Journal
SMALL
Volume 12, Issue 29, Pages 3976-3984Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201601021
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Funding
- Recruitment Program of Global Youth Experts (the Thousand Youth Talents Program) in China
- US Department of Energy [DE-FG02-11ER46796]
- Office of Science, Office of Basic Energy Sciences, of the US Department of Energy [DE-AC02-05CH11231]
- US National Science Foundation [DMR-1306601]
- China Scholarship Council (CSC) [201406210211]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1306601] Funding Source: National Science Foundation
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The atomic thickness and flatness allow properties of 2D semiconductors to be modulated with influence from the substrate. Reversible modulation of these properties requires an active, reconfigurable substrate, i.e., a substrate with switchable functionalities that interacts strongly with the 2D overlayer. In this work, the photoluminescence (PL) of monolayer molybdenum disulfide (MoS2) is modulated by interfacing it with a phase transition material, vanadium dioxide (VO2). The MoS2 PL intensity is enhanced by a factor of up to three when the underlying VO2 undergoes the thermally driven phase transition from the insulating to metallic phase. A nonvolatile, reversible way to rewrite the PL pattern is also demonstrated. The enhancement effect is attributed to constructive optical interference when the VO2 turns metallic. This modulation method requires no chemical or mechanical processes, potentially finding applications in new switches and sensors.
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