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Temperature-sensitive spatial distribution of defects in PdSe2 flakes

Xiaowei Liu1, Yaojia Wang1, Qiqi Guo2, Shi-Jun Liang1, Tao Xu3, Bo Liu4, Jiabin Qiao2, Shengqiang Lai1, Junwen Zeng1 et al.

Song Hao1, Chenyi Gu5, Tianjun Cao1, Chenyu Wang1, Yu Wang1, Chen Pan1, Guangxu Su1, Yuefeng Nie5, Xiangang Wan1, Litao Sun3, Zhenlin Wang1, Lin He2,*, Bin Cheng1,6,†, and Feng Miao1,‡

  • 1National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 2Center for Advanced Quantum Studies, Department of Physics, Beijing Normal, University, Beijing 100875, China
  • 3SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University, Nanjing 210018, China
  • 4College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
  • 5National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 6Institute of Interdisciplinary Physical Sciences, School of Science, Nanjing University of Science and Technology, Nanjing 210094, China

  • *Corresponding author: helin@bnu.edu.cn
  • †Corresponding author: bincheng@njust.edu.cn
  • ‡Corresponding author: miao@nju.edu.cn
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Phys. Rev. Materials 5, L041001 – Published 28 April, 2021

DOI: https://doi.org/10.1103/PhysRevMaterials.5.L041001

Abstract

Defect engineering plays an important role in tailoring the electronic transport properties of van der Waals materials. However, it is usually achieved through tuning the type and concentration of defects, rather than dynamically reconfiguring their spatial distribution. Here, we report temperature-sensitive spatial redistribution of defects in PdSe2 thin flakes through scanning tunneling microscopy. We observe that the spatial distribution of Se vacancies in PdSe2 flakes exhibits a strong anisotropic characteristic at 80 K, and that this orientation-dependent feature is weakened when temperature is raised. Moreover, we carry out transport measurements on PdSe2 thin flakes and show that the anisotropic features of carrier mobility and phase coherent length are also sensitive to temperature. Combining with theoretical analysis, we conclude that temperature-driven defect spatial redistribution could interpret the temperature-sensitive electrical transport behaviors in PdSe2 thin flakes. Our work highlights that engineering spatial distribution of defects in the van der Waals materials, which has been overlooked before, may open up an avenue to tailor the physical properties of materials and explore different device functionalities.

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Two-Dimensional Materials and Devices

Physical Review Applied and Physical Review Materials are pleased to present the Collection on Two-dimensional Materials and Devices, highlighting one of the most interesting fields in Applied Physics and Materials Research. Papers belonging to this collection will be published throughout 2020. The invited articles, and an editorial by the Guest Editor, David Tománek, are linked below.

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Phys. Rev. Materials 5, L041001– Published 28 April, 2021
  • Received 26 November 2020
  • Revised 15 February 2021
  • Accepted 5 April 2021
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