Non-linear enhancement of thermoelectric performance of a TiSe2 monolayer due to tensile strain, from first-principles calculations

2019 ◽  
Vol 7 (24) ◽  
pp. 7308-7317 ◽  
Author(s):  
Safoura Nayeb Sadeghi ◽  
Mona Zebarjadi ◽  
Keivan Esfarjani
Keyword(s):  
First Principles ◽  
Density Functional ◽  
Transport Theory ◽  
First Principles Calculations ◽  
Boltzmann Transport ◽  
Functional Theory ◽  
Thermoelectric Transport ◽  
Exchange Correlation ◽  
Boltzmann Transport Theory ◽  
Thermoelectric Transport Properties

Using first-principles density functional theory (DFT) calculations combined with the Boltzmann transport theory, we investigate the effect of strain on the electronic and thermoelectric transport properties of the 1T-TiSe2 monolayer, a two-dimensional (2D) material, and compare it with the bulk phase within the PBE, LDA+U and HSE exchange–correlation functionals.

scholarly journals Electronic, optical and thermoelectric properties of Fe2ZrP compound determined via first-principles calculations

RSC Advances ◽  
2019 ◽  
Vol 9 (44) ◽  
pp. 25900-25911 ◽  
Author(s):  
Esmaeil Pakizeh ◽  
Jaafar Jalilian ◽  
Mahnaz Mohammadi
Keyword(s):  
Density Functional Theory ◽  
Thermoelectric Properties ◽  
First Principles ◽  
Density Functional ◽  
Transport Theory ◽  
First Principles Calculations ◽  
Boltzmann Transport ◽  
Functional Theory ◽  
Boltzmann Transport Theory ◽  
The Density Functional Theory

In this study, based on the density functional theory and semi-classical Boltzmann transport theory, we investigated the structural, thermoelectric, optical and phononic properties of the Fe2ZrP compound.

scholarly journals Bilayer MSe2 (M = Zr, Hf) as promising two-dimensional thermoelectric materials: a first-principles study

RSC Advances ◽  
2019 ◽  
Vol 9 (22) ◽  
pp. 12394-12403 ◽  
Author(s):  
Peng Yan ◽  
Guo-ying Gao ◽  
Guang-qian Ding ◽  
Dan Qin
Keyword(s):  
Thin Films ◽  
Thermoelectric Materials ◽  
First Principles ◽  
Transport Theory ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Boltzmann Transport ◽  
Thermoelectric Transport ◽  
Boltzmann Transport Theory ◽  
Thermoelectric Transport Properties

Motivated by experimental synthesis of two-dimensional MSe2 (M = Zr, Hf) thin films, we investigate the thermoelectric transport properties of MSe2 (M = Zr, Hf) bilayers by using first-principles calculations and Boltzmann transport theory.

Electronic structure of cubic BaTbO3 from first-principles pseudopotential calculations

2006 ◽  
Vol 84 (2) ◽  
pp. 115-120 ◽  
Author(s):  
G Y Gao ◽  
K L Yao ◽  
Z L Liu
Keyword(s):  
Electronic Structure ◽  
First Principles ◽  
Density Functional ◽  
First Principles Calculations ◽  
Generalized Gradient ◽  
Functional Theory ◽  
Exchange Correlation ◽  
Pseudopotential Calculations ◽  
Correlation Potential ◽  
Density Contour

First-principles calculations of the electronic structure are performed for cubic BaTbO3 using the plane-wave pseudopotential method within the framework of density functional theory and using the generalized gradient approximation for the exchange-correlation potential. Our calculations show that cubic BaTbO3 is metallic, and that this metallic character is mainly governed by the Tb 4f electrons and the hybridization between the Tb 5d and O 2p states. From the analysis of the density of states, band structure, and charge density contour, we find that the chemical bonding between Tb and O is covalent while that between Ba and TbO3 is ionic. PACS Nos.: 71.15.Mb, 71.20.-b

