Journal
OPTICAL MATERIALS
Volume 94, Issue -, Pages 213-216Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2019.05.047
Keywords
MoS2; Photoluminescence; Interlayer twist; Raman spectroscopy
Categories
Funding
- National Natural Science Foundation (NSF) of China [61801498, 11404399, 11874423, 51701237]
- Scientific Researches Foundation of National University of Defense Technology [ZK16-03-59, ZK18-01-03, ZK18-03-36, ZK18-03-22]
- Youth talent lifting project [17-JCJQ-QT-004]
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Atomically thin molybdenum disulfide (MoS2) has been treated as a promising optoelectronic material, due to its strong photoluminescence (PL) emission. Here, we demonstrate the tunability of the PL properties of bilayer MoS2 through interlayer twist. The PL emission peak position, full-width-at-half-maximum (FWHM) and intensity are found to be dependent on the twisted angle, which reach their extremum for the twisted angle around 40 degrees. This PL modulation is attributed to the change of the interlayer coupling between the adjacent MoS2 layers. In addition, peak A splitting of PL spectra is found in twisted bilayer MoS2, due to the doping effect from substrate. These results enrich our understanding of the relationship between PL emission and interlayer coupling, which is significant for optical and electrical applications of twisted bilayer MoS2 (tBLM).
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