Journal ArticleDOI
Structural, Optical and Electrical Properties of Self-Assembled Films of PbSe Nanocrystals Treated with 1,2-Ethanedithiol
TLDR
The LbL process described here is a general strategy for producing uniform, conductive nanocrystal films for applications in optoelectronics and solar energy conversion.Abstract:
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 co...read more
Citations
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Recent Progress in Colloidal Quantum Dot Solar Cells: Novel Strategies in Synthesis and Device Structure
Min-Jae Choi,Yeon Sik Jung +1 more
TL;DR: The power conversion efficiency of CQD solar cells has rapidly increased up to 8.6%, which corresponds to the 3-4 fold improvement during the last 3 - 4 years as mentioned in this paper.
Book ChapterDOI
Methods for ligand exchange
TL;DR: In this paper , the typical methods and mechanisms for the ligand exchange of nanoparticles that have been developed so far are summarized and a summary and some perspectives on the future development of the ligands exchange technology are provided.
Proceedings ArticleDOI
Critical interfaces in new solar cell materials: organic heterojunctions and heterojunctions involving semiconductor nanoparticles
Neal R. Armstrong,Dana M. Alloway,Amy L. Graham,R. Clayton Shallcross,Michael T. Brumbach,P. Alex Veneman,Diogenes Placencia,Weining Wang +7 more
TL;DR: In this article, a combination of UV-photoelectron and X-ray photoelectron spectroscopy (UPS/XPS) was used for the characterization of representative======cffffheterojunctions, and extrapolate these studies to the optimization of new photovoltaic and photoelectrochemical energy conversion devices.
Journal ArticleDOI
Electrochemical Lithium Doping of Cu2-xS Nanocrystal Assemblies for Tuning Their Near Infrared Absorbance
TL;DR: The charge carrier density of copper sulfide nanocrystals (Cu2-xS NCs) is sensitive to variations in the atomic composition, which determines the nature of sulfur bonding as mentioned in this paper .
References
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Two-dimensional charge transport in self-organized, high-mobility conjugated polymers
Henning Sirringhaus,Peter J. Brown,Richard H. Friend,Martin Nielsen,Klaus Bechgaard,B.M.W. Langeveld-Voss,A. J. H. Spiering,René A. J. Janssen,E. W. Meijer,P. T. Herwig,Dago M. de Leeuw +10 more
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Journal ArticleDOI
Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer
TL;DR: In this article, a hybrid organic/inorganic electroluminescent device was constructed based on the recombination of holes injected into a layer of semiconducting p-paraphenylene vinylene (PPV) with electrons injected into the multilayer film of cadmium selenide nanocrystals.
Journal Article
Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer
TL;DR: In this article, a hybrid organic/inorganic electroluminescent device was constructed based on the recombination of holes injected into a layer of semiconducting p-paraphenylene vinylene (PPV) with electrons injected into the multilayer film of cadmium selenide nanocrystals.
Journal ArticleDOI
Electroluminescence from single monolayers of nanocrystals in molecular organic devices
TL;DR: A hybrid light-emitting diode (LED) that combines the ease of processability of organic materials with the narrow-band, efficient luminescence of colloidal quantum dots (QDs) is demonstrated and a 25-fold improvement in luminescent efficiency is observed.
Journal ArticleDOI
Quantum dot solar cells
TL;DR: In this article, three QD solar cell configurations are described: (1) photoelectrodes comprising QD arrays, (2) QD-sensitized nanocrystalline TiO 2, and (3) QDs dispersed in a blend of electron- and hole-conducting polymers.