Ultrafast formation of interlayer hot excitons in atomically thin MoS2/WS2 heterostructures.

ABSTRACT: Van der Waals heterostructures composed of two-dimensional transition-metal dichalcogenides layers have recently emerged as a new family of materials, with great potential for atomically thin opto-electronic and photovoltaic applications. It is puzzling, however, that the photocurrent is yielded so efficiently in these structures, despite the apparent momentum mismatch between the intralayer/interlayer excitons during the charge transfer, as well as the tightly bound nature of the excitons in 2D geometry. Using the energy-state-resolved ultrafast visible/infrared microspectroscopy, we herein obtain unambiguous experimental evidence of the charge transfer intermediate state with excess energy, during the transition from an intralayer exciton to an interlayer exciton at the interface of a WS

SUBMITTER: Chen H 

PROVIDER: S-EPMC4992179 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature