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Journal article
Evolution of Metastable Defects and Its Effect on the Electronic Properties of MoS2 Films
Scientific reports, v 8(1), pp 1-10
30 Apr 2018
PMID: 29712931
Abstract
We report on structural and electronic properties of defects in chemical vapor-deposited monolayer and few-layer MoS
2
films. Scanning tunneling microscopy, Kelvin probe force microscopy, and transmission electron microscopy were used to obtain high resolution images and quantitative measurements of the local density of states, work function and nature of defects in MoS
2
films. We track the evolution of defects that are formed under heating and electron beam irradiation. We observe formation of metastable domains with different work function values after annealing the material in ultra-high vacuum to moderate temperatures. We attribute these metastable values of the work function to evolution of crystal defects forming during the annealing. The experiments show that sulfur vacancies formed after exposure to elevated temperatures diffuse, coalesce, and migrate bringing the system from a metastable to equilibrium ground state. The process could be thermally or e-beam activated with estimated energy barrier for sulfur vacancy migration of 0.6 eV in single unit cell MoS
2
. Even at equilibrium conditions, the work function and local density of states values are strongly affected near grain boundaries and edges. The results provide initial estimates of the thermal budgets available for reliable fabrication of MoS
2
-based integrated electronics and indicate the importance of defect control and layer passivation.
Metrics
Details
- Title
- Evolution of Metastable Defects and Its Effect on the Electronic Properties of MoS2 Films
- Creators
- M. Precner - Drexel UniversityT. Polaković - Drexel UniversityQiao Qiao - Brookhaven National LaboratoryD. J. Trainer - Temple UniversityA. V. Putilov - Temple UniversityC. Di Giorgio - Temple UniversityI. Cone - Temple UniversityY. Zhu - Brookhaven National LaboratoryX. X. Xi - Temple UniversityM. Iavarone - Temple UniversityG. Karapetrov - Drexel UniversityBrookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Details
- Scientific reports, v 8(1), pp 1-10
- Publisher
- Nature Publishing Group UK
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000431104900025
- Scopus ID
- 2-s2.0-85046269921
- Other Identifier
- 991019168024504721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary