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
Spectroscopic insights into high defect tolerance of Zn:CuInSe2 quantum-dot-sensitized solar cells
TL;DR: In this article, surface modifications have surprisingly little effect on photovoltaic performance suggesting that intragap defects do not impede but actually assist the photoconversion process in Zn:CuInSe2 QDs.
Journal ArticleDOI
Nanocrystal grain growth and device architectures for high-efficiency CdTe ink-based photovoltaics.
Ryan W. Crisp,Ryan W. Crisp,Matthew G. Panthani,W. L. Rance,Joel N. Duenow,Philip A. Parilla,Rebecca A. Callahan,Rebecca A. Callahan,M. S. Dabney,Joseph J. Berry,Dmitri V. Talapin,Joseph M. Luther +11 more
TL;DR: The use of cadmium telluride (CdTe) nanocrystal colloids as a solution-processable "ink" for large-grain CdTe absorber layers in solar cells is studied to find that inks of predominantly wurtzite tetrapod-shaped nanocrystals with arms ∼5.6 nm in diameter exhibit better device performance compared to inks composed of smaller tetrapods, irregular faceted nanocry crystals, or spherical zincblende nan
Journal ArticleDOI
Trap-State Suppression and Improved Charge Transport in PbS Quantum Dot Solar Cells with Synergistic Mixed-Ligand Treatments.
Santanu Pradhan,Alexandros Stavrinadis,Shuchi Gupta,Yu Bi,Francesco Di Stasio,Gerasimos Konstantatos,Gerasimos Konstantatos +6 more
TL;DR: A ligand exchange procedure based on a mixture of zinc iodide and 3-mercaptopropyonic acid is reported to reduce the VOC deficit without compromising the high current density and enhances the photovoltaic performance.
Journal ArticleDOI
Copper–indium–selenide quantum dot-sensitized solar cells
Jiwoong Yang,Jae-Yup Kim,Jung Ho Yu,Tae-Young Ahn,Hyunjae Lee,Taeseok Choi,Young-Woon Kim,Jin Joo,Min Jae Ko,Taeghwan Hyeon +9 more
TL;DR: A new synthetic process of near infrared (NIR)-absorbing copper-indium-selenide (CISe) quantum dots (QDs) and their applications to efficient and completely heavy-metal-free QD-sensitized solar cells (QDSCs).
Journal ArticleDOI
Reduction of moisture sensitivity of PbS quantum dot solar cells by incorporation of reduced graphene oxide
Beatriz Martín-García,Yu Bi,Mirko Prato,Davide Spirito,Roman Krahne,Gerasimos Konstantatos,Iwan Moreels +6 more
TL;DR: In this article, a solution-processed PbS quantum dot solar cell, consisting of a PBS-silane functionalized reduced graphene oxide (PbS-rGO) layer on top of the absorber film, was presented.
References
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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.