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Controlled growth of larger heterojunction interface area for organic photosensitive devices

United States Patent

December 29, 2009
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
An optoelectronic device and a method of fabricating a photosensitive optoelectronic device includes depositing a first organic semiconductor material on a first electrode to form a continuous first layer having protrusions, a side of the first layer opposite the first electrode having a surface area at least three times greater than an underlying lateral cross-sectional area; depositing a second organic semiconductor material directly on the first layer to form a discontinuous second layer, portions of the first layer remaining exposed; depositing a third organic semiconductor material directly on the second layer to form a discontinuous third layer, portions of at least the second layer remaining exposed; depositing a fourth organic semiconductor material on the third layer to form a continuous fourth layer, filling any exposed gaps and recesses in the first, second, and third layers; and depositing a second electrode on the fourth layer, wherein at least one of the first electrode and the second electrode is transparent, and the first and third organic semiconductor materials are both of a donor-type or an acceptor-type relative to second and fourth organic semiconductor materials, which are of the other material type.
Yang; Fan (Somerset, NJ), Forrest; Stephen R. (Ann Arbor, MI)
The Trustees of Princeton University (Princeton, NJ), The Regents of the University of Michigan (Ann Arbor, MI)
11/ 483,641
July 11, 2006
UNITED STATES GOVERNMENT RIGHTS This invention was made with government support under contact DE-AC36-98-GO10337 and sub-contract XAT-5-33636-03 awarded by U.S. Department of Energy, National Renewable Energy Laboratory. The government has certain rights in the invention.