Photoluminescence Enhancement and Structure Repairing of Monolayer MoSe 2 by Hydrohalic Acid Treatment
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ArticleAuthors
Han, Hau-VeiLu, Ang-Yu
Lu, Li-Syuan
Huang, Jing-Kai
Li, Henan
Hsu, Chang-Lung
Lin, Yung-Chang
Chiu, Ming-Hui

Suenaga, Kazu
Chu, Chih-Wei
Kuo, Hao-Chung
Chang, Wen-Hao

Li, Lain-Jong

Shi, Yumeng
KAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Date
2016-01-05Online Publication Date
2016-01-05Print Publication Date
2016-01-26Permanent link to this record
http://hdl.handle.net/10754/596857
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Atomically thin two-dimensional transition-metal dichalcogenides (TMDCs) have attracted much attention recently due to their unique electronic and optical properties for future optoelectronic devices. The chemical vapor deposition (CVD) method is able to generate TMDCs layers with a scalable size and a controllable thickness. However, the TMDC monolayers grown by CVD may incorporate structural defects, and it is fundamentally important to understand the relation between photoluminescence and structural defects. In this report, point defects (Se vacancies) and oxidized Se defects in CVD-grown MoSe2 monolayers are identified by transmission electron microscopy and X-ray photoelectron spectroscopy. These defects can significantly trap free charge carriers and localize excitons, leading to the smearing of free band-to-band exciton emission. Here, we report that the simple hydrohalic acid treatment (such as HBr) is able to efficiently suppress the trap-state emission and promote the neutral exciton and trion emission in defective MoSe2 monolayers through the p-doping process, where the overall photoluminescence intensity at room temperature can be enhanced by a factor of 30. We show that HBr treatment is able to activate distinctive trion and free exciton emissions even from highly defective MoSe2 layers. Our results suggest that the HBr treatment not only reduces the n-doping in MoSe2 but also reduces the structural defects. The results provide further insights of the control and tailoring the exciton emission from CVD-grown monolayer TMDCs.Citation
Photoluminescence Enhancement and Structure Repairing of Monolayer MoSe 2 by Hydrohalic Acid Treatment 2016, 10 (1):1454 ACS NanoPublisher
American Chemical Society (ACS)Journal
ACS NanoPubMed ID
26716765Additional Links
http://pubs.acs.org/doi/abs/10.1021/acsnano.5b06960ae974a485f413a2113503eed53cd6c53
10.1021/acsnano.5b06960
Scopus Count
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