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Thermoelectric materials by using two-dimensional materials with negative correlation between electrical and thermal conductivity

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Title
Thermoelectric materials by using two-dimensional materials with negative correlation between electrical and thermal conductivity
Author(s)
Myoung-Jae Lee; Ji-Hoon Ahn; Ji Ho Sung; Hoseok Heo; Jeon S.G.; Lee W.; Song J.Y.; Hong K.-H.; Choi B.; Sung-Hoon Lee; Moon-Ho Jo
Publication Date
2016-06
Journal
NATURE COMMUNICATIONS, v.7, no., pp.12011 -
Publisher
NATURE PUBLISHING GROUP
Abstract
In general, in thermoelectric materials the electrical conductivity σ and thermal conductivity κ are related and thus cannot be controlled independently. Previously, to maximize the thermoelectric figure of merit in state-of-the-art materials, differences in relative scaling between σ and κ as dimensions are reduced to approach the nanoscale were utilized. Here we present an approach to thermoelectric materials using tin disulfide, SnS2, nanosheets that demonstrated a negative correlation between σ and κ. In other words, as the thickness of SnS2 decreased, σ increased whereas κ decreased. This approach leads to a thermoelectric figure of merit increase to 0.13 at 300 K, a factor ~1,000 times greater than previously reported bulk single-crystal SnS2. The Seebeck coefficient obtained for our two-dimensional SnS2 nanosheets was 34.7 mV K-1 for 16-nm-thick samples at 300 K
URI
http://pr.ibs.re.kr/handle/8788114/2897
DOI
10.1038/ncomms12011
ISSN
2041-1723
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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