A material catalogue with glass-like thermal conductivity mediated by crystallographic occupancy for thermoelectric application

Abstract

Discovering materials with the intrinsically low lattice thermal conductivity κlat is an important route for achieving high thermoelectric performance. In reality, the conventional synthetic approach, however, relies on trial and...

Next-generation thermoelectric cooling modules based on high-performance Mg3(Bi,Sb)2 material

“…The efficiency of these modules is usually estimated by a dimensionless zT value of thermoelectric materials, zT = S 2 sT/(k l + k e ), where S is the Seebeck coefficient, s is the electrical conductivity, T is the temperature, and k l and k e are the lattice and electron thermal conductivities, respectively. Therefore, to enable the broad use of these modules in commercial and other critical fields, enormous efforts have been devoted to improving the zT value of materials, mainly by enhancing power factor (S 2 s) through the engineering of electronic structures [1][2][3][4][5] and charge carrier scattering [6][7][8] and reducing lattice thermal conductivity (k l ) by designing soft materials with complex crystal structures [9][10][11][12][13] or enhanced phonon scattering. 10,[14][15][16][17][18][19] However, the actual performance of thermoelectric modules cannot be predicted simply from the zT values of materials because it is governed by a variety of properties, including average thermoelectric properties, 20 mechanical properties, 21 thermal and chemical stabilities, 22,23 interfacial contact, and thermal resistances related to the barrier layers.…”

Glassy thermal conductivity in Cs3Bi2I6Cl3 single crystal

“…Crystalline materials in which κ L reaches this glass limit and exhibit glass-like temperature variation of κ L (κ L (T)) is extremely important for a variety of applications such as in thermoelectrics. Previously glass-like κ L has been observed in crystalline materials when they comprise large and complex unit cell 20 – 22 , incorporate large amount of disorder 23 and nanostructures 24 , 25 , or have specially designed layered modules 9 . However, the presence of disorder is often unwarranted as it deteriorates charge carrier transport.…”

Facile Fabrication of N-Type Flexible CoSb3-xTex Skutterudite/PEDOT:PSS Hybrid Thermoelectric Films

“…The efficiency of TE materials is described by a dimensionless figure of merit ZT = S 2 σTκ −1 , where S represents the Seebeck coefficient, σ represents electrical conductivity, κ represents thermal conductivity, and T represents absolute temperature. To improve the figure of merit, the majority of recent research is focused on two aspects: the enhancement of the power factor ( S 2 σ ) [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ] and the reduction in thermal conductivity κ [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ].…”