Interfacial thermal transport plays a prominent role in the thermal management of nanoscale objects and is of fundamental importance for basic research and nanodevices. At metal/insulator interfaces, a configuration commonly found in electronic devices, heat transport strongly depends upon the effective energy transfer from thermalized electrons in the metal to the phonons in the insulator.
However, the mechanism of interfacial electron–phonon coupling and thermal transport at metal/insulator interfaces is not well understood.Here, the observation of a substantial enhancement of the interfacial thermal resistance and the important role of surface charges at the metal/ferroelectric interface in an Al/BiFeO3 membrane are reported. By applying uniaxial strain, the interfacial thermal resistance can be varied substantially (up to an order of magnitude), which is attributed to the renormalized interfacial electron–phonon coupling caused by the charge redistribution at the interface due to the polarization rotation. These results imply that surface charges at a metal/insulator interface can substantially enhance the interfacial electron–phonon-mediated thermal coupling, providing a new route to optimize the thermal transport performance in next-generation nanodevices, power electronics, and thermal logic devices.
Sustainable energy conversion & storage systems
Giant Thermal Transport Tuning at a Metal/Ferroelectric Interface
Yipeng Zang, Chen Di, Zhiming Geng, Xuejun Yan, Dianxiang Ji, Ningchong Zheng, Xingyu Jiang, Hanyu Fu, Jianjun Wang, Wei Guo, Haoying Sun, Lu Han, Yunlei Zhou, Zhengbin Gu, Desheng Kong, Hugo Aramberri, Claudio Cazorla, Jorge Íñiguez, Riccardo Rurali, Longqing Chen, Jian Zhou, Di Wu, Minghui Lu, Yuefeng Nie, Yanfeng Chen, Xiaoqing Pan
Optimization of a new system for organic solar cells is a multiparametric analysis problem which requires substantial efforts in terms of time and resources. The strong microstructure dependent performance of polymer:olymer cells makes them particularly difficult to optimize, or to translate previous knowledge from spin coating into more scalable techniques.
The development of high energy density battery technologies based on divalent metals as the negative electrode is very appealing. Ca and Mg are especially interesting choices due to their combination of low standard reduction potential and natural abundance.
The global energy demand continues to grow both due to the increasing population and wealth. As one of the potential solutions, renewable energy resources can relieve the pressure on conventional energy sources. However, due to fluctuations in both supply and demand, they need to be complemented with load-leveling technologies.
We present a method to dissolve carbon nanotubes that simultaneously allows to prepare n-doped films. These films are composed of thinner bundles of longer tubes when compared to films prepared using surfactants and sonication.
Conspectus Over the past 30 years, the engineering of plasmonic resonances at the nanoscale has progressed dramatically, with important contributions in a variety of different fields, including chemistry, physics, biology, engineering, and medicine. However, heavy optical losses related to the use of noble metals for the fabrication of plasmonic structures hindered their application in various settings.