ◽  
Polymeric Materials ◽  
Thermoelectric Performance ◽  
Organic Thermoelectric Materials ◽  
Higher Power ◽  
Donor Acceptor ◽  
Maximum Power Factor ◽  
Higher Carrier Mobility

Conjugated polymers with narrower bandgaps usually induce higher carrier mobility, which is vital for the improved thermoelectric performance of polymeric materials. Herein, two indacenodithiophene (IDT) based donor–acceptor (D-A) conjugated polymers (PIDT-BBT and PIDTT-BBT) were designed and synthesized, both of which exhibited low-bandgaps. PIDTT-BBT showed a more planar backbone and carrier mobility that was two orders of magnitude higher (2.74 × 10−2 cm2V−1s−1) than that of PIDT-BBT (4.52 × 10−4 cm2V−1s−1). Both exhibited excellent thermoelectric performance after doping with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane, where PIDTT-BBT exhibited a larger conductivity (0.181 S cm−1) and a higher power factor (1.861 μW m−1 K−2) due to its higher carrier mobility. The maximum power factor of PIDTT-BBT reached 4.04 μW m−1 K−2 at 382 K. It is believed that conjugated polymers with a low bandgap are promising in the field of organic thermoelectric materials.

Synergistic optimization of carrier transport and thermal conductivity in Sn-doped Cu2Te

2018 ◽  
Vol 6 (39) ◽  
pp. 18928-18937 ◽  
Author(s):  
Yuchong Qiu ◽  
Ying Liu ◽  
Jinwen Ye ◽  
Jun Li ◽  
Lixian Lian
Keyword(s):  
Thermal Conductivity ◽  
Fermi Level ◽  
Carrier Concentration ◽  
Power Factor ◽  
Carrier Transport ◽  
Lone Pair ◽  
Thermoelectric Performance ◽  
Degenerate Semiconductors ◽  
Lone Pair Electrons

Doping Sn into the Cu2Te lattice can synergistically enhance the power factor and decrease thermal conductivity, leading to remarkably optimized zTs. The lone pair electrons from the 5s orbital of Sn can increase the DOS near the Fermi level of Cu2Te to promote PF and reduce κe by decreasing the carrier concentration. This study explores a scalable strategy to optimize the thermoelectric performance for intrinsically highly degenerate semiconductors.

A High Thermoelectric Performance ZT in p-Type LaSe2 Crystal

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 .

Solution-processed two-dimensional layered heterostructure thin-film with optimized thermoelectric performance

2017 ◽  
Vol 19 (27) ◽  
pp. 17560-17567 ◽  
Author(s):  
Tongzhou Wang ◽  
Congcong Liu ◽  
Fengxing Jiang ◽  
Zhaofen Xu ◽  
Xiaodong Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Power Factor ◽  
Carrier Transport ◽  
Thermoelectric Performance ◽  
Two Dimensional ◽  
Transport Barrier ◽  
Solution Processed

The content of rGO could alter the carrier transport barrier, and the optimizing power factor was achieved at rGO–MS2 junctions.

High thermoelectric performance of polycrystalline In4Se3−δ(CuI)x: synergistic effects of the Se-deficiency and CuI-doping

2016 ◽  
Vol 3 (12) ◽  
pp. 1566-1571 ◽  
Author(s):  
Yan-Chun Chen ◽  
Hua Lin ◽  
Li-Ming Wu
Keyword(s):  
Synergistic Effect ◽  
Power Factor ◽  
Figure Of Merit ◽  
Synergistic Effects ◽  
Thermoelectric Performance ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Se Deficiency

Synergistic effect of Se-deficiency and CuI-doping significantly enhances the thermoelectric figure-of-merit of the n-type polycrystalline In4Se3-based materials via improving the power factor. With In4Se2.95(CuI)0.01, ZT = 1.34 at 723 K, the highest value obtained for Pb-free polycrystalline In4Se3-based materials to date.

Realized high power factor and thermoelectric performance in Cu2SnSe3

2019 ◽  
Vol 159 ◽  
pp. 46-50 ◽  
Author(s):  
J. Zhang ◽  
L.L. Huang ◽  
X.G. Zhu ◽  
Z.M. Wang ◽  
C.J. Song ◽  
...  
Keyword(s):  
Power Factor ◽  
High Power ◽  
Thermoelectric Performance ◽  
High Power Factor

Realized high power factor and thermoelectric performance in Cu3SbSe4

2019 ◽  
Vol 109 ◽  
pp. 68-73 ◽  
Author(s):  
J.M. Li ◽  
D. Li ◽  
C.J. Song ◽  
L. Wang ◽  
H.X. Xin ◽  
...  
Keyword(s):  
Power Factor ◽  
High Power ◽  
Thermoelectric Performance ◽  
High Power Factor
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