摘要
Tellurene,probably one of the most promising two-dimensional(2D)system in the thermoelectric materials,displays ultra-low thermal conductivity.However,a linear thickness-dependent thermal conductivity of unique tellurium nanoribbons in this study reveals that unprecedently low thermal conductivity can be achieved via well-defined nanostructures of low-dimensional tellurium instead of pursuing dimension-reduced 2D tellurene.For thinnest tellurium nanoribbon with thickness of 144 nm,the thermal conductivity is only∼1.88±0.22 W·m^(−1)·K^(−1) at room temperature.It’s a dramatic decrease(45%),compared with the well-annealed high-purity bulk tellurium.To be more specific,an expected thermal conductivity of tellurium nanoribbons is even lower than that of 2D tellurene,as a result of strong phonon-surface scattering.We have faith in low-dimensional tellurium in which the thermoelectric performance could realize further breakthrough.
基金
The work was supported by the Key-Area Research and Development Program of Guangdong Province(No.2020B010190004)
the National Key R&D Program of China(No.2017YFB0406000)
the National Natural Science Foundation of China(Nos.11674245,51772219,11890703,and 11935010)
the Open Fund of Zhejiang Provincial Key Laboratory of Quantum Technology and Device(No.20190301)
the Zhejiang Provincial Natural Science Foundation of China(No.LZ18E030001).
