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
Enhanced Power Conversion Efficiency via Hybrid Ligand Exchange Treatment of p-Type PbS Quantum Dots.
Zhi Li Teh,Long Hu,Zhilong Zhang,Angus Gentle,Zihan Chen,Yijun Gao,Lin Yuan,Yicong Hu,Tom Wu,Robert Patterson,Shujuan Huang,Shujuan Huang +11 more
TL;DR: Improved QD passivation and a reduction in interdot distance, improving charge transport through the p-type PbS quantum dot film is improved, leading to an improvement in cell efficiency from 7.0% to a champion cell efficiency of 10.4%.
Journal ArticleDOI
The impact of chemical treatment on optical and electrical characteristics of multipod PbSe nanocrystal films
TL;DR: In this paper, the impact of chemical treatment on spin-cast multipod PbSe nanocrystals films was investigated and the results showed that TGA-treated films have the best electrical properties.
Journal ArticleDOI
Synthesis of thiol modified CdSe nanoparticles/P3HT blends for hybrid solar cell structures
TL;DR: In this paper, TGA capped cadmium selenide (CdSe) nanoparticles were synthesized in aqueous medium through wet chemical method using sodium selenite as the selenium source.
Journal ArticleDOI
Role of PbSe Structural Stabilization in Photovoltaic Cells
Demet Asil,Brian J. Walker,Bruno Ehrler,Yana Vaynzof,Alessandro Sepe,Sam L. Bayliss,Aditya Sadhanala,Philip C. Y. Chow,Paul E. Hopkinson,Ullrich Steiner,Neil C. Greenham,Richard H. Friend +11 more
TL;DR: In this article, an improvement in long-range ordering of chalcogenide nanocrystal (NC) symmetry that results from halide surface passivation is described, and the effects on chemical, optical and photovoltaic device properties are investigated.
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.