Peierls distortion as a route to high thermoelectric performance in In 4Se3-) crystals

Jong Soo Rhyee, Kyu Hyoung Lee, Sang Mock Lee, Eunseog Cho, Sang Il Kim, Eunsung Lee, Yong Seung Kwon, Ji Hoon Shim, Gabriel Kotliar

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Abstract

Thermoelectric energy harvestingthe transformation of waste heat into useful electricityis of great interest for energy sustainability. The main obstacle is the low thermoelectric efficiency of materials for converting heat to electricity, quantified by the thermoelectric figure of merit, ZT. The best available n-type materials for use in mid-temperature (500-900K) thermoelectric generators have a relatively low ZT of 1 or less, and so there is much interest in finding avenues for increasing this figure of merit. Here we report a binary crystalline n-type material, In"4Se(3-), which achieves the ZT value of 1.48 at 705Kvery high for a bulk material. Using high-resolution transmission electron microscopy, electron diffraction, and first-principles calculations, we demonstrate that this material supports a charge density wave instability which is responsible for the large anisotropy observed in the electric and thermal transport. The high ZT value is the result of the high Seebeck coefficient and the low thermal conductivity in the plane of the charge density wave. Our results suggest a new direction in the search for high-performance thermoelectric materials, exploiting intrinsic nanostructural bulk properties induced by charge density waves.

Original languageEnglish
Pages (from-to)965-968
Number of pages4
JournalNature
Volume459
Issue number7249
DOIs
Publication statusPublished - 2009 Jun 18

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Rhyee, J. S., Lee, K. H., Lee, S. M., Cho, E., Kim, S. I., Lee, E., Kwon, Y. S., Shim, J. H., & Kotliar, G. (2009). Peierls distortion as a route to high thermoelectric performance in In 4Se3-) crystals. Nature, 459(7249), 965-968. https://doi.org/10.1038/nature08088