Texturization-Induced In-Plane High-Performance Thermoelectrics and Inapplicability of the Debye Model to Out-of-Plane Lattice Thermal Conductivity in Misfit-Layered Chalcogenides

2019 ◽  
Vol 11 (51) ◽  
pp. 48079-48085 ◽  
Author(s):  
Cong Yin ◽  
Hangtian Liu ◽  
Qing Hu ◽  
Jing Tang ◽  
Yanzhong Pei ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Performance ◽  
Lattice Thermal Conductivity ◽  
Debye Model ◽  
Layered Chalcogenides ◽  
Plane Lattice ◽  
Out Of Plane

Anomalous in-plane lattice thermal conductivity in an atomically thin two-dimensional α-GeTe layer

2020 ◽  
Vol 22 (21) ◽  
pp. 12273-12280 ◽  
Author(s):  
Brahim Marfoua ◽  
Young Soo Lim ◽  
Jisang Hong
Keyword(s):  
Thermal Conductivity ◽  
Lattice Thermal Conductivity ◽  
2D Materials ◽  
Two Dimensional ◽  
Plane Lattice

The bilayer α-GeTe displayed an exceptionally low lattice thermal conductivity never reported in the atomically thin 2D materials.

Thermal Conductivity of Zn4−xCdxSb3 Solid Solutions

1997 ◽  
Vol 478 ◽  
Author(s):  
T. Caillat ◽  
A. Borshchevsky ◽  
J. -P. Fleurial
Keyword(s):  
Thermal Conductivity ◽  
High Performance ◽  
Figure Of Merit ◽  
Lattice Thermal Conductivity ◽  
State Of The Art ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Jet Propulsion ◽  
P Type ◽  
Electrical Conductors

Abstractβ-Zn4Sb3 was recently identified at the Jet Propulsion Laboratory as a new high performance p-type thermoelectric material with a maximum dimensionless thermoelectric figure of merit ZT of 1.4 at a temperature of 673K. A usual approach, used for many state-of-the-art thermoelectric materials, to further improve ZT values is to alloy β-Zn4Sb3 with isostructural compounds because of the expected decrease in lattice thermal conductivity. We have grown Zn4−xCdxSb3 crystals with 0.2≤x<1.2 and measured their thermal conductivity from 10 to 500K. The thermal conductivity values of Zn4−xCdxSb3 alloys are significantly lower than those measured for β-Zn4Sb3 and are comparable to its calculated minimum thermal conductivity. A strong atomic disorder is believed to be primarily at the origin of the very low thermal conductivity of these materials which are also fairly good electrical conductors and are therefore excellent candidates for thermoelectric applications.

scholarly journals Efficient interlayer charge release for high-performance layered thermoelectrics

2020 ◽  
Author(s):  
Hao Zhu ◽  
Zhou Li ◽  
Chenxi Zhao ◽  
Xingxing Li ◽  
Jinlong Yang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Carrier Concentration ◽  
High Performance ◽  
Lattice Thermal Conductivity ◽  
Transport Barrier ◽  
High Seebeck Coefficient ◽  
Valence Bands ◽  
Increase Carrier Concentration

Abstract Many layered superlattice materials intrinsically possess large Seebeck coefficient and low lattice thermal conductivity, but poor electrical conductivity because of the interlayer transport barrier for charges, which has become a stumbling block for achieving high thermoelectric performance. Herein, taking BiCuSeO superlattice as an example, it is demonstrated that efficient interlayer charge release can increase carrier concentration, thereby activating multiple Fermi pockets through Bi/Cu dual vacancies and Pb codoping. Experimental results reveal that the extrinsic charges, which are introduced by Pb and initially trapped in the charge-reservoir [Bi2O2]2+ sublayers, are effectively released into [Cu2Se2]2− sublayers via the channels bridged by Bi/Cu dual vacancies. This efficient interlayer charge release endows dual-vacancy- and Pb-codoped BiCuSeO with increased carrier concentration and electrical conductivity. Moreover, with increasing carrier concentration, the Fermi level is pushed down, activating multiple converged valence bands, which helps to maintain a relatively high Seebeck coefficient and yield an enhanced power factor. As a result, a high ZT value of ∼1.4 is achieved at 823 K in codoped Bi0.90Pb0.06Cu0.96SeO, which is superior to that of pristine BiCuSeO and solely doped samples. The present findings provide prospective insights into the exploration of high-performance thermoelectric materials and the underlying transport physics.

