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
Packing State Management to Realize Dense and Semiconducting Lead Sulfide Nanocrystals Film via a Single-Step Deposition
Kunyuan Lu,Kunyuan Lu,Xing Meng,Zeke Liu,Jun Chen,Yongjie Wang,Yannan Zhang,Xuliang Zhang,Erik Sarnello,Guozheng Shi,Radhika P. Patil,Wei Deng,Sijie Zhou,Mengfan Gu,Yaxu Zhong,Soojin Jeong,X. Wendy Gu,Tao Li,Tao Li,Xingchen Ye,Wanli Ma +20 more
TL;DR: In this paper, an advanced solid-state ligand exchange strategy was proposed to achieve crack-free PbS NC film in a single deposition step, through managing NC packing state and appropriate processing solvent selection.
Journal ArticleDOI
Direct Synthesis of Highly Conductive tert-Butylthiol-Capped CuInS2 Nanocrystals.
Aurélie Lefrançois,Aurélie Lefrançois,Stéphanie Pouget,Louis Vaure,Louis Vaure,Miguel López-Haro,Peter Reiss,Peter Reiss +7 more
TL;DR: The presented method gives direct access to short-ligand-capped NCs without post-synthetic ligand exchange and shows an increase by a factor of 400 compared to established dodecanethiol-capping CuInS2 NCs.
Journal ArticleDOI
Highly enhanced photocurrent of novel quantum-dot-co-sensitized PbS–Hg/CdS/Cu:ZnO thin films for photoelectrochemical applications
TL;DR: In this paper, a novel quantum-dot-co-sensitized PbS-Hg/CdS/Cu:ZnO thin film was synthesized by low-cost process.
Journal ArticleDOI
Accelerated solution-phase exchanges minimize defects in colloidal quantum dot solids
Yongbiao Zhao,Mengxia Liu,Oleksandr Voznyy,Bin Sun,Peicheng Li,Hao-Ting Kung,Olivier Ouellette,Min-Jae Choi,Zheng-Hong Lu,F. Pelayo García de Arquer,Edward H. Sargent +10 more
TL;DR: In this article, a ligand exchange that favors a rapid (seconds, instead of minutes or hours) surface modification and phase transfer that minimizes surface exposure during phase-transfer is presented.
Journal ArticleDOI
Long-Range Order in Nanocrystal Assemblies Determines Charge Transport of Films
Michela Sainato,Brian Shevitski,Ayaskanta Sahu,Jason D. Forster,Shaul Aloni,Giuseppe Barillaro,Jeffrey J. Urban +6 more
TL;DR: The evaporation-driven self-assembly method results in PbS NC SL structures that are observed over an area of 1 mm × 100 μm, with long-range translational order of up to 100 nm, imparting a polycrystalline texture to the 3D SL films.
References
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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.