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
Photovoltaic Devices Based on Colloidal PbX Quantum Dots: Progress and Prospects
TL;DR: A certified power conversion efficiency (PCE) of 12.0% and an outstanding air stability has been achieved for PbX quantum dots (QDs) solar cells, indicating strong potential for next generation low-cost solution-processed photovoltaics as mentioned in this paper.
Journal ArticleDOI
Continuous hydrothermal synthesis of nickel oxide nanoplates and their use as nanoinks for p-type channel material in a bottom-gate field-effect transistor
TL;DR: The result suggests that various electronic devices can be prepared using metal oxide nanomaterials, which exhibit various properties including magnetism, ferroelectronics and catalysis as well as stability and safety in air and water.
Journal ArticleDOI
Designing Metallic and Insulating Nanocrystal Heterostructures to Fabricate Highly Sensitive and Solution Processed Strain Gauges for Wearable Sensors.
Woo Seok Lee,Seung-Wook Lee,Hyungmok Joh,Mingi Seong,Haneun Kim,Min Su Kang,Ki Hyun Cho,Yun Mo Sung,Soong Ju Oh +8 more
TL;DR: All-solution processed, high-performance wearable strain sensors are demonstrated using heterostructure nanocrystal (NC) solids and the combined site and bond percolation theory is developed to illuminate the origin of their enhanced sensitivity.
Journal ArticleDOI
Low-temperature annealed PbS quantum dot films for scalable and flexible ambipolar thin-film-transistors and circuits
Chan Ho Jo,Jaehyun Kim,Jaekyun Kim,Jiwan Kim,Min Suk Oh,Moon Sung Kang,Myung-Gil Kim,Yong-Hoon Kim,Byeong Kwon Ju,Sung Kyu Park +9 more
TL;DR: In this article, a scalable photolithography process was used to construct bottom-gate and bottom-contact ambipolar PbS quantum dot thin-film-transistors (QD TFTs) with an electron/hole mobility of 0.47/0.43 cm2 V−1 s−1 and CMOS inverter circuits with gains of > 14 V at a supply bias of 10 V.
Journal ArticleDOI
A novel anion-exchange strategy for constructing high performance PbS quantum dot-sensitized solar cells
TL;DR: In this article, an anion exchange reaction occurs between PbSO3 and S2− in aqueous solution at low temperature under ambient conditions, which yields an impressive power conversion efficiency of 306% without resorting to any doping or co-sensitization.
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.