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
Solution‐Processed Heterojunction Solar Cells Based on p‐type PbS Quantum Dots and n‐type Bi2S3 Nanocrystals
TL;DR: The first solution processed-inorganic p-n junction based on p-type PbS QDs and n-type Bi2S3 nanocrystals with both phases contributing to photocarrier generation is demonstrated.
Journal ArticleDOI
Schottky Quantum Dot Solar Cells Stable in Air under Solar Illumination
Jiang Tang,Xihua Wang,Lukasz Brzozowski,D. Aaron R. Barkhouse,Ratan Debnath,Larissa Levina,Edward H. Sargent +6 more
TL;DR: This otherwise promising class of photovoltaics suffers amajor limitation: every report details a lack of stability in air, and two general areas of possible degradation may be posited.
Journal ArticleDOI
Determining the Internal Quantum Efficiency of PbSe Nanocrystal Solar Cells with the Aid of an Optical Model
TL;DR: On the basis of the magnitudes and shapes of the IQE spectra, it is concluded that the 1,2-ethanedithiol treated NC devices studied here do not produce appreciable MEG photocurrent.
Journal ArticleDOI
Bilayer PbS Quantum Dots for High-Performance Photodetectors
Zhenwei Ren,Zhenwei Ren,Zhenwei Ren,Jian-Kun Sun,Hui Li,Peng Mao,Yuanzhi Wei,Xinhua Zhong,Xinhua Zhong,Jin-Song Hu,Shiyong Yang,Jizheng Wang +11 more
TL;DR: A bilayer QD-only device is designed, which can be integrated on flexible polyimide substrate and significantly outperforms the conventional single-layer devices in response speed, detectivity, linear dynamic range, and signal-to-noise ratio, along with comparable responsivity.
Journal ArticleDOI
Unity quantum yield of photogenerated charges and band-like transport in quantum-dot solids
Elise Claude Valentine Talgorn,Yunan Gao,Michiel Aerts,Lucas T. Kunneman,Juleon M. Schins,Tom J. Savenije,Marijn A. van Huis,Marijn A. van Huis,Herre S. J. van der Zant,Arjan J. Houtepen,Laurens D. A. Siebbeles +10 more
TL;DR: These strongly coupled quantum-dot films have electrical properties that approach those of crystalline bulk semiconductors, while retaining the size tunability and cheap processing properties of colloidal quantum dots.
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.