Tuning the carrier scattering mechanism to effectively improve the thermoelectric properties

2017 ◽  
Vol 10 (3) ◽  
pp. 799-807 ◽  
Author(s):  
Jing Shuai ◽  
Jun Mao ◽  
Shaowei Song ◽  
Qing Zhu ◽  
Jifeng Sun ◽  
...  
Keyword(s):  
Thermoelectric Power ◽  
Power Density ◽  
Output Power ◽  
Power Factor ◽  
Figure Of Merit ◽  
Scattering Mechanism ◽  
Thermoelectric Power Factor ◽  
Carrier Scattering ◽  
High Figure ◽  
Large Output

A high thermoelectric power factor not only enables a potentially high figure of merit ZT but also leads to a large output power density, and hence it is pivotal to find an effective route to improve the power factor.

Thermoelectric Power Factor of Polycrystalline La0.75Sr0.25Co1-xMnxO3-δCeramics

2009 ◽  
Vol 1166 ◽  
Author(s):  
Julio E. Rodríguez ◽  
J. A. Niño
Keyword(s):  
Transport Properties ◽  
Thermoelectric Power ◽  
Power Factor ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Manganese Content ◽  
Solid State Reaction Method ◽  
Measured Temperature ◽  
Thermoelectric Power Factor ◽  
Temperature Range

AbstractThermoelectric properties of polycrystalline La0.75Sr0.25Co1-xMnxO3-δ(0<x<0.08) (LSCoO-Mn) compounds have been studied. The samples were grown by solid-state reaction method; their transport properties were studied in the temperature range between 100 and 290K, as a function of temperature and the manganese content. The Seebeck coefficient (S) is positive over the measured temperature range and its magnitude increases with the manganese content up to values close to 160 μV/K. The electrical resistivity (ρ) goes from metallic to semiconducting behavior as the Mn level increases, at room temperature, ρ(T) exhibit values less than 4mΩ-cm. From S(T), ρ(T) and κ(T) data, the thermoelectric power factor and the figure of merit were determined. These performance parameters reach maximum values around 18 μW/K2-cm and 0.2, respectively. The observed behavior in the transport properties become these compounds potential thermoelectric materials, which could be used in thermoelectric applications.

Effects of Oxygen-Reduction on Thermoelectric Properties of Sr0.61Ba0.39Nb2O6 Ceramics

2014 ◽  
Vol 787 ◽  
pp. 210-214 ◽  
Author(s):  
Yi Li ◽  
Jian Liu ◽  
Chun Lei Wang ◽  
Wen Bin Su ◽  
Yuan Hu Zhu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Oxygen Reduction ◽  
Thermoelectric Power ◽  
Thermoelectric Properties ◽  
Power Factor ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Thermoelectric Power Factor

The thermoelectric properties of Sr0.61Ba0.39Nb2O6 ceramics, reduced in various conditions, were investigated in the temperature range from 323K to 1073K. Both the electrical resistivity and the absolute Seebeck coefficient decreased with the deepening degree of oxygen-reduction. However, the decrease of the electrical resistivity had a major influence on the thermoelectric power factor. Therefore, the more heavily reduced sample can gain the higher value of thermoelectric power factor. It has been observed that the thermal conductivity increased with the deepening degree of oxygen-reduction, which indicates that the scattering of the oxygen vacancies produced by reduction does not play a dominant role in the thermal conduction. In spite of the increase of the thermal conductivity, the oxygen-reduction still promoted the thermoelectric figure of merit via the increase of the thermoelectric power factor. And the most heavily reduced Sr0.61Ba0.39Nb2O6 ceramic has the highest thermoelectric figure of merit (~0.18 at 1073 K) among all the samples.

Resonant carrier scattering by core-shell nanoparticles for thermoelectric power factor enhancement

2012 ◽  
Vol 100 (1) ◽  
pp. 012102 ◽  
Author(s):  
Je-Hyeong Bahk ◽  
Parthiban Santhanam ◽  
Zhixi Bian ◽  
Rajeev Ram ◽  
Ali Shakouri
Keyword(s):  
Thermoelectric Power ◽  
Power Factor ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Thermoelectric Power Factor ◽  
Carrier Scattering ◽  
Core Shell Nanoparticles

scholarly journals High thermoelectric power factor of pure and vanadium-alloyed chromium nitride thin films

2021 ◽  
pp. 102493
Author(s):  
M.A. Gharavi ◽  
D. Gambino ◽  
A. le Febvrier ◽  
F. Eriksson ◽  
R. Armiento ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermoelectric Power ◽  
Power Factor ◽  
Chromium Nitride ◽  
Thermoelectric Power Factor

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.

Improved thermoelectric power factor achieved by energy filtering in ZnO:Mg/ZnO hetero-structures

2021 ◽  
Vol 721 ◽  
pp. 138537
Author(s):  
Anh Tuan Thanh Pham ◽  
Phuong Thanh Ngoc Vo ◽  
Hanh Kieu Thi Ta ◽  
Hoa Thi Lai ◽  
Vinh Cao Tran ◽  
...  
Keyword(s):  
Thermoelectric Power ◽  
Power Factor ◽  
Thermoelectric Power Factor ◽  
Energy Filtering

Enhanced thermoelectric power factor of Re-substituted higher manganese silicides with small islands of MnSi secondary phase

2015 ◽  
Vol 3 (40) ◽  
pp. 10500-10508 ◽  
Author(s):  
Xi Chen ◽  
Jianshi Zhou ◽  
John B. Goodenough ◽  
Li Shi
Keyword(s):  
Thermoelectric Power ◽  
Power Factor ◽  
Secondary Phase ◽  
Small Islands ◽  
Thermoelectric Power Factor ◽  
Higher Manganese Silicides ◽  
Quenching Method

A rhenium-substituted HMS sample with small islands of MnSi secondary phase has been prepared by the quenching method. Such unique microstructure leads to an enhanced thermoelectric power factor (PF) as compared to the samples prepared by other methods.

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