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
Nanocrystal Photovoltaic Paint Sprayed With a Handheld Airbrush
Artjay Javier,Edward E. Foos +1 more
TL;DR: In this paper, a complete photovoltaic cell was fabricated using only a handheld airbrush, dilute solutions of CdSe and CdTe nanorods, commercially available silver paint, and transparent-conducting-electrode-coated glass.
Journal ArticleDOI
Large-Scale Robust Quantum Dot Microdisk Lasers with Controlled High Quality Cavity Modes
Chun Hao Lin,Qingji Zeng,Evan Lafalce,Marcus J. Smith,Marcus J. Smith,Sidney T. Malak,Jaehan Jung,Young Jun Yoon,Zhiqun Lin,Zeev Valy Vardeny,Vladimir V. Tsukruk +10 more
TL;DR: In this article, a facile on-chip fabrication of CdSe/Cd1−xZnxSe1−ySy quantum dot microdisk lasers and their large-area arrays via a pattern-assisted layer-by-layer assembly process is presented.
Journal ArticleDOI
PbTe colloidal nanocrystals: Synthesis, mechanism and infrared optical characteristics
TL;DR: In this paper, a solution-phase synthesis route for the preparation of rock salt structure monodispered PbTe nanocrystals (NCs) in a non-coordinating solvent is reported.
Journal ArticleDOI
Assemblies of Colloidal CdSe Tetrapod Nanocrystals with Lengthy Arms for Flexible Thin-Film Transistors
Hyeonjun Heo,Moo Hyung Lee,Jeehye Yang,Han Sol Wee,Jaehoon Lim,Donghyo Hahm,Ji Woong Yu,Wan Ki Bae,Won Bo Lee,Moon Sung Kang,Kookheon Char +10 more
TL;DR: Interestingly, both the conductivity of the assemblies and their mechanical tolerance against bending are improved with an increase in the length of tetrapod arms, and new insights and guidelines for the use of colloidal nanocrystals in solution-processed flexible electronic device applications are provided.
Journal ArticleDOI
Influence of the active layer nanomorphology on device performance for ternary PbS(x)Se(1-x) quantum dots based solution-processed infrared photodetector.
Taojian Song,Haijuan Cheng,Chunjie Fu,Bo He,Weile Li,Junfeng Xu,Yi Tang,Shengyi Yang,Shengyi Yang,Bingsuo Zou +9 more
TL;DR: Experimental data show that the active layer nanomorphology has a great influence on the device performance and provides an easy way to fabricate high performance solution-processed infrared photodetector.
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.