Extremely efficient internal exciton dissociation through edge states in layered 2D perovskites

Understanding and controlling charge and energy flow in state-of-the-art semiconductor quantum wells has enabled high-efficiency optoelectronic devices. Two-dimensional (2D) Ruddlesden-Popper perovskites are solution-processed quantum wells wherein the band gap can be tuned by varying the perovskite-layer thickness, which modulates the effective electron-hole confinement. We report that, counterintuitive to classical quantum-confined systems where photogenerated electrons and holes are strongly bound by Coulomb interactions or excitons, the photophysics of thin films made of Ruddlesden-Popper perovskites with a thickness exceeding two perovskite-crystal units (>1.3 nanometers) is dominated by lower-energy…

• UD
  U.S. Department of Energy

  Awards: award300035, SC0012541, award300034
• CN
  Centre National de la Recherche Scientifique

  Award: award300036
• UD
  Université de Rennes 1

  Award: award300037
• LA
  Los Alamos National Laboratory

  Award: award300033