Nanostructured SnSe integrated with Se quantum dots with ultrahigh power factor and thermoelectric performance from magnetic field-assisted hydrothermal synthesis

2019 ◽  
Vol 7 (26) ◽  
pp. 15757-15765 ◽  
Author(s):  
Rui Xu ◽  
Lulu Huang ◽  
Jian Zhang ◽  
Di Li ◽  
Jizi Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Hydrothermal Synthesis ◽  
Density Of States ◽  
Power Factor ◽  
Thermoelectric Performance ◽  
Energy Filtering ◽  
Filtering Effect ◽  
Nano Grains

Through magnetic field-assisted hydrothermal synthesis, high thermoelectric performance of SnSe is obtained due to Se quantum dots and smaller nano grains, leading to enhanced density of states and energy filtering effect.

scholarly journals Enhanced thermoelectric performance of Bi–Sb–Te/Sb2O3 nanocomposites by energy filtering effect

2018 ◽  
Vol 6 (43) ◽  
pp. 21341-21349 ◽  
Author(s):  
Amir Pakdel ◽  
Quansheng Guo ◽  
Valeria Nicolosi ◽  
Takao Mori
Keyword(s):  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Performance ◽  
Energy Filtering ◽  
Filtering Effect

24 month high-ZT stability of Bi0.5Sb1.5Te3/Sb2O3 nanocomposites that demonstrate simultaneous Seebeck coefficient enhancement and thermal conductivity decline through energy filtering effect.

Effect of crystal size distribution on thermoelectric performance for Lanthanum-doped strontium titanate bulk material

2015 ◽  
Vol 08 (06) ◽  
pp. 1550070
Author(s):  
Boyu Zhang ◽  
Jun Wang ◽  
Xinba Yaer ◽  
Zhenzhen Huo ◽  
Yin Wu ◽  
...  
Keyword(s):  
Size Distribution ◽  
Strontium Titanate ◽  
Crystal Size ◽  
Bulk Material ◽  
Crystal Size Distribution ◽  
Thermoelectric Performance ◽  
Potential Barriers ◽  
Seebeck Coefficients ◽  
Energy Filtering ◽  
Filtering Effect

Effect of crystal size distribution on thermoelectric performance of Lanthanum-doped strontium titanate ( La - SrTiO 3) ceramics are investigated in this study. Thermoelectric performance measurement, coupled with microstructure studies, shows that the electrical conductivity strongly depends on the crystal size, potential barrier on the grain boundary and porosity. Meantime, because the average potential barriers height are increased along with the reduction of crystal size, the Seebeck coefficients are increased by energy filtering effect at the large number of grain boundaries. As a result, by controlling of crystal size distribution, ZT value of La - SrTiO 3 is improved.

Significant enhancement in the Seebeck coefficient and power factor of thermoelectric polymers by the Soret effect of polyelectrolytes

2018 ◽  
Vol 6 (40) ◽  
pp. 19347-19352 ◽  
Author(s):  
Xin Guan ◽  
Hanlin Cheng ◽  
Jianyong Ouyang
Keyword(s):  
Seebeck Coefficient ◽  
Power Factor ◽  
Soret Effect ◽  
Ion Accumulation ◽  
Thermoelectric Performance ◽  
Significant Enhancement ◽  
Energy Filtering ◽  
Polyelectrolyte Layer

The thermoelectric performance of PEDOT:PSS can be significantly enhanced by energy filtering arising from ion accumulation in the polyelectrolyte layer.

Enhancement of power factor by energy filtering effect in hierarchical BiSbTe3 nanostructures for thermoelectric applications

2017 ◽  
Vol 418 ◽  
pp. 246-251 ◽  
Author(s):  
M. Sabarinathan ◽  
M. Omprakash ◽  
S. Harish ◽  
M. Navaneethan ◽  
J. Archana ◽  
...  
Keyword(s):  
Power Factor ◽  
Energy Filtering ◽  
Filtering Effect

Enhanced thermoelectric performance via carrier energy filtering effect in β-Zn4Sb3 alloy bulk embedded with (Bi2Te3)0.2(Sb2Te3)0.8

2014 ◽  
Vol 115 (5) ◽  
pp. 053710 ◽  
Author(s):  
T. H. Zou ◽  
X. Y. Qin ◽  
D. Li ◽  
B. J. Ren ◽  
G. L. Sun ◽  
...  
Keyword(s):  
Thermoelectric Performance ◽  
Energy Filtering ◽  
Carrier Energy ◽  
Filtering Effect

scholarly journals Enhanced mechanism of thermoelectric performance of Bi2Se3 using density functional theory

