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
More filters
Journal ArticleDOI
Simplicity as a Route to Impact in Materials Research.
Xinchun Tian,Kara R. Lind,Bin Yuan,Santosh Shaw,Oskar Siemianowski,Ludovico Cademartiri,Ludovico Cademartiri +6 more
TL;DR: This Progress Report proposes how impact can be pursued systematically in materials research through a simplicity-driven approach to discovery-driven or problem-driven research.
Journal ArticleDOI
Vertically Stacked Intraband Quantum Dot Devices for Mid-Wavelength Infrared Photodetection.
TL;DR: In this paper, the first vertical intraband quantum dot heterojunction devices composed of Ag2Se/PbS/Ag2Se quantum dot stacks are reported, which bring the advantage of reduced dark conductivity with a simplified device fabrication procedure.
Journal ArticleDOI
Redox Levels of Dithiols in II–VI Quantum Dots vis-à-vis Photoluminescence Quenching: Insight from Scanning Tunneling Spectroscopy
TL;DR: In this article, the conduction and valence-band edges of CdSe nanocrystals were located and the redox levels of dithiols were determined via scanning tunneling spectroscopy (STS) studies to provide evidence of hole trapping and thereby photoluminescence quenching.
Journal ArticleDOI
Highly conductive CuInSe2 nanocrystals with inorganic surface ligands
Antoine de Kergommeaux,Angela Fiore,Jérôme Faure-Vincent,Frédéric Chandezon,Adam Pron,Rémi de Bettignies,Peter Reiss +6 more
TL;DR: In this article, all-inorganic 12-nm CuInSe 2 nanocrystals, surface functionalized with metal chalcogenide complex ligands, were prepared via phase transfer ligand exchange in a biphasic (anhydrous hydrazine/hexane) mixture.
Journal ArticleDOI
Aberration Corrected STEM Study of the Surface of Lead Chalcogenide Nanoparticles
Domingo I. Garcia-Gutierrez,Diana F. Garcia-Gutierrez,Lina M. De Leon-Covian,Mario T. Treviño-Gonzalez,M. A. Garza-Navarro,Iván E. Moreno-Cortez,R.F. Cienfuegos-Pelaes +6 more
TL;DR: In this paper, the microscopic and spectroscopic characterization of lead chalcogenide nanoparticles was reported. But the results obtained showed that the synthesized nanoparticles always display a higher concentration of Pb compared to that of the chalkogen, and they were also characterized by means of Fourier transform infrared (FTIR) absorption spectroscopy to assess the functional groups found on the surface of the nanoparticles.
References
More filters
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.