期刊
NANO RESEARCH
卷 11, 期 8, 页码 4123-4132出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-018-1999-7
关键词
chemical vapor deposition (CVD) MoS2; hydrogen; sulfur vacancy; defect-bounded exciton; photoluminescence enhancement; Raman shifts
类别
资金
- Ministry of Science and Technology of China [2015CB932403]
- National Natural Science Foundation of China [91545131, 11674255, 51371084]
- China Postdoctoral Science Foundation [2014T70727]
Photoluminescence (PL) of transition metal dichalcogenides (TMDs) can be engineered by controlling the density of defects, which provide active sites for electron-hole recombination, either radiatively or non-radiatively. However, the implantation of defects by external stimulation, such as uniaxial tension and irradiation, tends to introduce local damages or structural non-homogeneity, which greatly degrades their luminescence properties and impede their applicability in constructing optoelectronic devices. In this paper, we present a strategy to introduce a controllable level of defects into the MoS2 monolayers by adding a hydrogen flow during the chemical vapor deposition, without sacrificing their luminescence characteristics. The density of the defect is controlled directly by the concentration of hydrogen. For an appropriate hydrogen flux, the monolayer MoS2 sheets have three times stronger PL emission at the excitonic transitions, compared with those samples with nearly perfect crystalline structure. The defect-bounded exciton transitions at lower energies arising in the defective samples and are maximized when the total PL is the strongest. However, the B exciton, exhibits a monotonic decline as the defect density increases. The Raman spectra of the defective MoS2 reveal a redshift (blueshift) of the in-plane (out-of-plane) vibration modes as the hydrogen flux increases. All the evidence indicates that the generated defects are in the form of sulfur vacancies. This study renders the high-throughput synthesis of defective MoS2 possible for catalysis or light emitting applications.
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