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
Ultrathin PbS sheets by two-dimensional oriented attachment.
Constanze Schliehe,Beatriz H. Juárez,Marie Pelletier,Sebastian Jander,Denis Greshnykh,Mona Nagel,Andreas Meyer,Stephan Foerster,Andreas Kornowski,Christian Klinke,Horst Weller +10 more
TL;DR: Two-dimensional oriented attachment of lead sulfide nanocrystals into ultrathin single-crystal sheets with dimensions on the micrometer scale is reported, found that this process is initiated by cosolvents, which alter nucleation and growth rates during the primary nanocrystal formation, and is finally driven by dense packing of oleic acid ligands on {100} facets of PbS.
Journal ArticleDOI
Dependence of carrier mobility on nanocrystal size and ligand length in PbSe nanocrystal solids.
Yao Liu,Markelle Gibbs,James Puthussery,Steven J. Gaik,Rachelle Ihly,Hugh W. Hillhouse,Matt Law +6 more
TL;DR: The results establish a baseline for mobility trends in PbSe NC solids, with implications for fabricating high-mobility NC-based optoelectronic devices, and find that carrier mobility is independent of the polydispersity of the NC samples, which can be understood if percolation networks of the larger-diameter, smaller-band-gap NCs carry most of the current in these NCsolids.
Journal ArticleDOI
Multiple exciton generation in semiconductor quantum dots
Arthur J. Nozik,Arthur J. Nozik +1 more
TL;DR: In this paper, the authors present a review of recent work on the origin of the concept of enhanced multiple electron-hole pair (i.e. exciton) production in semiconductor quantum dots (QDs).
Journal ArticleDOI
Colloidal quantum-dot photodetectors exploiting multiexciton generation.
TL;DR: A class of solution-processed photoconductive detectors, sensitive in the ultraviolet, visible, and the infrared, are reported, in which the internal gain is dramatically enhanced for photon energies Ephoton greater than 2.7 times the quantum-confined bandgap Ebandgap.
Journal ArticleDOI
Fast, sensitive and spectrally tuneable colloidal-quantum-dot photodetectors
Jason Paul Clifford,Gerasimos Konstantatos,Keith Johnston,Sjoerd Hoogland,Larissa Levina,Edward H. Sargent +5 more
TL;DR: By building devices that exclude the diffusion component, this work is able to demonstrate a >1,000-fold improvement in the sensitivity-bandwidth product of tuneable colloidal-quantum-dot photodiodes operating in the visible and infrared.
References
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Journal ArticleDOI
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
TL;DR: In this article, the authors used thin-film, field effect transistor structures to probe the transport properties of the ordered microcrystalline domains in the conjugated polymer poly(3-hexylthiophene), P3HT.
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.