Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 20, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.3138131
Keywords
current density; doping; electrical resistivity; fullerenes; organic compounds; photovoltaic cells; thin films
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada
- Canada Foundation for Innovation
- U. S. National Science Foundation [DMR-0705920]
- Princeton MRSEC of the NSF [DMR-0819860]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [819860] Funding Source: National Science Foundation
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The power conversion efficiency of organic photovoltaic cells can be greatly enhanced by chemical doping to control the conductivity of the organic thin films. We demonstrate a nearly twofold improvement in the efficiency of planar heterojunction copper phthalocyanine/fullerene cells by n-doping the electron acceptor layer with decamethylcobaltocene in the vicinity of the fullerene/cathode interface. Doping improves the charge extraction efficiency and decreases the series resistance of the organic films, improving the current density and fill factor, respectively.
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