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Method of fabricating an optoelectronic device having a bulk heterojunction

United States Patent

7,419,846
September 2, 2008
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A method of fabricating an organic optoelectronic device having a bulk heterojunction comprises the steps of: depositing a first layer over a first electrode by organic vapor phase deposition, wherein the first layer comprises a first organic small molecule material; depositing a second layer on the first layer such that the second layer is in physical contact with the first layer, wherein the interface of the second layer on the first layer forms a bulk heterojunction; and depositing a second electrode over the second layer to form the optoelectronic device. In another embodiment, a first layer having protrusions is deposited over the first electrode, wherein the first layer comprises a first organic small molecule material. For example, when the first layer is an electron donor layer, the first electrode is an anode, the second layer is an electron acceptor layer, and the second electrode is a cathode. As a further example, when the first layer is an electron acceptor layer, the first electrode is a cathode, the second layer is an electron donor layer, and the second electrode is an anode.
Shtein; Max (Princeton, NJ), Yang; Fan (Princeton, NJ), Forrest; Stephen R. (Princeton, NJ)
The Trustees of Princeton University (Princeton, NJ)
10/ 824,288
April 13, 2004
UNITED STATES GOVERNMENT RIGHTS This invention was made with U.S. Government support under Contract No. ACQ-1-30619-05 (Prime DE-AC36-98GO10337) awarded by the U.S. Department of Energy, National Renewable Energy Laboratory. The government has certain rights in this invention.