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

Title
Thermoelectric materials by using two-dimensional materials with negative correlation between electrical and thermal conductivity
Authors
Lee, Myoung JaeAhn, Ji-HoonSung, Ji HoHeo, HoseokJeon, Seong GiLee, WooSong, Jae YongHong, Ki-HaChoi, ByeongdaeLee, Sung-HoonJo, Moon-Ho
DGIST Authors
Lee, Myoung JaeChoi, Byeongdae
Issue Date
2016-06
Citation
Nature Communications, 7
Type
Article
Article Type
Article
ISSN
2041-1723
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://hdl.handle.net/20.500.11750/5103
DOI
10.1038/ncomms12011
Publisher
Nature Publishing Group
Related Researcher
Files:
Collection:
Intelligent Devices and Systems Research Group1. Journal Articles


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