Ab-initio study of mechanical and thermoelectric properties of topological semimetal: LaAuPb

2021 ◽  
Author(s):  
Megha Goyal ◽  
M.M. Sinha
Keyword(s):  
Thermoelectric Properties ◽  
Density Functional ◽  
Transport Theory ◽  
Poisson Ratio ◽  
Topological Phase ◽  
Boltzmann Transport ◽  
Functional Theory ◽  
Boltzmann Transport Theory ◽  
Material Fabrication ◽  
The Stability

Abstract Heusler compounds are a tuneable class of material with a cubic crystal structure that can serve as a platform to study the topological phase of a material. These materials have numerous technological and scientific applications. So, in the present work, the mechanical, thermodynamical, and thermoelectric properties of LaAuPb in the topological phase have been reported by using density functional theory and Boltzmann transport theory. LaAuPb is mechanically stable, and the Poisson ratio reveals its ductile nature. The specific heat of the proposed compound at room temperature is 73.94 J K-1 mol-1 at constant volume. Debye’s temperature is estimated to be 188.64K. Moreover, the lattice thermal conductivity of the compound is 14.64 W/mK and 3.66 W/mK at 300K and 1200K, respectively. Good thermoelectric response of LaAuPb can be confirmed by its high value of the figure of merit (0.46) at 1200K. Hence, it is a potential material for thermoelectric applications. This work will help future researchers to better understand the stability, nature and behaviour of LaAuPb in material fabrication.

scholarly journals Ultralow and anisotropic thermal conductivity in semiconductor As2Se3

2018 ◽  
Vol 20 (3) ◽  
pp. 1809-1816 ◽  
Author(s):  
Robert L. González-Romero ◽  
Alex Antonelli ◽  
Anderson S. Chaves ◽  
Juan J. Meléndez
Keyword(s):  
Thermal Conductivity ◽  
Density Functional Theory ◽  
First Principles ◽  
Density Functional ◽  
Lattice Thermal Conductivity ◽  
Boltzmann Transport Equation ◽  
First Principles Calculations ◽  
Boltzmann Transport ◽  
Functional Theory ◽  
Anisotropic Thermal Conductivity

An ultralow lattice thermal conductivity of 0.14 W m−1 K−1 along the b⃑ axis of As2Se3 single crystals was obtained at 300 K by first-principles calculations involving density functional theory and the resolution of the Boltzmann transport equation.

Oxide Thermoelectrics

2007 ◽  
Vol 1044 ◽  
Author(s):  
David Joseph Singh
Keyword(s):  
First Principles ◽  
Transport Theory ◽  
Point Of View ◽  
First Principles Calculations ◽  
Boltzmann Transport ◽  
Oxide Thermoelectrics ◽  
Seebeck Coefficients ◽  
Boltzmann Transport Theory ◽  
Strong Hybridization ◽  
Narrow Bands

AbstractThermoelectricity in oxides, especially NaxCoO2 and related materials, is discussed from the point of view of first principles calculations and Boltzmann transport theory. The electronic structure of this material is exceptional in that it has a combination of very narrow bands and strong hybridization between metal d states and ligand p states. As shown within the framework of conventional Boltzmann transport theory, this leads to high Seebeck coefficients even at metallic carrier densities. This suggests a strategy of searching for other narrow band oxides that can be doped metallic with mobile carriers. Some possible avenues for finding such materials are suggested.

A supercell approach to the doping effect on the thermoelectric properties of SnSe

2015 ◽  
Vol 17 (44) ◽  
pp. 29647-29654 ◽  
Author(s):  
Yasumitsu Suzuki ◽  
Hisao Nakamura
Keyword(s):  
Thermoelectric Properties ◽  
First Principles ◽  
Transport Theory ◽  
Doping Effect ◽  
First Principles Calculations ◽  
Boltzmann Transport ◽  
Tin Selenide ◽  
Boltzmann Transport Theory

We study the thermoelectric properties of tin selenide (SnSe) by using first-principles calculations coupled with the Boltzmann transport theory.

