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강상관계 물질 연구단
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Polycrystalline SnSe with a thermoelectric figure of merit greater than the single crystal

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Title
Polycrystalline SnSe with a thermoelectric figure of merit greater than the single crystal
Author(s)
Zhou, Chongjian; Lee, Yong Kyu; Yu, Yuan; Sejin Byun; Luo, Zhong-Zhen; Hyungseok Lee; Ge, Bangzhi; Lee, Yea-Lee; Chen, Xinqi; Lee, Ji Yeong; Cojocaru-Mirédin, Oana; Chang, Hyunju; Im, Jino; Cho, Sung-Pyo; Wuttig, Matthias; Dravid, Vinayak P.; Kanatzidis, Mercouri G.; In Chung
Publication Date
2021-10
Journal
NATURE MATERIALS, v.20, no.10, pp.1378 - 1384
Publisher
Nature Research
Abstract
© 2021, The Author(s).Thermoelectric materials generate electric energy from waste heat, with conversion efficiency governed by the dimensionless figure of merit, ZT. Single-crystal tin selenide (SnSe) was discovered to exhibit a high ZT of roughly 2.2–2.6 at 913 K, but more practical and deployable polycrystal versions of the same compound suffer from much poorer overall ZT, thereby thwarting prospects for cost-effective lead-free thermoelectrics. The poor polycrystal bulk performance is attributed to traces of tin oxides covering the surface of SnSe powders, which increases thermal conductivity, reduces electrical conductivity and thereby reduces ZT. Here, we report that hole-doped SnSe polycrystalline samples with reagents carefully purified and tin oxides removed exhibit an ZT of roughly 3.1 at 783 K. Its lattice thermal conductivity is ultralow at roughly 0.07 W m–1 K–1 at 783 K, lower than the single crystals. The path to ultrahigh thermoelectric performance in polycrystalline samples is the proper removal of the deleterious thermally conductive oxides from the surface of SnSe grains. These results could open an era of high-performance practical thermoelectrics from this high-performance material.
URI
https://pr.ibs.re.kr/handle/8788114/10394
DOI
10.1038/s41563-021-01064-6
ISSN
1476-1122
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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