An electrochemical thermal transistor

作     者：Sood, Aditya Xiong, Feng Chen, Shunda Wang, Haotian Selli, Daniele Zhang, Jinsong McClellan, Connor J. Sun, Jie Donadio, Davide Cui, Yi Pop, Eric Goodson, Kenneth E. 

作者机构：Department of Materials Science and Engineering Stanford University StanfordCA94305 United States Department of Mechanical Engineering Stanford University StanfordCA94305 United States Department of Electrical Engineering Stanford University StanfordCA94305 United States Department of Chemistry University of California DavisCA95616 United States Max Planck Institute for Polymer Research Ackermannweg 10 MainzD-55128 Germany Ikerbasque Basque Foundation for Science BilbaoE-48011 Spain Stanford Institute for Materials and Energy Science SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Precourt Institute for Energy Stanford University StanfordCA94305 United States Department of Electrical and Computer Engineering University of Pittsburgh PittsburghPA15261 United States Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Dipartimento di Scienza dei Materiali Universita di Milano-Bicocca Milano20125 Italy School of Chemical Engineering and Technology Tianjin University Tianjin300350 China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2019年

核心收录：

主　　题：Layered semiconductors 

摘      要：The ability to actively regulate heat flow at the nanoscale could be a game changer for applications in thermal management and energy harvesting. Such a breakthrough could also enable the control of heat flow using thermal circuits, in a manner analogous to electronic circuits. Here we demonstrate switchable thermal transistors with an order of magnitude thermal on/off ratio, based on reversible electrochemical lithium intercalation in MoS2 thin films. We use spatially-resolved time-domain thermoreflectance to map the lithium ion distribution during device operation, and atomic force microscopy to show that the lithiated state correlates with increased thickness and surface roughness. First principles calculations reveal that the thermal conductance modulation is due to phonon scattering by lithium rattler modes, c-axis strain, and stacking disorder. This study lays the foundation for electrochemically-driven nanoscale thermal regulators, and establishes thermal metrology as a useful probe of spatio-temporal intercalant dynamics in nanomaterials. Copyright © 2019, The Authors. All rights reserved.