Thermoelectric properties of organic charge transfer salts from first-principle investigations: Role of molecular packing and triiodide anions

2022 ◽  
Author(s):  
Yishan Wang ◽  
Meng Zhao ◽  
Hu Zhao ◽  
Shuzhou Li ◽  
Jia Zhu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
First Principles ◽  
Transport Theory ◽  
Deformation Potential ◽  
First Principles Calculations ◽  
Boltzmann Transport ◽  
Boltzmann Transport Theory ◽  
Charge Transfer Salts ◽  
Deformation Potential Theory

The potency of charge transfer (CT) salts in thermoelectric (TE) applications based on (5-CNB-EDT-TTF)4I3 is systematically explored by first-principles calculations combined with Boltzmann transport theory and deformation potential theory, focusing...

Thermoelectric performance of XI2 (X = Ge, Sn, Pb) bilayers

2021 ◽  
Author(s):  
Nan Lu ◽  
Jie Guan
Keyword(s):  
Thermal Conductivity ◽  
Figure Of Merit ◽  
Density Functional ◽  
Lattice Thermal Conductivity ◽  
Transport Theory ◽  
Boltzmann Transport ◽  
Functional Theory ◽  
Boltzmann Transport Theory ◽  
Dimensionless Figure Of Merit ◽  
Structure Calculations

Abstract We study the thermal and electronic transport properties as well as the TE performance of three two-dimensional XI2 (X = Ge, Sn, Pb) bilayers using density functional theory and Boltzmann transport theory. We compared the lattice thermal conductivity, electrical conductivity, Seebeck coefficient, and dimensionless figure of merit (ZT) for the XI2 monolayers and bilayers. Our results show that the lattice thermal conductivity at room temperature for the bilayers is as low as ~1.1-1.7 Wm-1K-1, which is about 1.6 times as large as the monolayers for all the three materials. Electronic structure calculations show that all the XI2 bilayers are indirect-gap semiconductors with the band gap values between 1.84 eV and 1.96 eV at PBE level, which is similar as the corresponding monolayers. The calculated results of ZT show that the bilayer structures display much less direction dependent TE efficiency and have much larger n-type ZT values compared with the monolayers. The dramatic difference between the monolayer and bilayer indicates that the inter-layer interaction plays an important role in the TE performance of XI2, which provides the tunability on their TE characteristics.

First-principles study of the electronic structure and thermoelectric properties of LaOBiCh2 (Ch=S, Se)

2017 ◽  
Vol 31 (29) ◽  
pp. 1750265 ◽  
Author(s):  
Guangtao Wang ◽  
Dongyang Wang ◽  
Xianbiao Shi ◽  
Yufeng Peng
Keyword(s):  
Electronic Structure ◽  
Thermoelectric Properties ◽  
First Principles ◽  
Electronic Structures ◽  
Figure Of Merit ◽  
Transport Theory ◽  
First Principles Calculations ◽  
Boltzmann Transport ◽  
Boltzmann Transport Theory ◽  
Better Than

We studied the crystal and electronic structures of LaOBiSSe and LaOBiSeS using first-principles calculations and confirmed that the LaOBiSSe (S atoms on the top of BiCh2 layer and Se atoms in the inner of it) is the stable structure. Then we calculate the thermoelectric properties of LaOBiSSe using the standard Boltzmann transport theory. The in-plane thermoelectric performance are better than that along the c-axis in this n-type material. The in-plane power factor [Formula: see text] of n-type LaOBiSSe is as high as 12 [Formula: see text]W/cmK2 at 900 K with figure of merit ZT = 0.53 and [Formula: see text]. The ZT maximum appears around [Formula: see text] in a wide temperature region. The results indicate that LaOBiSSe is a 2D material with good thermal performance in n-type doping.

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