Kaur Yashpreet, Tachikawa Saeko, Swinkels Milo Yaro, López-Suárez Miquel, Camponovo Matteo, Ruiz Caridad Alicia, Kim Wonjong, Fontcuberta I Morral Anna, Rurali Riccardo, Zardo Ilaria
Department of Physics, Universität Basel, Basel 4056, Switzerland.
Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, Bellaterra 08193, Spain.
ACS Appl Mater Interfaces. 2025 Jan 8;17(1):1883-1891. doi: 10.1021/acsami.4c14920. Epub 2024 Dec 18.
A thermal diode, which, by analogy to its electrical counterpart, rectifies heat current, is the building block for thermal circuits. To realize a thermal diode, we demonstrate thermal rectification in a GaAs telescopic nanowire system using the thermal bridge method. We measured a preferred direction of heat flux, achieving rectification values ranging from 2 to 8% as a function of applied thermal bias. We demonstrate that the thermal boundary resistance between the thin part with the wurtzite crystal phase and the thick part with the zinc-blende crystal phase of the telescopic nanowire plays a crucial role in determining the amount and direction of heat flux rectification. This effect is confirmed by numerical solutions of the one-dimensional heat equation based on ab initio data. Additionally, we accounted for the effect of the thermal contact resistance. This work is the first experimental indication of rectification using a telescopic nanowire where we reveal the importance and role of the thermal boundary resistance in determining thermal rectification.
热二极管类似于其电学对应物，能对热流进行整流，是热电路的基本组成部分。为了实现热二极管，我们利用热桥法在砷化镓伸缩纳米线系统中展示了热整流。我们测量了热流的优先方向，作为施加的热偏置的函数，实现了2%至8%的整流值。我们证明，伸缩纳米线中具有纤锌矿晶体相的薄部分与具有闪锌矿晶体相的厚部分之间的热边界电阻在确定热流整流的量和方向方面起着关键作用。基于从头算数据的一维热方程的数值解证实了这一效应。此外，我们还考虑了热接触电阻的影响。这项工作是首次使用伸缩纳米线进行整流的实验表明，我们揭示了热边界电阻在确定热整流中的重要性和作用。
