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

Myoung-Jae Lee (), Ji-Hoon Ahn, Ji Ho Sung, Hoseok Heo, Seong Gi Jeon, Woo Lee, Jae Yong Song, Ki-Ha Hong, Byeongdae Choi, Sung-Hoon Lee and Moon-Ho Jo ()
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Myoung-Jae Lee: Daegu Gyeongbuk Institute of Science and Technology (DGIST)
Ji-Hoon Ahn: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
Ji Ho Sung: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
Hoseok Heo: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
Seong Gi Jeon: Korea Advanced Institute of Science and Technology (KAIST)
Woo Lee: Korea Research Institute of Standards and Science (KRISS)
Jae Yong Song: Korea Research Institute of Standards and Science (KRISS)
Ki-Ha Hong: Hanbat National University
Byeongdae Choi: Daegu Gyeongbuk Institute of Science and Technology (DGIST)
Sung-Hoon Lee: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
Moon-Ho Jo: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms12011

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