功勋
塞贝克系数
材料科学
热电材料
热导率
热电效应
电阻率和电导率
纳米尺度
缩放比例
凝聚态物理
电导率
热传导
热的
声子散射
热电发电机
光电子学
纳米技术
复合材料
热力学
物理
数学
几何学
量子力学
作者
Myoung-Jae Lee,Ji‐Hoon Ahn,Ji Ho Sung,Heeok Heo,Seong Gi Jeon,Woo Lee,Jae Yong Song,Ki‐Ha Hong,Byeongdae Choi,Sung-Hoon Lee,Moon‐Ho Jo
摘要
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.
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