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High efficiency organic photovoltaic cells employing hybridized mixed-planar heterojunctions

United States Patent

November 19, 2013
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 organic layer comprising a mixture of an organic acceptor material and an organic donor material, wherein the first organic layer has a thickness not greater than 0.8 characteristic charge transport lengths, and a second organic layer in direct contact with the first organic layer, wherein: the second organic layer comprises an unmixed layer of the organic acceptor material or the organic donor material of the first organic layer, and the second organic layer has a thickness not less than about 0.1 optical absorption lengths. Preferably, the first organic layer has a thickness not greater than 0.3 characteristic charge transport lengths. Preferably, the second organic layer has a thickness of not less than about 0.2 optical absorption lengths. Embodiments of the invention can be capable of power efficiencies of 2% or greater, and preferably 5% or greater.
Xue; Jiangeng (Piscataway, NJ), Uchida; Soichi (Yokohama, JP), Rand; Barry P. (Princeton, NJ), Forrest; Stephen (Princeton, NJ)
The Trustees of Princeton University (Princeton, NJ)
10/ 910,371
August 4, 2004
The invention disclosed herein was made with Government support under Contract No. F49620-92-1-0277 awarded by the U.S. Air Force Office of Scientific Research and under Contract No. 341-4141 awarded by U.S. Department of Energy, National Renewable Energy Laboratory and. The Government has certain rights in this invention.