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Enhanced exciton diffusion in an organic photovoltaic cell by energy transfer using a phosphorescent sensitizer

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2 Author(s)
Luhman, Wade A. ; Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA ; Holmes, Russell J.

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We demonstrate enhanced exciton diffusion in an organic photovoltaic cell through the incorporation of a phosphorescent sensitizer. The increase in exciton diffusion length (LD) is realized using a composite electron donor layer consisting of a N,N-bis(naphthalen-1-yl)-N,N-bis(phenyl)-benzidine (NPD) host doped with the phosphorescent guest fac-tris(2-phenylpyridine) iridium [Ir(ppy)3]. The presence of the phosphor at low concentration allows for the population of the long-lived NPD triplet state and an increase in LD. An increase in the NPD LD from 6.5±0.3 to 11.8±0.6 nm is extracted from measurements of the external quantum efficiency for donor layers containing 5 wt % Ir(ppy)3. This enhancement leads to a ∼80% improvement in the power conversion efficiency relative to devices containing an undoped donor layer.

Published in:

Applied Physics Letters  (Volume:94 ,  Issue: 15 )

Date of Publication:

Apr 2009

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