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Tailoring thermal conductivity by engineering com- positional gradients in Sil-xGex superlattices
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作者 Pablo Ferrando-Villalba1 Aitor F. Lopeandia +8 位作者 Francesc Xavier Alvarez Biplab Paul carla detomas Maria Isabel Alonso Miquel Garriga Alejandro R. Goni Jose Santiso Gemma Garcia Javier Rodriguez-Viejo 《Nano Research》 SCIE EI CAS CSCD 2015年第9期2833-2841,共9页
The transport properties of artificially engineered superlattices (SLs) can be tailored by incorporating a high density of interfaces in them. Specifically, SiGe SLs with low thermal conductivity values have great p... The transport properties of artificially engineered superlattices (SLs) can be tailored by incorporating a high density of interfaces in them. Specifically, SiGe SLs with low thermal conductivity values have great potential for thermoelectric generation and nano-cooling of Si-based devices. Here, we present a novel approach for customizing thermal transport across nanostructures by fabricating Si/Sil-xGex SLs with well-defined compositional gradients across the SiGe layer from x = 0 to 0.60. We demonstrate that the spatial inhomogeneity of the structure has a remarkable effect on the heat-flow propagation, reducing the thermal conductivity to -2.2 W.m-1.K-1, which is significantly less than the values achieved previously with non-optimized long-period SLs. This approach offers further possibilities for future applications in thermoelectricity. 展开更多
关键词 SIGE supeflattices thermal conductivity composition gradients heat transport
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