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Probing defect dynamics in monolayer MoS2 via noise nanospectroscopy
Seung Hyun Song1,2, Min-Kyu Joo1,2, Michael Neumann1,2
1Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon, 16419, Republic of Korea.
Nature Communications
|December 16, 2017
Summary
Researchers investigated sulfur monovacancy defects in molybdenum disulfide (MoS2) monolayers. They discovered these defects switch between charge states, explaining anomalies in MoS2 electronic properties.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Monolayer molybdenum disulfide (MoS2) is a promising material for next-generation electronics.
- Observed electrical properties of MoS2 monolayers, including low mobility and high contact resistance, remain anomalous.
- The role of defects in MoS2 electronic anomalies has been suspected but not mechanistically understood.
Purpose of the Study:
- To elucidate the ionization dynamics of sulfur monovacancy defects in monolayer MoS2.
- To establish a direct link between defect behavior and anomalous electronic properties.
- To explore the fundamental charge states of monovacancy defects.
Main Methods:
- Utilized noise nanospectroscopy, combining noise-current analysis with atomic force microscopy.
- Defined nanoscale in situ channels using atomic force microscopy tip for localized probing.
- Investigated the ionization dynamics of individual or few sulfur monovacancy defects.
Main Results:
- Sulfur monovacancy defects were observed to switch between three distinct ionization configurations.
- These configurations correspond to charge states 0, -1, and -2.
- The charge states 0 and -1 were identified as the most probable configurations.
Conclusions:
- The switching ionization dynamics of sulfur monovacancy defects provide a plausible mechanism for the anomalous electronic properties of MoS2 monolayers.
- Understanding these defect dynamics is crucial for optimizing MoS2-based electronic devices.
- This study offers new insights into defect physics in 2D materials.
