Document Detail


Structural, optical, and electrical properties of self-assembled films of PbSe nanocrystals treated with 1,2-ethanedithiol.
MedLine Citation:
PMID:  19206627     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We describe the structural, optical, and electrical properties of high-quality films of PbSe nanocrystals fabricated by a layer-by-layer (LbL) dip-coating method that utilizes 1,2-ethanedithiol (EDT) as an insolubilizing agent. Comparative characterization of nanocrystal films made by spin-coating and by the LbL process shows that EDT quantitatively displaces oleic acid on the PbSe surface, causing a large volume loss that electronically couples the nanocrystals while severely degrading their positional and crystallographic order of the films. Field-effect transistors based on EDT-treated films are moderately conductive and ambipolar in the dark, becoming p-type and 30-60 times more conductive under 300 mW cm(-2) broadband illumination. The nanocrystal films oxidize rapidly in air to yield, after short air exposures, highly conductive p-type solids. The LbL process described here is a general strategy for producing uniform, conductive nanocrystal films for applications in optoelectronics and solar energy conversion.
Authors:
Joseph M Luther; Matt Law; Qing Song; Craig L Perkins; Matthew C Beard; Arthur J Nozik
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  ACS nano     Volume:  2     ISSN:  1936-086X     ISO Abbreviation:  -     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2009-02-11     Completed Date:  2009-03-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101313589     Medline TA:  ACS Nano     Country:  United States    
Other Details:
Languages:  eng     Pagination:  271-80     Citation Subset:  IM    
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
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MeSH Terms
Descriptor/Qualifier:
Crystallization / methods*
Electric Conductivity
Electrochemistry / methods*
Lead / chemistry*
Light
Macromolecular Substances / chemistry
Materials Testing
Membranes, Artificial*
Mercaptoethanol / analogs & derivatives*,  chemistry
Molecular Conformation
Nanostructures / chemistry*,  ultrastructure
Nanotechnology / methods*
Particle Size
Photochemistry / methods*
Refractometry
Scattering, Radiation
Selenium Compounds / chemistry*
Surface Properties
Chemical
Reg. No./Substance:
0/Macromolecular Substances; 0/Membranes, Artificial; 0/Selenium Compounds; 12069-00-0/lead selenide; 540-63-6/1,2-ethanedithiol; 60-24-2/Mercaptoethanol; 7439-92-1/Lead

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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