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Title: Multichromophoric energy sensitization of C{sub 60} for organic photovoltaics

In organic photovoltaics (OPVs), photocurrent generation is limited by absorption and exciton diffusion in the active layer. In this work, we describe the energy sensitization of C{sub 60} simultaneously by two chromophores at high volume concentrations (50%). This sensitization strategy takes advantage of the intense absorption of the sensitizers and the exceptional electron conduction and exciton diffusion length of C{sub 60} resulting in a 30% increase in photoresponse of the C{sub 60}-based sensitized acceptor layer between λ = 450 nm and 670 nm and power conversion efficiency under simulated AM 1.5 G illumination. In (2,4-bis[4-(N,N-diphenylamino)-2,6-dihydroxyphenyl] squaraine)/C{sub 60} devices, sensitization results in an increase in J{sub SC} from 6.5 ± 0.2 mA/cm{sup 2} to 8.6 ± 0.2 mA/cm{sup 2} without compromising V{sub OC} or FF. These results demonstrate the robust nature of this sensitization scheme and its broad potential for application in OPVs.
Authors:
 [1] ; ;  [2] ;  [1] ;  [3]
  1. Department of Chemical Engineering, University of Southern California, Los Angeles, California 90089 (United States)
  2. Department of Chemistry, University of Southern California, Los Angeles, California 90089 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22303534
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; COLOR; CONCENTRATION RATIO; DIFFUSION; DIFFUSION LENGTH; EFFICIENCY; ELECTRIC CONDUCTIVITY; ELECTRON MOBILITY; ELECTRONS; EQUIPMENT; EXCITONS; FULLERENES; ILLUMINANCE; LAYERS; PHOTOVOLTAIC EFFECT; SENSITIZERS; SIMULATION