Excitons dynamic modulation by tailoring size of high-entropy Mo0.64W0.36S2 alloy

Two-dimensional transition metal disulfides with tailored optical response are vital to demonstrate versatile optoelectronic devices and nanophotonic elements. In this work, using transient absorption spectroscopy in conjunction density functional theory calculations, we ultrafast excitons modulation via tailoring the size of a transition-metal dichalcogenide alloy Mo0.64W0.36S2 nanosheet. As nanosheet increases from 9 ± 5 190 121 nm, peak positions A B vary 666 675 nm 626 638 respectively. Furthermore, decay lifetimes slow down 1.16 1.84 ps when changes nm. It is shown that exciton diffusion properties can be modulated by components structure modulation, which beneficial for optimal design optimization devices.