Perspective on plexciton based on transition metal dichalcogenides

Abstract

Two-dimensional transition metal dichalcogenides (TMDCs) have outstanding physical advantages over graphene-like non-zero bandgap structures. It indicates that the monolayer TMDC material has significant light–material interaction, and it also implies that TMDCs have various application prospects in optoelectronic devices. The coupling of excitons and metal surface plasmons in monolayer TMDCs would affect the optical and electrical properties of the TMDC surface, and we revealed the improvement of surface catalytic reaction efficiency by plexcitons (coupling of excitons and plasmons) supported by recent experiments and theoretical reports. We also review the stress regulation on charge transfer excitons based on van der Waals (vdW) heterostructures composed of TMDCs, the special characteristics, and potential applications of coupling charge-transfer excitons with Ag plasmons in vdW and lateral heterostructures.