Exciton Energy Routing via Defect Networks in hBN/2D Perovskite Hybrids

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Abstract
Excitons in two-dimensional Ruddlesden–Popper perovskites (RPPs) exhibit large and tunable binding energies, making them promising candidates for optoelectronic applications. In particular, long-range exciton energy transfer in these materials holds potential for light-harvesting technologies and nanoscale interconnects. Here, using cathodoluminescence spectroscopy, we demonstrate that exciton energy can be transferred over ultralong distances─up to 150 μm─in heterostructures composed of hexagonal boron nitride (hBN) and RPPs. This transfer is enabled by efficient exciton coupling to defect centers in hBN and subsequent defect–defect interactions. This mechanism not only facilitates long-range energy transfer but also leads to enhanced luminescence intensity, narrower emission line widths, extended exciton lifetimes, and reduced electron beam-induced degradation. Owing to the high density of emitters within the hBN layers, the investigated van der Waals heterostructure emerges as a robust and stable hybrid platform. Our findings enable room-temperature excitonic devices with enhanced performance, including quantum transducers, light-harvesting systems, and optoelectronic interconnects.
Funding Information
  • HORIZON EUROPE European Research Council (101017720)
  • HORIZON EUROPE European Research Council (101170341)
  • HORIZON EUROPE European Research Council (802130)
  • Bundesministerium für Forschung, Technologie und Raumfahrt
  • European Commission (101115545)
  • Deutsche Forschungsgemeinschaft (447330010)
  • Deutsche Forschungsgemeinschaft (525347396)
  • Deutsche Forschungsgemeinschaft (535573191)
  • Deutsche Forschungsgemeinschaft (554905035)
  • Deutsche Forschungsgemeinschaft (GRK2642)
  • Alexander von Humboldt-Stiftung
  • Volkswagen Foundation

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