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Title: Distance-dependent energy transfer between CdSe/CdS quantum dots and a two-dimensional semiconductor

Atomically thin semiconductors, such as the transition metal dichalcogenides, show great potential for nanoscale photodetection, energy harvesting, and nanophotonics. Here, we investigate the efficiency of energy transfer between colloidal quantum dots with a cadmium selenide core and cadmium sulfide shell and monolayer molybdenum diselenide (MoSe{sub 2}). We show that MoSe{sub 2} effectively quenches the fluorescence of quantum dots when the two materials are in contact. We then separate the MoSe{sub 2} and quantum dots by inserting variable thickness hexagonal boron nitride (h-BN) spacers and show that the efficiency at which the MoSe{sub 2} quenches fluorescence decreases as the h-BN thickness is increased. For distances d, this trend can be modeled by a 1/d{sup 4} decay, in agreement with theory and recent studies involving graphene.
Authors:
;  [1] ;  [2] ;  [3] ; ;  [4] ;  [1] ;  [5] ;  [6]
  1. Institute of Optics, University of Rochester, Rochester, New York 14627 (United States)
  2. Materials Science, University of Rochester, Rochester, New York 14627 (United States)
  3. Department of Chemistry, University of Rochester, Rochester, New York 14627 (United States)
  4. Department of Physics, Northeastern University, Boston, Massachusetts 02115 (United States)
  5. (United States)
  6. Department of Physics, Rochester Institute of Technology, Rochester, New York 14627 (United States)
Publication Date:
OSTI Identifier:
22489270
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 2; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BORON NITRIDES; CADMIUM; CADMIUM SELENIDES; CADMIUM SULFIDES; ENERGY TRANSFER; FLUORESCENCE; GRAPHENE; MOLYBDENUM; MOLYBDENUM SELENIDES; QUANTUM DOTS; SEMICONDUCTOR MATERIALS; THICKNESS; TWO-DIMENSIONAL SYSTEMS