Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3464169
Keywords
organic semiconductors; photoconductivity; semiconductor heterojunctions; solar cells
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Funding
- IWT [060843]
- Institute for the Promotion of Innovation by Science and Technology in Flanders (IWT)
- European Community [FP7/2007-2013, 212311]
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Tandem organic solar cells with peak conversion efficiencies (eta) of 5.15% are demonstrated. This is achieved by stacking two different planar heterojunction devices, each with a high open-circuit voltage (V(oc)). 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 V(oc) values of nearly 2 V, while fill factor remains above 60%. The measured eta corresponds to a 40% increase compared to eta of the optimal single cells. (C) 2010 American Institute of Physics. [doi:10.1063/1.3464169]
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