Methods of forming colloidal nanocrystal-based thin film devices
地域：
PA
PA Philadelphia
摘要
Methods of forming colloidal nanocrystal (NC)-based thin film devicesare disclosed. The methods include the steps of depositing a dispersion of NCs on a substrate to form a NC thin-film, wherein at least a portion of the NCs is capped with chalcogenocyanate (xCN)-based ligands; and doping the NC thin-film with a metal.
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Ligand exchange of Ag NCs. In one embodiment, a dispersion of Ag NCs underwent a ligand exchange according to the following steps: Chemical treatment was performed after spincasting or nanoimprinting. Exchange was achieved by immersing the NC-coated substrate in a methanol solution containing the new ligand. Non-specifically bound ligands were washed off the surface by immersing the sample in two successive baths of pure methanol and drying it in air. Ethanedithiol was prepared as a 1% (v/v) solution in methanol and exchange was carried out for 3 hours. For NH4SCN and NH4Cl the conditions were either 50 mM for 10 min, or 130 mM for 2 min. For potassium hydrogen sulfide the conditions were 50 mM for 10 min.
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