Electroluminescence from multi-particle exciton complexes in transition metal dichalcogenide semiconductors.

ABSTRACT: Light emission from higher-order correlated excitonic states has been recently reported in hBN-encapsulated monolayer WSe₂ and WS₂ upon optical excitation. These exciton complexes are found to be bound states of excitons residing in opposite valleys in momentum space, a promising feature that could be employed in valleytronics or other novel optoelectronic devices. However, electrically-driven light emission from such exciton species is still lacking. Here we report electroluminescence from bright and dark excitons, negatively charged trions and neutral and negatively charged biexcitons, generated by a pulsed gate voltage, in hexagonal boron nitride encapsulated monolayer WSe₂ and WS₂ with graphene as electrode. By tailoring the pulse parameters

SUBMITTER: Paur M 

PROVIDER: S-EPMC6461636 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature