期刊
ACS NANO
卷 11, 期 8, 页码 8215-8222出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b03219
关键词
thermal conductivity; hybrid nanomembrane superlattice; strain-engineered rolling and compressing technique; silicon-based thermoelectrics; BvK lattice dynamics
类别
资金
- DFG [SPP 1386, 51471401]
- Cfaed SiNW path [85048411]
- Moldova government [15.817.02.29F]
- University of Houston
Silicon, although widely used in modern electronic devices, has not yet been implemented in thermoelectric applications mainly due to its high thermal conductivity, kappa, which leads to an extremely ldw thermoelectric energy conversion efficiency (figure of merit). Here, we present an approach to manage kappa of Si thin-film-based nanoarchitectures through the formation of radial and planar Si/SiOx hybrid nanomembrane superlattices (HNMSLs). For the radial Si/SiOx HNMSLs with various numbers of windings (1, 2, and 5 windings), we observe a continuous reduction in Ic with increasing number of windings. Meanwhile, the planar Si/SiOx HNMSL, which is fabricated by mechanically compressing a five windings, rolled-up microtube, shows the smallest in-plane thermal conductivity among all the reported values for Si-based superlattices. A theoretical model proposed within the framework of the Born von Karman lattice dynamics to quantitatively interpret the experimental data indicates that the thermal conductivity of Si/SiOx HNMSLs is to a great extent determined by the phonon processes in the SiOx layers.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据