Maximizing phonon scattering efficiency by Cu₂Se alloying in AgCuTe thermoelectric materials

Abstract

Nanoengineering has always been an effective way to optimize thermoelectric materials. Multi-layered nanostructures can maximize the phonon scattering efficiency and greatly reduce the thermal conductivity, thus improving the thermoelectric performance....

Stepwise Alloying in Liquid-like Solid Solutions to Achieve Crystallographic Distortion for Regulating Thermoelectric Transport Behavior

“…25,34 As depicted in Figure 5(a), within this fully random compositional distribution, lattice distortion and Moire fringes were induced by the difference in ionic radii and the lattice mismatches accompanying edge dislocations, which can be visually comprehensible in Figure 5(b,c). 35 The SAED and HRTEM images in Figure 5b could be indexed to an FCC structure along the [1-1-1] zone axis. The interplanar distance of the nanoparticles in Figure 5b is 0.43 nm, which corresponds to the (0−11) in cubic SnSe (PDF#89-4781).…”

Enhanced thermoelectric performance of In-doped and AgCuTe-alloyed SnTe through band engineering and endotaxial nanostructures

“…The production process for AgCuTe was the same with the previous reports. 32 The crystal structures of all samples were characterized by X-ray diffraction (XRD) using Cu K a radiation. Transmission electron microscopy (TEM, JEM-F200, JEOL Co., Ltd), Field emission scanning electron microscopy (FESEM, JSM-7001F, JEOL Co., Ltd), and energy dispersive spectroscopy were used to observe the microstructure of the samples and the analyzed composition and element distribution.…”

Achieving Ultralow Lattice Thermal Conductivity and High Thermoelectric Performance in SnTe by Alloying with MnSb2Se4

“…Our need for clean energy is more urgent right now due to a scarcity of resources and pollution produced by the usage of fossil fuels. Thermoelectric (TE) technology, which enables direct conversion of heat and electricity without the use of moving components or the generation of greenhouse gases, has attracted a lot of interest. , The performance of a TE material can be determined by the Seebeck coefficient S , electrical conductivity σ, absolute temperature T , and thermal conductivity κ (including electronic thermal conductivity κ e and lattice thermal conductivity κ L ), which together give rise to the dimensionless figure of merit ZT = S 2 σ T /κ. − All transport parameters, with the exception of phonon-related κ L , are strongly correlated by carrier concentration . Electronic structure modification, such as band engineering to enhance power factor, or the inclusion of extrinsic defects by alloying and nanostructuring to lower lattice thermal conductivity, are traditional techniques to improving ZT . , …”