title: Au-PbS core-shell nanocrystals: plasmonic absorption enhancement and electrical doping via intra-particle charge transfer.
abstract: We present a comparative study of optical and electronic properties for PbS nanocrystals and Au-PbS core-shell nanostructures. In Au-PbS nanostructures, we observed two nontrivial synergistic effects: (i) extinction enhancement due to coupling of surface plasmon resonance in the Au core to the excitonic states in the semiconducting PbS shell, and (ii) strong p-type electronic doping of Au-PbS nanocrystal solids that we explained by the intraparticle charge transfer between the PbS shell and the Au core.
authors.affiliation: Department of Chemistry, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Jong-Soo
authors.initials: JS
authors.lastname: Lee
authors.forename: Elena V
authors.initials: EV
authors.lastname: Shevchenko
authors.forename: Dmitri V
authors.initials: DV
authors.lastname: Talapin