首页|Surface evolution of thermoelectric material KCu4Se3 explored by scanning tunneling microscopy

Surface evolution of thermoelectric material KCu4Se3 explored by scanning tunneling microscopy

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Novel two-dimensional thermoelectric materials have attracted significant attention in the field of thermoelectric due to their low lattice thermal conductivity.A comprehensive understanding of their microscopic structures is crucial for driving further the optimization of materials properties and developing novel functional materials.Here,by using in situ scanning tunneling microscopy,we report the atomic layer evolution and surface reconstruction on the cleaved thermoelec-tric material KCu4Se3 for the first time.We clearly revealed each atomic layer,including the naturally cleaved K atomic layer,the intermediate Se2-atomic layer,and the Se-atomic layer that emerges in the thermodynamic-stable state.De-parting from the majority of studies that predominantly concentrate on macroscopic measurements of the charge transport,our results reveal the coexistence of potassium disorder and complex reconstructed patterns of selenium,which potentially influences charge carrier and lattice dynamics.These results provide direct insight into the surface microstructures and evolution of KCu4Se3,and shed useful light on designing functional materials with superior performance.

thermoelectricKCu4Se3scanning tunneling microscopy(STM)evolution

夏玉敏、马妮、蔡德胜、刘宇舟、谷易通、于淦、霍思宇、庞文慧、肖翀、秦胜勇

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International Center for Quantum Design of Functional Materials(ICQD),Hefei National Laboratory for Physical Sciences at Microscale(HFNL),University of Science and Technology of China,Hefei 230026,China

CAS Key Laboratory of Strong Coupled Quantum Matter Physics,Department of Physics,University of Science and Technology of China,Hefei 230026,China

Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China

Institute of Energy,Hefei Comprehensive National Science Center,Hefei 230031,China

Dalian National Laboratory for Clean Energy.Chinese Academy of Sciences(CAS),Dalian 116023,China

Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaInnovation Program for Quantum Science and TechnologyCAS Project for Young Scientists in Basic ResearchFundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central UniversitiesFund of Anhui Initiative in Quantum Information TechnologiesUniversity Synergy Innovation Program of Anhui Province,ChinaNational Synchrotron Radiation Laboratory Joint Funds of University of Science and Technology of China

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2024

10.1088/1674-1056/ad50c4

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(8)