Revealing the Optical Transition Properties of Interlayer Excitons in Defective WS<sub>2</sub>/WSe<sub>2</sub> Heterobilayers.
basic_science · Level V
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- Record sourced from PubMed, PMID 38975929.
- Also identified by DOI 10.1021/acs.nanolett.4c02025.
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Abstract
Manipulation of physical properties in multidimensional tunable moiré superlattice systems is a key focus in nanophotonics, especially for interlayer excitons (IXs) in two-dimensional materials. However, the impact of defects on IXs remains unclear. Here, we thoroughly study the optical properties of WS<sub>2</sub>/WSe<sub>2</sub> heterobilayers with varying defect densities. Low-temperature photoluminescence (PL) characterizations reveal that the low-energy IXs are more susceptible to defects compared to the high-energy IXs. The low-energy IXs also show much faster PL quenching rate with temperature, faster peak width broadening rate with laser power, shorter lifetime, and lower circular polarization compared to the low-energy IXs in the region with fewer defects. These effects are attributed to the combined effects of increased electron scattering, exciton-phonon interactions, and nonradiative channels introduced by the defects. Our findings aid in optimizing moiré superlattice structures.