Exciton Manifolds in Highly Ambipolar Doped WS₂.

ABSTRACT: The disentanglement of single and many particle properties in 2D semiconductors and their dependencies on high carrier concentration is challenging to experimentally study by pure optical means. We establish an electrolyte gated WS2 monolayer field-effect structure capable of shifting the Fermi level from the valence into the conduction band that is suitable to optically trace exciton binding as well as the single-particle band gap energies in the weakly doped regime. Combined spectroscopic imaging ellipsometry and photoluminescence spectroscopies spanning large n- and p-type doping with charge carrier densities up to 1014 cm-2 enable to study screening phenomena and doping dependent evolution of the rich exciton manifold whose origin is controversially discussed in literature. We show tha

SUBMITTER: Tiede DO 

PROVIDER: S-EPMC9504948 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature