Dynamic Phase Transition Leading to Extraordinary Plastic Deformability of Thermoelectric SnSe2 Single Crystal
Advanced Energy Materials, vol. 13
Abstract
Abstract Plastic/ductile inorganic van der Waals (vdW) thermoelectric semiconductors offer transformative advantages for high‐performance flexible thermoelectric devices, which can displace the self‐charge system of wearable electronics. However, the chemical origin of their plasticity remains unclear. Here, it is reported that the exceptionally large plastic strain of the bulk SnSe2 crystal results from its polytype conversion under an external force. The SnSe2 single crystal consists of a large‐period polytype with 18R low‐symmetry structure rather than the trigonal and hexagonal‐phase that are frequently observed in the polycrystalline specimen. In situ applied pressure to the specimen drives a phase transition from low to high‐symmetry, that is, from 18R to 4H, and finally to 2H‐SnSe2. First principle calculations corroborate that the dynamic phase transition is a pressure‐activated process and only 15 MPa pressure erases their energy gaps, consistent with experimentally measured strain–stress curves. This dynamic phase transition results in superior and near isotropic plasticity along the direction parallel and perpendicular to the cleavage plane.
Authors 13
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Northwestern Polytechnical University · State Key Laboratory of Solidification Processing · Xi'an Jiaotong University · Ministry of Industry and Information Technology
Affiliation as printed
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
State Key Laboratory of Solidification Processing and Key Laboratory of Radiation Detection Materials and Devices Ministry of Industry and Information Technology Northwestern Polytechnical University Xi'an 710072 China
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049 China
State Key Laboratory of Solidification Processing, and Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, 710072 China
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China Electronic Product Reliability and Environmental Test Institute · Ministry of Industry and Information Technology
Affiliation as printed
The Fifth Electronics Research Institute of Ministry of Industry and Information Technology Guangzhou 510006 China
The Fifth Electronics Research Institute of Ministry of Industry and Information Technology, Guangzhou, 510006 China
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Affiliation as printed
Institute of Advanced Semiconductors and Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices Hangzhou Innovation Center Zhejiang University Hangzhou 311200 China
Institute of Advanced Semiconductors and Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices, Hangzhou Innovation Center, Zhejiang University, Hangzhou, 311200 China
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Northwestern Polytechnical University · State Key Laboratory of Solidification Processing · Ministry of Industry and Information Technology
Affiliation as printed
State Key Laboratory of Solidification Processing and Key Laboratory of Radiation Detection Materials and Devices Ministry of Industry and Information Technology Northwestern Polytechnical University Xi'an 710072 China
State Key Laboratory of Solidification Processing, and Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, 710072 China
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Northwestern Polytechnical University · State Key Laboratory of Solidification Processing · Ministry of Industry and Information Technology
Affiliation as printed
State Key Laboratory of Solidification Processing and Key Laboratory of Radiation Detection Materials and Devices Ministry of Industry and Information Technology Northwestern Polytechnical University Xi'an 710072 China
State Key Laboratory of Solidification Processing, and Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, 710072 China
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University of Electronic Science and Technology of China
Affiliation as printed
Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China 610054 Chengdu China
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, 610054 Chengdu, China
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Affiliation as printed
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049 China
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Affiliation as printed
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049 China
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Affiliation as printed
Institute of Physics (IA) RWTH Aachen University 52056 Aachen Germany
Institute of Physics (IA), RWTH Aachen University, 52056 Aachen, Germany
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Chongjian Zhou corresponding
Northwestern Polytechnical University · State Key Laboratory of Solidification Processing · Ministry of Industry and Information Technology
Affiliation as printed
State Key Laboratory of Solidification Processing and Key Laboratory of Radiation Detection Materials and Devices Ministry of Industry and Information Technology Northwestern Polytechnical University Xi'an 710072 China
State Key Laboratory of Solidification Processing, and Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, 710072 China
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Menghua Zhu corresponding
Northwestern Polytechnical University · State Key Laboratory of Solidification Processing · Ministry of Industry and Information Technology
Affiliation as printed
State Key Laboratory of Solidification Processing and Key Laboratory of Radiation Detection Materials and Devices Ministry of Industry and Information Technology Northwestern Polytechnical University Xi'an 710072 China
State Key Laboratory of Solidification Processing, and Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, 710072 China
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Institute of Physics (IA) RWTH Aachen University 52056 Aachen Germany
Peter Grünberg Institut (PGI 10) Forschungszentrum Jülich 52425 Jülich Germany
Institute of Physics (IA), RWTH Aachen University, 52056 Aachen, Germany
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Affiliation as printed
Institute of Physics (IA) RWTH Aachen University 52056 Aachen Germany
Institute of Physics (IA), RWTH Aachen University, 52056 Aachen, Germany
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