{Reference Type}: Journal Article
{Title}: Revealing the Optical Transition Properties of Interlayer Excitons in Defective WS2/WSe2 Heterobilayers.
{Author}: Wu K;Yang Z;Shi Y;Wang Y;Xiang B;Zhou H;Chen W;Zhang S;Xu H;Xiong Q;
{Journal}: Nano Lett
{Volume}: 24
{Issue}: 28
{Year}: 2024 Jul 17
{Factor}: 12.262
{DOI}: 10.1021/acs.nanolett.4c02025
{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 WS2/WSe2 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.