Cross-plane thermal conductivity temperature dependence for PbSnSe/PbSe thin film superlattice material from 100K to 300K

2013 ◽  
Vol 1456 ◽  
Author(s):  
James D. Jeffers ◽  
Leonard Olona ◽  
Zhihua Cai ◽  
Khosrow Namjou ◽  
Patrick J. McCann
Keyword(s):  
Thin Film ◽  
Thermal Conductivity ◽  
Quantum Wells ◽  
Temperature Dependence ◽  
Lattice Thermal Conductivity ◽  
Continuous Wave ◽  
Emission Spectra ◽  
Multiple Quantum ◽  
Element Analysis ◽  
Plane Lattice

ABSTRACTThe temperature dependence of cross-plane lattice thermal conductivity for thin film IV-VI semiconductors grown by molecular beam epitaxy was measured. Samples consisting of PbSe/PbSrSe multiple quantum wells (MQWs) on PbSe/PbSnSe superlattices (SLs) were grown with variations in SL layer thickness and the number of SL pairs. Localized lattice temperatures within the MQW layers were extracted from analysis of continuous wave photoluminescence (PL) emission spectra at heat sink temperatures between 100 K and 250 K. These data, finite element analysis, and electrical characterization were used to determine cross-plane lattice thermal conductivity of two different SL materials. A SL material with three different PbSe/PbSnSe thicknesses (1.2/1.2, 1.8/1.8, and 2.4/2.4 nm) exhibited a fairly constant lattice thermal conductivity from 1.2 to 1.3 W/mK as the sample was cooled from 250 K to 100 K. Another SL material with five different PbSe/PbSnSe thicknesses (0.5/0.5, 1.0/1.0, 1.6/1.6, 2.1/2.1, and 2.6/2.6 nm) exhibited very low lattice thermal conductivities from 0.46 to 0.47 W/mK 250 K to 100 K. These results are consistent with reflection of low energy heat transporting acoustic phonons within the SL material.

scholarly journals Ternary selenides A2Sb4Se8 (A = K, Rb and Cs) as an n-type thermoelectric material with high power factor and low lattice thermal conductivity: importance of the conformationally flexible Sb–Se–Se–Sb bridges

RSC Advances ◽  
2020 ◽  
Vol 10 (24) ◽  
pp. 14415-14421
Author(s):  
Changhoon Lee ◽  
Sujee Kim ◽  
Won-Joon Son ◽  
Ji-Hoon Shim ◽  
Myung-Hwan Whangbo
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Properties ◽  
Thermoelectric Material ◽  
Power Factor ◽  
High Power ◽  
High Performance ◽  
Lattice Thermal Conductivity ◽  
High Power Factor

The ternary selenides A2Sb4Se8 (A = K, Rb, Cs) are predicted to be a high-performance n-type thermoelectric material, and the conformationally-flexible Sb–Se(2)–Se(2)–Sb bridges are crucial in determining the thermoelectric properties of A2Sb4Se8.

scholarly journals Bonding Heterogeneity in Mixed-Anion Compounds Realizes Ultralow Lattice Thermal Conductivity

2021 ◽  
Author(s):  
Naoki Sato ◽  
Norihide Kuroda ◽  
Shun Nakamura ◽  
Yukari Katsura ◽  
Ikuzo Kanazawa ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Performance ◽  
Lattice Thermal Conductivity ◽  
Phonon Density ◽  
Phonon Density Of States ◽  
Crystalline Materials ◽  
Peak Splitting ◽  
Energy Applications ◽  
Scattering Phase ◽  
Similar Crystal Structure

<p><a>Crystalline materials with intrinsically low lattice thermal conductivity (</a><i>κ</i><sub>lat</sub>) pave the way towards high performance in various energy applications, including thermoelectrics. Here we demonstrate a strategy to realize ultralow <i>κ</i><sub>lat</sub> using mixed-anion compounds. Our calculations reveal that locally distorted structures in chalcohalides MnPnS<sub>2</sub>Cl (Pn = Sb, Bi) derives a bonding heterogeneity, which in turn causes a peak splitting of the phonon density of states. This splitting induces a large amount of scattering phase space. Consequently, <i>κ</i><sub>lat</sub> of MnPnS<sub>2</sub>Cl is significantly lower than that of a single-anion sulfide CuTaS<sub>3</sub> with a similar crystal structure. Experimental <i>κ</i><sub>lat</sub> of MnPnS<sub>2</sub>Cl takes an ultralow value of about 0.5 W m<sup>−1</sup> K<sup>−1</sup> at 300 K. Our findings will encourage the exploration of thermal transport in mixed-anion compounds, which remain a vast unexplored space, especially regarding unexpectedly low <i>κ</i><sub>lat</sub> in lightweight materials derived from the bonding heterogeneity.</p>

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