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
Colloidal lead-free Cs2AgBiBr6 double perovskite nanocrystals: Synthesis, uniform thin-film fabrication, and application in solution-processed solar cells
Razi Ahmad,Gautam Virender Nutan,Dinesh Singh,Govind Gupta,Udit Soni,Sameer Sapra,Ritu Srivastava +6 more
TL;DR: In this paper, a facile strategy for the synthesis and purification of Cs2AgBiBr6 double perovskite nanocrystals (NCs) that remained stable even after washing with polar solvent was reported.
Journal ArticleDOI
Self-Organization of Nanorods into Ultra-Long Range Two-Dimensional Monolayer End-to-End Network
TL;DR: This work presents a two-dimensional (2-D), millimeter-scale network of colloidal CdSe nanorods (NRs) in monolayer thickness through end-to-end linking and employs a vertical-deposition approach to maintain a consistent rate of NR supply to the interface during the assembly.
Journal ArticleDOI
PbE (E = S, Se) Colloidal Quantum Dot-Layered 2D Material Hybrid Photodetectors.
TL;DR: Recent advancements in hybrid PbE QD-layered 2D photodetectors are reviewed and place them in the context of key findings from studies of charge transport in layered 2D materials and QD films that provide lessons to be applied to the hybrid system.
Journal ArticleDOI
High performance hybrid near-infrared LEDs using benzenedithiol cross-linked PbS colloidal nanocrystals
TL;DR: In this paper, an all solution-based processing method was proposed to produce efficient hybrid polymer-nanocrystal multilayered heterostructures for electroluminescence in the near-infrared (1050-1600 nm).
Journal ArticleDOI
Dynamic Charge Carrier Trapping in Quantum Dot Field Effect Transistors
TL;DR: The dynamics of charge injection and transport in PbS quantum dot (QD) monolayers in a field effect transistor (FET) is studied to propose that the underlying mechanism is some reversible electrochemical process involving dissociation and diffusion of water and/or oxygen related species.
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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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.