Probing the interlayer coupling of twisted bilayer MoS2 using photoluminescence spectroscopy.
basic_science · Level V
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- Record sourced from PubMed, PMID 25171263.
- Also identified by DOI 10.1021/nl5014597.
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Abstract
Two-dimensional molybdenum disulfide (MoS2) is a promising material for optoelectronic devices due to its strong photoluminescence emission. In this work, the photoluminescence of twisted bilayer MoS2 is investigated, revealing a tunability of the interlayer coupling of bilayer MoS2. It is found that the photoluminescence intensity ratio of the trion and exciton reaches its maximum value for the twisted angle 0° or 60°, while for the twisted angle 30° or 90° the situation is the opposite. This is mainly attributed to the change of the trion binding energy. The first-principles density functional theory analysis further confirms the change of the interlayer coupling with the twisted angle, which interprets our experimental results.
Medical subject headings
- Disulfides
- Molybdenum
- Nanostructures