Nanomagnetism Triggering Carriers Double‐Resistance Conduction and Excellent Flexible Thermoelectrics
Abstract
AbstractNanomagnetism may enable electrical conductivity and Seebeck coefficient to be decoupled and can potentially lead to remarkable enhancements in thermoelectric (TE) performance, however, their physical mechanisms have not been explored. Herein, it is shown that the nanomagnetism from Fe and Fe3O4 nanoparticles embedded in Bi0.5Sb1.5Te3/epoxy flexible films can lead to the carriers splitting into spin‐up and spin‐down conductive branches with different resistances and mobilities due to the exchange interaction between the spin of carriers and the nanomagnetism. The double‐resistance conduction of carriers may well explain the decoupling of electrical conductivity and Seebeck coefficient and their simultaneous enhancements in the thermo‐electro‐magnetic flexible films. It is further shown that the maximum dimensionless figure of merit of the thermo‐electro‐magnetic flexible films reaches between 1.2 and 1.4 at room temperature, and their five‐level cascaded device based on the films achieves a temperature drop of 3.1 K through in‐plane heat dissipation, making a new record for printing flexible TE films and devices. The double‐resistance conduction of carriers also reveals a deep physical mechanism for magneto‐enhanced TE performance of bulk thermoelectrics.
Article Details
Authors (18)
Shaoqiu Ke
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology Wuhan 430070 China
Xiaolei Nie
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei 430070 China
Ping Wei
Longzhou Li
Chengshan Liu
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology Wuhan 430070 China
Wenjie Xu
Tiantian Chen
Dong Liang
Xianfeng Ye
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology Wuhan 430070 China
Wan‐Ting Zhu
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology Wuhan 430070 China
Danqi He
Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of Technology Wuhan Hubei 430070 China
Mingrui Liu
College of New Energy, State Key Laboratory of Heavy Oil Processing
Jianjun Ying
Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics
Yimin Chao
Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu 528000 China
Wen‐Yu Zhao
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology Wuhan 430070 China
Jing Shi
Xianhui Chen
Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics
Qingjie Zhang
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing