Organic tandem solar cells with complementary absorbing layers and a high open-circuit voltage

Tandem organic solar cells with peak conversion efficiencies (η) of 5.15% are demonstrated. This is achieved by stacking two different planar heterojunction devices, each with a high open-circuit voltage (Voc). The phthalocyanine based donor materials in the employed subcells possess complementary a...

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Bibliographic Details
Published in:Applied physics letters 2010-07, Vol.97 (3)
Main Authors: Cheyns, D., Rand, B. P., Heremans, P.
Format: Article
Language:English
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Summary:Tandem organic solar cells with peak conversion efficiencies (η) of 5.15% are demonstrated. This is achieved by stacking two different planar heterojunction devices, each with a high open-circuit voltage (Voc). The phthalocyanine based donor materials in the employed subcells possess complementary absorption, a quality of critical importance to optimize photocurrent in a series connected tandem cell. The tandem structure produces Voc values of nearly 2 V, while fill factor remains above 60%. The measured η corresponds to a 40% increase compared to η of the optimal single cells.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3464169