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나노입자 연구단
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Enhancing p-Type Thermoelectric Performances of Polycrystalline SnSe via Tuning Phase Transition Temperature

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Title
Enhancing p-Type Thermoelectric Performances of Polycrystalline SnSe via Tuning Phase Transition Temperature
Author(s)
Yong Kyu Lee; Kyunghan Ahn; Joonil Cha; Chongjian Zhou; Hyo Seok Kim; Garam Choi; Sue In Chae; Jae-Hyuk Park; Sung-Pyo Cho; Sang Hyun Park; Yung-Eun Sung; Won Bo Lee; Taeghwan Hyeon; In Chung
Publication Date
2017-08
Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.139, no.31, pp.10887 - 10896
Publisher
AMER CHEMICAL SOC
Abstract
SnSe emerges as a new class of thermoelectric materials since the recent discovery of an ultrahigh thermoelectric figure of merit in its single crystals. Achieving such performance in the polycrystalline counterpart is still challenging and requires fundamental understandings of its electrical and thermal transport properties as well as structural chemistry. Here we demonstrate a new strategy of improving conversion efficiency of bulk polycrystalline SnSe thermoelectrics. We show that PbSe alloying decreases the transition temperature between Pnma and Cmcm phases and thereby can serve as a means of controlling its onset temperature. Along with 1% Na doping, delicate control of the alloying fraction markedly enhances electrical conductivity by earlier initiation of bipolar conduction while reducing lattice thermal conductivity by alloy and point defect scattering simultaneously. As a result, a remarkably high peak ZT of ∼1.2 at 773 K as well as average ZT of ∼0.5 from RT to 773 K is achieved for Na0.01(Sn1-xPbx)0.99Se. Surprisingly, spherical-aberration corrected scanning transmission electron microscopic studies reveal that NaySn1-xPbxSe (0 < x ≤ 0.2; y = 0, 0.01) alloys spontaneously form nanoscale particles with a typical size of ∼5-10 nm embedded inside the bulk matrix, rather than solid solutions as previously believed. This unexpected feature results in further reduction in their lattice thermal conductivity. © 2017 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4207
ISSN
0002-7863
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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