journal article·2021-07-21

Optimized Electronic Bands and Ultralow Lattice Thermal Conductivity in Ag and Y Codoped SnTe

Wenjing Xu, Hengquan Yang, Chengyan Liu, Zhongwei Zhang, Chunguang Chen, Zhenyuan Ye, Zhao Lu, Xiaoyang Wang, Jie Gao, Junliang Chen, Zhengchuan Xie, Lei Miao

ACS Applied Materials & Interfaces· Volume 13· Issue 28
Publisher page

Abstract

As a lead-free thermoelectric material, SnTe is inhibited by its inherent high carrier concentration and high thermal conductivity. This work describes the synergistic effect on the modulation of band structure and microstructural defects of SnTe by Ag and Y codoping, which gives rise to band convergence and multiple microstructural defects (secondary phases, dislocations, and boundaries) in the matrix and endows Sn0.94Ag0.09Y0.05Te with an increased power factor of ∼2485 μW m–1 K–2, an extremely low lattice thermal conductivity of ∼0.61 W m–1 K–1, and a peak zT as high as ∼1.2 at 873 K. This work reveals that the combination of Ag and Y could play a role in the synergistic optimization of electronic and phonon transport properties of SnTe by modifying the band structure and microstructures, providing guidance for enhancing the thermoelectric performance of the relevant materials.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Guangxi Key Laboratory of Information Material, Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, P. R. China

School of Physics and Electronic & Electrical Engineering, and Jiangsu Key Laboratory of Modern Measurement Technology and Intelligent Systems, Huaiyin Normal University, Huai’an 223300, P. R. China

School of Chemistry and Chemical Engineering & School of Physical Science and Technology, Guangxi University, Nanning 530004, P. R. China

Department of Materials Science and Engineering, SIT Research Laboratories, Innovative Global Program, Faculty of Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan

Funding

Ministry of Science and Technology of the People's Republic of China · Natural Science Foundation of Guangxi Province · National Natural Science Foundation of China · Innovation Project of GUET Graduate Education · Guangxi Science and Technology Project · Guangxi Key Laboratory of Information Materials

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