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
Reducing charge trapping in PbS colloidal quantum dot solids
Daniel M. Balazs,Mohamad Insan Nugraha,Satria Zulkarnaen Bisri,Mykhailo Sytnyk,Wolfgang Heiss,Maria Loi +5 more
TL;DR: In this paper, the authors reported high performance field effect transistors based on lead-sulfide colloidal quantum dots (PbS CQDs) crosslinked with 3-mercaptopropionic acid (MPA).
Journal ArticleDOI
Interfacial recombination for fast operation of a planar organic/QD infrared photodetector.
Timothy P. Osedach,Ni Zhao,Scott M. Geyer,Liang-Yi Chang,Darcy D. Wanger,Alexi C. Arango,Moungi Bawendi,Vladimir Bulovic +7 more
TL;DR: Of particular interest is the prospect for QD optical response that extends into the short-wavelength infrared (SWIR) part of the spectrum with QDs of low-bandgap semiconductors such as PbS and PbSe.
Journal ArticleDOI
Surface chemistry of as-synthesized and air-oxidized PbS quantum dots
H. Beygi,Seyed Abdolkarim Sajjadi,Abolfazl Babakhani,Jeff F. Young,Frank C. J. M. van Veggel +4 more
TL;DR: In this paper, the size-dependent shape and elemental composition of PbS quantum dots (QDs) affect the arrangement and density of adsorbed ligands by QDs surfaces, and their related susceptibility to oxidation.
Journal ArticleDOI
Light-emitting quantum dot transistors: emission at high charge carrier densities.
Julia Schornbaum,Yuriy Zakharko,Martin Held,Stefan Thiemann,Florentina Gannott,Jana Zaumseil,Jana Zaumseil +6 more
TL;DR: Electrolyte-gated PbS quantum dot LEFETs exhibit near-infrared electroluminescence from a confined region within the channel, which proves true ambipolar transport in ligand-exchanged quantum dot solids and significantly improves the external quantum efficiencies with current density.
Journal ArticleDOI
SnS/PbS nanocrystal heterojunction photovoltaics
Alexandros Stavrinadis,Jason M. Smith,Christopher A Cattley,Andrew G Cook,Patrick S. Grant,Andrew A. R. Watt +5 more
TL;DR: The results suggest that SnS nanocrystal films can be used in multi-junction solar cells, that a SnS/PbS heterojunction on its own shows photovoltaic behaviour, and that aSnS layer in an ITO/SnS/ PbS/Al device is acting to suppress the flow of an electron injection current.
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.