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
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Journal ArticleDOI
Charge generation and energy transfer in hybrid polymer/infrared quantum dot solar cells
Elisabeth Strein,Adam E. Colbert,Selvam Subramaniyan,Hirokazu Nagaoka,Cody W. Schlenker,Eric M. Janke,Samson A. Jenekhe,David S. Ginger +7 more
TL;DR: In this article, the authors study photocurrent generation processes in hybrid polymer/quantum dot photovoltaics by comparing device performance and photoinduced absorption (PIA) spectra across blends of three different conjugated polymers, poly(2,3-bis(2-(hexyldecyl)-quinoxaline-5,8-diyl-alt-N-(2-hexyl-decyl)dithieno[3,2-b:2′,3′-d]pyrrole) (PDTPQx
Journal ArticleDOI
Tolerance of Intrinsic Defects in PbS Quantum Dots
TL;DR: This Letter computationally investigates intrinsic defects in a real-size PbS quantum dot passivated with realistic Cl-ligands and finds that even nonideal, atomically nonstoichiometric quantum dots have a clean band gap without in-gap-states provided that quantum dots satisfy electronic stoichiometry.
Journal ArticleDOI
Exploration of Metal Chloride Uptake for Improved Performance Characteristics of PbSe Quantum Dot Solar Cells
Ashley R. Marshall,Ashley R. Marshall,Matthew Young,Arthur J. Nozik,Arthur J. Nozik,Matthew C. Beard,Joseph M. Luther +6 more
TL;DR: This work explored the uptake of metal chloride salts with +1 to +3 metals by PbSe QD solar cells and studied how temperature and immersion times affect optoelectronic properties and photovoltaic cell performance.
Journal ArticleDOI
PbS Nanoparticles Capped with Tetrathiafulvalenetetracarboxylate: Utilizing Energy Level Alignment for Efficient Carrier Transport
Marcus Scheele,Marcus Scheele,David Hanifi,Danylo Zherebetskyy,Slim Chourou,Stephanus Axnanda,Benjamin J. Rancatore,Benjamin J. Rancatore,Kari Thorkelsson,Ting Xu,Ting Xu,Zhi Liu,Lin-Wang Wang,Yi Liu,A. Paul Alivisatos,A. Paul Alivisatos +15 more
TL;DR: A field-effect transistor is fabricated by covalently functionalizing PbS nanoparticles with tetrathiafulvalenetetracarboxylate to provide a different approach to the design of hybrid organic-inorganic nanomaterials, circumvents the problem of phase segregation, and holds for versatile ways to design ordered, coupled nanoparticle thin films.
Journal ArticleDOI
Air Stable PbSe Colloidal Quantum Dot Heterojunction Solar Cells: Ligand-Dependent Exciton Dissociation, Recombination, Photovoltaic Property, and Stability
Yaohong Zhang,Chao Ding,Guohua Wu,Naoki Nakazawa,Jin Chang,Yuhei Ogomi,Taro Toyoda,Shuzi Hayase,Kenji Katayama,Qing Shen +9 more
TL;DR: In this article, a planar heterojunction solar cell (FTO/TiO2/PbSe/Au) with relatively larger active area (0.25 cm2) using tetrabutylammonium iodide (TBAI, I-) as ligand in solid state ligand exchange process was fabricated.
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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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.