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
Dissertation
Fundamental Studies of Semiconductor Metal Chalcogenide Nanocomposite Bulk Heterojunction Thin Films
TL;DR: Cluster beam deposition of semiconductor metal chalcogenide nanoparticles into organic thin films for their characterization for potential applications in next generation photovoltaic devices is described in this paper.
Dissertation
Energy level engineering in colloidal quantum dot solar cells
TL;DR: In this article, the authors demonstrate that the energy levels of lead sulfide colloidal quantum dots (PbS QDs) can shift by up to 0.9 eV between different chemical ligand treatments.
Journal ArticleDOI
Synergistic enhancement of charge generation and transfer in organic solar cells via a separate PbS quantum dot layer
TL;DR: In this paper, a new OSC device architecture is demonstrated by incorporating PbS colloidal quantum dots (QDs) between the organic photoactive layer and the top electrode, which showed the enhanced charge transfer and suppressed recombination loss through the hybrid organic-inorganic interfacial contacts.
Journal ArticleDOI
Long carrier lifetime in faceted PbS quantum dot superlattice fabricated by sedimentation method
TL;DR: In this paper, a colloidal quantum dot (QD) superlattice was fabricated by depositing faceted PbS QDs on pyramidal-microhole array template and flat substrate in solution.
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.