Dramatic enhancement of thermoelectric power factor in PbTe:Cr co-doped with iodine

2011 ◽  
Vol 98 (26) ◽  
pp. 262101 ◽  
Author(s):  
Biplab Paul ◽  
P. K. Rawat ◽  
P. Banerji
Keyword(s):  
Thermoelectric Power ◽  
Power Factor ◽  
Thermoelectric Power Factor ◽  
Co Doped

THERMOELECTRIC EFFECT OF SILICON FILMS WITH SHALLOW- AND DEEP-LEVEL ACCEPTORS

2012 ◽  
Vol 26 (31) ◽  
pp. 1250187 ◽  
Author(s):  
Q. R. HOU ◽  
J. L. SUN ◽  
B. F. GU ◽  
Y. B. CHEN ◽  
Y. J. HE
Keyword(s):  
Electrical Resistivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Power ◽  
Power Factor ◽  
Deep Level ◽  
Silicon Films ◽  
Thermoelectric Power Factor ◽  
Si Films ◽  
Quartz Substrates ◽  
Co Doped

Crystalline Si films with both shallow- and deep-level acceptors, Al and Cu , have been prepared on glass and quartz substrates by the methods of magnetron sputtering and Al -induced crystallization. Al and Cu are co-added in the Si films intermittently by regular pulse sputtering of Al and Cu targets during deposition of the Si films. By regulating the sputtering times of Al and Cu targets, the amounts of Al and Cu in the Si films can be controlled, and thus the Seebeck coefficient and electrical resistivity of the silicon films can be adjusted. It is found that the Al and Cu co-doped Si film has a larger Seebeck coefficient and a lower electrical resistivity at higher temperatures, as compared with that of only Al -doped Si film. As a result, the thermoelectric power factor of the Al and Cu co-doped Si film is greatly enhanced. The present experimental results will not only help us to understand the basic thermoelectric properties of semiconductors doubly doped with shallow- and deep-level impurities, but also open the possibility of enhancement of thermoelectric power factor by using this concept.

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.

Rapid Synthesis of Bi Substituted Ca3Co4O9 by a Polyacrylamide Gel Method and its High-Temperature Thermoelectric Power Factor

2010 ◽  
Vol 434-435 ◽  
pp. 393-396 ◽  
Author(s):  
Ying Song ◽  
Qiu Sun ◽  
Li Rong Zhao ◽  
Fu Ping Wang
Keyword(s):  
High Temperature ◽  
Thermoelectric Power ◽  
Power Factor ◽  
Solid State Reaction Method ◽  
Polyacrylamide Gel ◽  
Measured Temperature ◽  
Thermoelectric Power Factor ◽  
Gel Method ◽  
Plasma Sintering ◽  
Polyacrylamide Gel Method

A series of polycrystalline (Ca1-xBix)3Co4O9 ( x = 0.0 ~ 0.075 ) powders were synthesized rapidly by a polyacrylamide gel method. The dense ceramics were fabricated using the spark plasma sintering ( SPS ) technique. Effects of Bi substitution on high temperature thermoelectric properties of Ca3Co4O9 were evaluated. Both the electrical conductivity and Seebeck coefficient increased with increasing Bi content up to x = 0.05, thus leading to an enhanced thermoelectric power factor. The Bi substituted sample with x = 0.05 obtained in this study has the highest thermoelectric power factor in the measured temperature range. It reaches 4.810-4 Wm-1K-2 at 700 °C, which is 26 % higher than that of Ca3Co4O9 without Bi substitution, and is by up to 15 % larger as compared to the Bi substituted sample synthesized by the solid state reaction method and the SPS technique due to the high chemical homogeneous powder prepared by the polyacrylamide gel method.

Simultaneous enhancement in thermoelectric power factor and phonon blocking in hierarchical nanostructured β-Zn4Sb3-Cu3SbSe4

2014 ◽  
Vol 104 (1) ◽  
pp. 013904 ◽  
Author(s):  
T. H. Zou ◽  
X. Y. Qin ◽  
D. Li ◽  
G. L. Sun ◽  
Y. C. Dou ◽  
...  
Keyword(s):  
Thermoelectric Power ◽  
Power Factor ◽  
Thermoelectric Power Factor
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