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High efficiency organic photovoltaic cells employing hybridized mixed-planar heterojunctions

United States Patent

9,112,164
August 18, 2015
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A device is provided, having a first electrode, a second electrode, and a photoactive region disposed between the first electrode and the second electrode. The photoactive region includes a first photoactive organic layer that is a mixture of an organic acceptor material and an organic donor material, wherein the first photoactive organic layer has a thickness not greater than 0.8 characteristic charge transport lengths; a second photoactive organic layer in direct contact with the first organic layer, wherein the second photoactive organic layer is an unmixed layer of the organic acceptor material of the first photoactive organic layer, and the second photoactive organic layer has a thickness not less than about 0.1 optical absorption lengths; and a third photoactive organic layer disposed between the first electrode and the second electrode and in direct contact with the first photoactive organic layer. The third photoactive organic layer is an unmixed layer of the organic donor layer of the first photoactive organic layer and has a thickness not less than about 0.1 optical absorption lengths.
Xue; Jiangeng (Gainesville, FL), Uchida; Soichi (Yokohama, JP), Rand; Barry P. (Princeton, NJ), Forrest; Stephen (Ann Arbor, MI)
The Trustees of Princeton University (Princeton, NJ)
14/ 068,430
20140053898
October 31, 2013
GOVERNMENT RIGHTS This invention was made with government support under Grant No. F49620-03-1-0410 awarded by the U.S. Air Force Office of Scientific Research and Grant No. ACQ-1-30619-05 (Prime DE-AC36-99GO10337) awarded by the National Renewable Energy Laboratory of the U.S. Department of Energy. The government has certain rights in the invention.