Abstract
Researchers have long been searching for the materials to enhance thermoelectric performance in terms of nano scale approach in order to realize phonon-glass-electron-crystal and quantum confinement effects. Peierls distortion can be a pathway to enhance thermoelectric figure-of-merit ZT by employing natural nano-wire-like electronic and thermal transport. The phonon-softening known as Kohn anomaly, and Peierls lattice distortion decrease phonon energy and increase phonon scattering, respectively, and, as a result, they lower thermal conductivity. The quasi-one-dimensional electrical transport from anisotropic band structure ensures high Seebeck coefficient in Indium Selenide. The routes for high ZT materials development of In4Se3−δ are discussed from quasi-one-dimensional property and electronic band structure calculation to materials synthesis, crystal growth, and their thermoelectric properties investigations. The thermoelectric properties of In4Se3−δ can be enhanced by electron doping, as suggested from the Boltzmann transport calculation. Regarding the enhancement of chemical potential, the chlorine doped In4Se3−δCl0.03 compound exhibits high ZT over a wide temperature range and shows state-of-the-art thermoelectric performance of ZT = 1.53 at 450 °C as an n-type material. It was proven that multiple elements doping can enhance chemical potential further. Here, we discuss the recent progress on the enhancement of thermoelectric properties in Indium Selenides by increasing chemical potential.
Highlights
The global energy crisis makes an issue for a development of the new eco-friendly energy sources and the efficient consumption of the energies currently in use
We proposed the possible application of Peierls distortion into the thermoelectricity
As a candidate material of quasi 1D systems, In4Se3 is very promising because it has natural nanowire-like cylindrical clusters and quasi-one-dimensional Indium chains at the cleavage (100) surface from the scanning tunneling microscopy (STM) measurements [16,17,18]
Summary
The global energy crisis makes an issue for a development of the new eco-friendly energy sources and the efficient consumption of the energies currently in use. They argued that the quantum-well superlattice structure may have high thermoelectric performance by the low dimensional electronic transport and phonon interface scattering [1]. They observed the enhancement of power factor for the thickness controlled PbTe/Pb1−xEuxTe multiple quantum well structures [2]. It was suggested that the layered structure of disordered two dimensional crystalline sheets may have extremely low thermal conductivity [6] From this point, we proposed the possible application of Peierls distortion into the thermoelectricity. We review the recent progress on the Indium Selenide based compounds and the efforts to increase chemical potential in order to increase ZT value
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