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Title: Methods for preparing colloidal nanocrystal-based thin films

Abstract

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.

Inventors:
; ; ; ; ; ; ; ; ;
Issue Date:
Research Org.:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1252203
Patent Number(s):
9336919
Application Number:
13/969,863
Assignee:
The Trustees of the University of Pennsylvania (Philadelphia, PA)
Patent Classifications (CPCs):
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES
DOE Contract Number:  
SC0002158
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Aug 19
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Kagan, Cherie R., Fafarman, Aaron T., Choi, Ji-Hyuk, Koh, Weon-kyu, Kim, David K., Oh, Soong Ju, Lai, Yuming, Hong, Sung-Hoon, Saudari, Sangameshwar Rao, and Murray, Christopher B. Methods for preparing colloidal nanocrystal-based thin films. United States: N. p., 2016. Web.
Kagan, Cherie R., Fafarman, Aaron T., Choi, Ji-Hyuk, Koh, Weon-kyu, Kim, David K., Oh, Soong Ju, Lai, Yuming, Hong, Sung-Hoon, Saudari, Sangameshwar Rao, & Murray, Christopher B. Methods for preparing colloidal nanocrystal-based thin films. United States.
Kagan, Cherie R., Fafarman, Aaron T., Choi, Ji-Hyuk, Koh, Weon-kyu, Kim, David K., Oh, Soong Ju, Lai, Yuming, Hong, Sung-Hoon, Saudari, Sangameshwar Rao, and Murray, Christopher B. Tue . "Methods for preparing colloidal nanocrystal-based thin films". United States. https://www.osti.gov/servlets/purl/1252203.
@article{osti_1252203,
title = {Methods for preparing colloidal nanocrystal-based thin films},
author = {Kagan, Cherie R. and Fafarman, Aaron T. and Choi, Ji-Hyuk and Koh, Weon-kyu and Kim, David K. and Oh, Soong Ju and Lai, Yuming and Hong, Sung-Hoon and Saudari, Sangameshwar Rao and Murray, Christopher B.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {5}
}

Works referenced in this record:

Colloidal Nanocrystals with Molecular Metal Chalcogenide Surface Ligands
journal, June 2009


Colloidal nanocrystal synthesis and the organic–inorganic interface
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Chemically Tailored Dielectric-to-Metal Transition for the Design of Metamaterials from Nanoimprinted Colloidal Nanocrystals
journal, December 2012


Flexible and low-voltage integrated circuits constructed from high-performance nanocrystal transistors
journal, January 2012


Thiocyanate-Capped PbS Nanocubes: Ambipolar Transport Enables Quantum Dot Based Circuits on a Flexible Substrate
journal, November 2011


Thiocyanate-Capped Nanocrystal Colloids: Vibrational Reporter of Surface Chemistry and Solution-Based Route to Enhanced Coupling in Nanocrystal Solids
journal, October 2011


Bandlike Transport in Strongly Coupled and Doped Quantum Dot Solids: A Route to High-Performance Thin-Film Electronics
journal, April 2012