2020 ◽  
Vol 9 (3) ◽  
Author(s):  
Muhammad Zamir Mohyedin ◽  
Mohamad Fariz Mohamad Taib ◽  
Afiq Radzwan ◽  
M. Mustaffa ◽  
Amiruddin Shaari ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Effective Mass ◽  
Thermoelectric Properties ◽  
Density Of States ◽  
Power Factor ◽  
Figure Of Merit ◽  
Density Functional ◽  
Thermoelectric Performance ◽  
Boltzmann Transport ◽  
Functional Theory

Abstract Good thermoelectric performance is being sought to face major problems related to energy, especially in the concern of the usage of energy on environmental impact. In this work, we investigate the underlying mechanism to enhance the thermoelectric performance of bismuth selenide (Bi2Se3) by employing density functional theory (DFT) followed by the Boltzmann transport equation under relaxation time approximation. The structural, electronic, and thermoelectric properties were calculated and analyzed. From the analysis of combined results of thermoelectric properties and electronic properties as the function of the Fermi level, we found that the power factor of Bi2Se3 is improved by increasing electrical conductivity that contributed by the large density of states and light effective mass of charge carriers. The figure of merit, on the other hand, is enhanced by increasing Seebeck coefficient that contributed by heavy effective mass and decreasing thermal conductivity that contributed by low density of states. We also found that both power factor and figure of merit can be improved through n-type doping at 300 K and p-type doping at higher temperature (400 K and 500 K).

Thermoelectric all-carbon heterostructures for a flexible thermoelectric generator

2021 ◽  
Vol 5 (1) ◽  
pp. 267-273
Author(s):  
Hyeonseok Hwang ◽  
Kwang-Suk Jang
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Thermoelectric Generator ◽  
Thermoelectric Performance ◽  
Carbon Nanoparticle ◽  
Energy Filtering ◽  
Filtering Effect ◽  
Flexible Thermoelectric

High-performance thermoelectric all-carbon heterostructures are investigated. The carbon nanoparticle barrier between carbon nanotubes can enhance the thermoelectric performance due to the energy filtering effect.

Enhanced figure of merit in Mg2Si0.877Ge0.1Bi0.023/multi wall carbon nanotube nanocomposites

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65328-65336 ◽  
Author(s):  
Nader Farahi ◽  
Sagar Prabhudev ◽  
Matthieu Bugnet ◽  
Gianluigi A. Botton ◽  
Jianbao Zhao ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Power Factor ◽  
Figure Of Merit ◽  
Phonon Scattering ◽  
Thermoelectric Performance ◽  
Multi Wall Carbon Nanotubes ◽  
Energy Filtering ◽  
Multi Wall Carbon Nanotube

Adding multi wall carbon nanotubes to Mg2Si0.877Ge0.1Bi0.023 led to an increased power factor via energy filtering as well as a lowered thermal conductivity via increased phonon scattering, and thus an enhanced thermoelectric performance.

Tuning SnSe/SnS hetero-interfaces to enhance thermoelectric performance

2018 ◽  
Vol 11 (04) ◽  
pp. 1850069 ◽  
Author(s):  
Xuerui Liu ◽  
Shuankui Li ◽  
Tinyang Liu ◽  
Weiming Zhu ◽  
Rui Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Materials ◽  
High Performance ◽  
Multiple Scales ◽  
Phonon Transport ◽  
Thermoelectric Performance ◽  
Energy Filtering ◽  
Promising Strategy ◽  
Filtering Effect ◽  
Heterogeneous Nanostructure

With the development of nanotechnology, thermoelectric materials with complex heterogeneous nanostructure offer a promising approach to improve the thermoelectric performance. In this work, SnSe/SnS hetero-nanosheet was tuned by the epitaxial growth of SnSe on the few layers of SnS nanosheets. The heterojunction interface can optimize the carrier/phonon transport behavior by energy filtering effect and scattering the phonon in multiple scales. Compared with pristine SnSe, the power factor of SnSe/SnS hetero-nanosheet increases from 2.2[Formula: see text][Formula: see text]V/cmK2 to 3.21[Formula: see text][Formula: see text]V/cmK2 at 773[Formula: see text]K, whereas the thermal conductivity decreases significantly from 0.65[Formula: see text]W[Formula: see text][Formula: see text][Formula: see text]m[Formula: see text] to 0.48[Formula: see text]W[Formula: see text][Formula: see text][Formula: see text]m[Formula: see text] at 773[Formula: see text]K. The maximum ZT of 0.5 is obtained at 773[Formula: see text]K in the SnSe/SnS hetero-nanosheets, which is 89% higher than pristine SnSe. This approach is proved to be a promising strategy to design high performance thermoelectric materials.

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