Journal
APPLIED PHYSICS LETTERS
Volume 91, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.2772208
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Tandem solar cells based on the combination of a poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C61-butyric acid methyl ester and a copper phthalocyanine:fullerene subcell are reported. By using a highly transparent, high-work function WO3 layer as part of the interconnecting system for the two subcells, the authors demonstrate stacked devices with power conversion efficiencies as high as 4.6%. The efficiency of the stacked devices is close to the sum of the efficiencies of the individual subcells. (C) 2007 American Institute of Physics.
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