期刊
APPLIED SURFACE SCIENCE
卷 601, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.154209
关键词
MoS2; Quantum dot; Photoluminescence; Raman spectroscopy; Nonradiative energy transfer; Charge transfer
类别
资金
- National Natural Science Foundation of China [62074103, 61950410610]
- Shenzhen Science and Technology Innovation Commission [JCYJ20170412110137562, JCYJ20200109105413475]
- Key Project of Science and Technology of Guangdong [2020B010169003]
- Shenzhen University Scientific Research Start-up Foundation [860-000002110207]
- Ministry of Education and Science of Ukraine [0122U001954]
- National Research Foundation of Ukraine [2020.02/0134]
This study examines the photo-luminescence of 1L-QD/MoS2 hybrid and compares it to bare 1L MoS2. The results show that the PL intensity is significantly enhanced in the 1L-QD/MoS2 hybrid. This enhancement is attributed to nonradiative energy transfer and charge transfer processes.
MoS2 monolayer quantum dots (1L-QDs) are hybridized on 1L MoS2 on SiO2/Si. The exciton and trion photo-luminescence (PL) of the 1L-QD/MoS2 hybrid is studied in comparison to bare 1L MoS2. The 1L-QDs have a round-like shape with an average lateral size of 3 nm, which results in interband absorption and PL within 2.3-3.5 eV. The bare flake shows the A and B exciton PL bands, overlapped with a weak trion band. The 1L-QD/ MoS2 hybrid comprises the emission bands so that the 1L-QD PL intensity is not altered, but the flake PL is tremendously enhanced. This effect of sensitization depends on the PL excitation energy: 6.4 times under UV excitation involving the transitions between the valence band and the excited states in the conduction band of the 1L-QDs and 2.7 times under blue light excitation involving interband absorption between the 1L-QD quantum states. The strongest effect is explained by an efficient nonradiative energy transfer (NRET), similar to Fo & BULL;rster resonance energy transfer, and possible charge transfer from the resonant levels in the donor 1L-QDs to the levels in the acceptor MoS2 flake. On the contrary, exciting e-h pairs between the 1L-QD quantum states, they rapidly recombine there, weakening NRET.
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