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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Journal ArticleDOI
Research Update: Comparison of salt- and molecular-based iodine treatments of PbS nanocrystal solids for solar cells
TL;DR: In this article, the chemical, optical, and electronic properties of PbS nanocrystal-based solids treated with molecular iodine and tetrabutylammonium iodide were compared.
Journal ArticleDOI
Engineering the Band Alignment in QD Heterojunction Films via Ligand Exchange
Gianluca Grimaldi,Mark J. van den Brom,Indy du Fossé,Ryan W. Crisp,Nicholas Kirkwood,Solrun Gudjonsdottir,Jaco J. Geuchies,Sachin Kinge,Laurens D. A. Siebbeles,Arjan J. Houtepen +9 more
TL;DR: This work demonstrates the possibility to tune the band offset of QD heterostructures via control of the chemical species passivating the QD surface, allowing full control over the energetics of the heterostructure without requiring changes in theQD composition.
Patent
Semiconductor film, solar cell, light-emitting diode, thin film transistor, and electronic device
TL;DR: In this article, the average shortest distance between the semiconductor quantum dots was less than 0.45 nm, and a solar cell, light-emitting diode, thin-film transistor, and electronic device were provided with a semiconductor film.
Journal ArticleDOI
Effects of Curing Temperature on the Optical and Charge Trap Properties of InP Quantum Dot Thin Films
TL;DR: In this article, high luminescent and monodisperse InP quantum dots (QDs) were prepared by a non-organometallic approach in a noncoordinating solvent.
Journal ArticleDOI
Controlled aggregation of quantum dot dispersions by added amine bilinkers and effects on hybrid polymer film properties
Junfeng Yan,Paul D. McNaughter,Ziji Wang,Nigel Hodson,Mu Chen,Zhengxing Cui,Paul O'Brien,Brian R. Saunders +7 more
TL;DR: In this paper, the aggregation of parent ZnO and PbS dispersions was triggered by addition of 1,2-ethylenediamine, which is more user-friendly than 1, 2-ethanedithiol, which was widely used for NC-based solar cells.
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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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.