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
Improved photoluminescence quantum yield and stability of CdSe-TOP, CdSe-ODA-TOPO, CdSe/CdS and CdSe/EP nanocomposites
Shutian Wei,Zhilin Zhu,Wang Zhixiao,Gugangfen Wei,Pingjian Wang,Hai Li,Zhen Hua,Zhonghai Lin +7 more
TL;DR: In this article, size-controllable monodisperse CdSe nanocrystals with different organic capping were prepared based on the hot-injection method, and the effective separation of nucleation and growth was achieved by rapidly mixing two highly reactive precursors.
Journal ArticleDOI
Preparation and photoluminescence of SiO2-CdTe multilayer film by layer-by-layer self-assembly
Ping Yang,Norio Murase +1 more
TL;DR: In this article, a surface-treated plate was successively dipped into three different solutions: surfactant (thioglycolic acid, TGA), colloidal QDs, and functional silicon alkoxide, which resulted in a narrowing of the photoluminescence spectrum and a red shift of the peak wavelength due to reabsorption of the emission.
Journal ArticleDOI
Single-Step-Fabricated Perovskite Quantum Dot Photovoltaic Absorbers Enabled by Surface Ligand Manipulation
TL;DR: In this article , a single-step fabrication approach of conductive thick PQD absorbers was devised for conductive CsPbI3-PQD solar cells.
Patent
Methods and apparatus for 3D UV imaging
TL;DR: In this article, a 3D ultraviolet imaging LADAR system includes a UV source configured to generate a UV interrogation beam, a sensor configured to receive a UV return beam reflected from a target and to produce an electrical signal, and an imaging module coupled to the sensor and configurable to receive the electrical signal and generate a corresponding 3D image of the target.
Journal ArticleDOI
Manipulating Electronic Structure from the Bottom-Up: Colloidal Nanocrystal-Based Semiconductors.
TL;DR: The factors that determine the electronic structure in colloidal NC-based semiconductors are described and comment on approaches for measuring or calculating this electronic structure are commented on.
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.