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Methods for preparing colloidal nanocrystal-based thin films

Patent ·
OSTI ID:1252203
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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.
Research Organization:
The Trustees of the University of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
SC0002158
Assignee:
The Trustees of the University of Pennsylvania (Philadelphia, PA)
Patent Number(s):
9,336,919
Application Number:
13/969,863
OSTI ID:
1252203
Country of Publication:
United States
Language:
English

References (9)

Thiocyanate-Capped Nanocrystal Colloids: Vibrational Reporter of Surface Chemistry and Solution-Based Route to Enhanced Coupling in Nanocrystal Solids journal October 2011
Colloidal nanocrystal synthesis and the organic–inorganic interface journal September 2005
Chemically Tailored Dielectric-to-Metal Transition for the Design of Metamaterials from Nanoimprinted Colloidal Nanocrystals journal December 2012
Thiocyanate-Capped PbS Nanocubes: Ambipolar Transport Enables Quantum Dot Based Circuits on a Flexible Substrate journal November 2011
Flexible and low-voltage integrated circuits constructed from high-performance nanocrystal transistors journal January 2012
Bandlike Transport in Strongly Coupled and Doped Quantum Dot Solids: A Route to High-Performance Thin-Film Electronics journal April 2012
Air-Stable, Nanostructured Electronic and Plasmonic Materials from Solution-Processable, Silver Nanocrystal Building Blocks journal February 2014
Colloidal Nanocrystals with Molecular Metal Chalcogenide Surface Ligands journal June 2009
Stoichiometric Control of Lead Chalcogenide Nanocrystal Solids to Enhance Their Electronic and Optoelectronic Device Performance journal February 2013

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Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY