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Organic photovoltaic cell incorporating electron conducting exciton blocking layers

United States Patent

August 26, 2014
View the Complete Patent at the US Patent & Trademark Office
The present disclosure relates to photosensitive optoelectronic devices including a compound blocking layer located between an acceptor material and a cathode, the compound blocking layer including: at least one electron conducting material, and at least one wide-gap electron conducting exciton blocking layer. For example, 3,4,9,10 perylenetetracarboxylic bisbenzimidazole (PTCBI) and 1,4,5,8-napthalene-tetracarboxylic-dianhydride (NTCDA) function as electron conducting and exciton blocking layers when interposed between the acceptor layer and cathode. Both materials serve as efficient electron conductors, leading to a fill factor as high as 0.70. By using an NTCDA/PTCBI compound blocking layer structure increased power conversion efficiency is achieved, compared to an analogous device using a conventional blocking layers shown to conduct electrons via damage-induced midgap states.
Forrest; Stephen R. (Ann Arbor, MI), Lassiter; Brian E. (Ypsilanti, MI)
The Regents of the University of Michigan (Ann Arbor, MI)
13/ 400,963
February 21, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with U.S. Government support under DE-SC00000957 and DE-SC0001013, both awarded by the U.S. Department of Energy. The government has certain rights in the invention.