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Methods for preparing colloidal nanocrystal-based thin films

United States Patent

May 10, 2016
View the Complete Patent at the US Patent & Trademark Office
Methods of exchanging ligands to form colloidal nanocrystals (NCs) with chalcogenocyanate (xCN)-based ligands and apparatuses using the same are disclosed. The ligands may be exchanged by assembling NCs into a thin film and immersing the thin film in a solution containing xCN-based ligands. The ligands may also be exchanged by mixing a xCN-based solution with a dispersion of NCs, flocculating the mixture, centrifuging the mixture, discarding the supernatant, adding a solvent to the pellet, and dispersing the solvent and pellet to form dispersed NCs with exchanged xCN-ligands. The NCs with xCN-based ligands may be used to form thin film devices and/or other electronic, optoelectronic, and photonic devices. Devices comprising nanocrystal-based thin films and methods for forming such devices are also disclosed. These devices may be constructed by depositing NCs on to a substrate to form an NC thin film and then doping the thin film by evaporation and thermal diffusion.
Kagan; Cherie R. (Bala-Cynwyd, PA), Fafarman; Aaron T. (Philadelphia, PA), Choi; Ji-Hyuk (Philadelphia, PA), Koh; Weon-kyu (Los Alamos, NM), Kim; David K. (Lincoln, MA), Oh; Soong Ju (Philadelphia, PA), Lai; Yuming (Philadelphia, PA), Hong; Sung-Hoon (Daejeon, KR), Saudari; Sangameshwar Rao (Fishkill, NY), Murray; Christopher B. (Bala Cynwyd, PA)
The Trustees of the University of Pennsylvania (Philadelphia, PA)
13/ 969,863
August 19, 2013
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH Aspects of this invention were made with government support under one or more of: contract number DMS-0935165 awarded by the National Science Foundation (NSF) Solar Program; under contract number DE-SC0002158 awarded by the U.S. Department of Energy Office of Basic Energy Sciences, Division of Materials Science and Engineering; under contract number ONR-N00014-10-1-0942 awarded by the Office of Naval Researched MURI Program; under contract number CBET-0854226 awarded by NSF-CBET; and under contract number DMR11-20901 awarded by the NSF. The government has rights in this invention.