3D Imaging and Manipulation of Subsurface Selenium Vacancies in
Abstract
Two-dimensional materials such as layered transition-metal dichalcogenides (TMDs) are ideal platforms for studying defect behaviors, an essential step towards defect engineering for novel material functions. Here, we image the 3D lattice locations of selenium-vacancy VSe defects and manipulate them using a scanning tunneling microscope (STM) near the surface of PdSe2, a recently discovered pentagonal layered TMD. The VSe show a characterisitc charging ring in a spatially resolved conductance map, based on which we can determine its subsurface lattice location precisely. Using the STM tip, not only can we reversibly switch the defect states between charge neutral and charge negative, but also trigger migrations of VSe defects. This allows a demonstration of direct “writing” and “erasing” of atomic defects and tracing the diffusion pathways. First-principles calculations reveal a small diffusion barrier of VSe in PdSe2, which is much lower than S vacancy in MoS2 or an O vacancy in TiO2. As a result, this finding opens an opportunity of defect engineering in PdSe2 for such as controlled phase transformations and resistive-switching memory device application.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Nanyang Technological Univ. (Singapore)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1484990
- Alternate Identifier(s):
- OSTI ID: 1465233
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 8; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS
Citation Formats
Nguyen, Giang D., Liang, Liangbo, Zou, Qiang, Fu, Mingming, Oyedele, Akinola D., Sumpter, Bobby G., Liu, Zheng, Gai, Zheng, Xiao, Kai, and Li, An -Ping. 3D Imaging and Manipulation of Subsurface Selenium Vacancies in PdSe2. United States: N. p., 2018.
Web. doi:10.1103/PhysRevLett.121.086101.
Nguyen, Giang D., Liang, Liangbo, Zou, Qiang, Fu, Mingming, Oyedele, Akinola D., Sumpter, Bobby G., Liu, Zheng, Gai, Zheng, Xiao, Kai, & Li, An -Ping. 3D Imaging and Manipulation of Subsurface Selenium Vacancies in PdSe2. United States. https://doi.org/10.1103/PhysRevLett.121.086101
Nguyen, Giang D., Liang, Liangbo, Zou, Qiang, Fu, Mingming, Oyedele, Akinola D., Sumpter, Bobby G., Liu, Zheng, Gai, Zheng, Xiao, Kai, and Li, An -Ping. Mon .
"3D Imaging and Manipulation of Subsurface Selenium Vacancies in PdSe2". United States. https://doi.org/10.1103/PhysRevLett.121.086101. https://www.osti.gov/servlets/purl/1484990.
@article{osti_1484990,
title = {3D Imaging and Manipulation of Subsurface Selenium Vacancies in PdSe2},
author = {Nguyen, Giang D. and Liang, Liangbo and Zou, Qiang and Fu, Mingming and Oyedele, Akinola D. and Sumpter, Bobby G. and Liu, Zheng and Gai, Zheng and Xiao, Kai and Li, An -Ping},
abstractNote = {Two-dimensional materials such as layered transition-metal dichalcogenides (TMDs) are ideal platforms for studying defect behaviors, an essential step towards defect engineering for novel material functions. Here, we image the 3D lattice locations of selenium-vacancy VSe defects and manipulate them using a scanning tunneling microscope (STM) near the surface of PdSe2, a recently discovered pentagonal layered TMD. The VSe show a characterisitc charging ring in a spatially resolved conductance map, based on which we can determine its subsurface lattice location precisely. Using the STM tip, not only can we reversibly switch the defect states between charge neutral and charge negative, but also trigger migrations of VSe defects. This allows a demonstration of direct “writing” and “erasing” of atomic defects and tracing the diffusion pathways. First-principles calculations reveal a small diffusion barrier of VSe in PdSe2, which is much lower than S vacancy in MoS2 or an O vacancy in TiO2. As a result, this finding opens an opportunity of defect engineering in PdSe2 for such as controlled phase transformations and resistive-switching memory device application.},
doi = {10.1103/PhysRevLett.121.086101},
journal = {Physical Review Letters},
number = 8,
volume = 121,
place = {United States},
year = {Mon Aug 20 00:00:00 EDT 2018},
month = {Mon Aug 20 00:00:00 EDT 2018}
}
Web of Science
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