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Title: Slow light enhanced singlet exciton fission solar cells with a 126% yield of electrons per photon

Singlet exciton fission generates two triplet excitons per absorbed photon. It promises to increase the power extracted from sunlight without increasing the number of photovoltaic junctions in a solar cell. We demonstrate solar cells with an external quantum efficiency of 126% by enhancing absorption in thin films of the singlet exciton fission material pentacene. The device structure exploits the long photon dwell time at the band edge of a distributed Bragg reflector to achieve enhancement over a broad range of angles. Measuring the reflected light from the solar cell establishes a lower bound of 137% for the internal quantum efficiency.
Authors:
; ;  [1] ; ;  [2]
  1. Energy Frontier Research Center for Excitonics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
  2. Department of Physics, Queens College and Graduate Center, The City University of New York, Flushing, New York 11367 (United States)
Publication Date:
OSTI Identifier:
22253213
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 26; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; ABSORPTION; ELECTRONS; EXCITONS; PENTACENE; PHOTONS; PHOTOVOLTAIC EFFECT; QUANTUM EFFICIENCY; SOLAR CELLS; THIN FILMS; TRIPLETS