期刊
NANO ENERGY
卷 78, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105261
关键词
Thermal rectification; Thermal switch; Raman thermometry; Thermal diode; High temperatures; Thermoelectrics
类别
资金
- Polish National Science Centre [Sonata UMO-2018/31/D/ST3/03882, Preludium UMO-2019/33/N/ST5/02902]
- Foundation for Polish Science [POIR.04.04.00-00-5D1B/18]
- CERCA programme/Generalitat de Catalunya
- Severo Ochoa Centres of Excellence programme - Spanish Research Agency (AEI) [SEV-2017-0706]
- Spanish MICINN project SIP [PGC2018-101743-B-I00]
A thermal rectifier/diode is a nonreciprocal element or system that enables preferential heat transport in one direction. In this work we demonstrate a single-material thermal diode operating at high temperatures. The diode is made of nanostructured silicon membranes exhibiting spatially and temperature-dependent thermal conductivity and, therefore, falling into the category of spatially asymmetric, nonlinear nonreciprocal systems. We used an all-optical state-of-the-art experimental technique to prove rectification along rigorous criteria of the phenomenon. Using sub-milliwatt power we achieve rectification of about 14%. In addition, we demonstrate air-triggered thermal switching and passive cooling. Our findings provide a CMOS-compatible platform for heat rectification and applications in energy harvesting, thermal insulation and cooling, as well as sensing and potentially thermal logic.
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