%0 Journal Article
%T Revealing the Optical Transition Properties of Interlayer Excitons in Defective WS2/WSe2 Heterobilayers.
%A Wu K
%A Yang Z
%A Shi Y
%A Wang Y
%A Xiang B
%A Zhou H
%A Chen W
%A Zhang S
%A Xu H
%A Xiong Q
%J Nano Lett
%V 24
%N 28
%D 2024 Jul 17
%M 38975929
%F 12.262
%R 10.1021/acs.nanolett.4c02025
%X 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.