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Secondary treatment of films of colloidal quantum dots for optoelectronics and devices produced thereby

United States Patent

April 1, 2014
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A method of forming an optoelectronic device. The method includes providing a deposition surface and contacting the deposition surface with a ligand exchange chemical and contacting the deposition surface with a quantum dot (QD) colloid. This initial process is repeated over one or more cycles to form an initial QD film on the deposition surface. The method further includes subsequently contacting the QD film with a secondary treatment chemical and optionally contacting the surface with additional QDs to form an enhanced QD layer exhibiting multiple exciton generation (MEG) upon absorption of high energy photons by the QD active layer. Devices having an enhanced QD active layer as described above are also disclosed.
Semonin; Octavi Escala (Eugene, OR), Luther; Joseph M. (Boulder, CO), Beard; Matthew C. (Arvada, CO), Chen; Hsiang-Yu (Chungli, CN)
Alliance for Sustainable Energy, LLC (Golden, CO)
13/ 187,276
July 20, 2011
CONTRACTUAL ORIGIN The United States Government has rights in this invention under Contract No. DE-AC36-080028308 between the United States Department of Energy and the Alliance for Sustainable Energy, LLC, the manager and operator of the National Renewable Energy Laboratory.