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Materials 2015, 8(3), 1283-1324; doi:10.3390/ma8031283

Chemical Potential Tuning and Enhancement of Thermoelectric Properties in Indium Selenides

Department of Applied Physics, Kyung Hee University, Yong-In 446-701, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Kunihito Koumoto
Received: 25 January 2015 / Revised: 10 March 2015 / Accepted: 11 March 2015 / Published: 20 March 2015
(This article belongs to the Special Issue Low-Dimensional Anisotropic Thermoelectrics)

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 In4Se3δ 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 In4Se3δ can be enhanced by electron doping, as suggested from the Boltzmann transport calculation. Regarding the enhancement of chemical potential, the chlorine doped In4Se3δCl0.03 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. View Full-Text
Keywords: thermoelectric; Peierls distortion; Indium Selenides; charge density wave; chemical potential thermoelectric; Peierls distortion; Indium Selenides; charge density wave; chemical potential
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rhyee, J.-S.; Kim, J.H. Chemical Potential Tuning and Enhancement of Thermoelectric Properties in Indium Selenides. Materials 2015, 8, 1283-1324.

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