Cluster synthesis of branched CdTe nanocrystals for use in light-emitting diodes

Chin, Ptk Patrick; Stouwdam, JW Jan; Bavel, SS Svetlana van; Janssen, Raj René

doi:10.1088/0957-4484/19/20/205602

Cited by 24 publications

(8 citation statements)

References 31 publications

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“…[12] As an important wide band gap II-VI semiconductor, CdTe continues to draw increasing attention in both fundamental studies and for its various promising ap- [ plications in the field of photonic crystals, light-emitting diodes (LEDs), solar cells, and bioimaging. [13][14][15][16][17][18] The CdTe nanostructured materials exhibit outstanding optical and electrical properties, [19][20][21][22][23][24][25][26][27] and reducing the dimensionality and size of CdTe to a nanoscale range may be a successful strategy to gain further enhancements in both optical and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

A General Solvothermal Route to the Synthesis of CoTe, Ag₂Te/Ag, and CdTe Nanostructures with Varied Morphologies

Jiang

Zhu

2010

Eur J Inorg Chem

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A general and facile surfactant-assisted solvothermal route was developed for the synthesis of CoTe, Ag 2 Te/Ag, and CdTe nanostructures using the corresponding metal salt, Na 2 TeO 3 , ascorbic acid, and polyvinyl pyrrolidone (PVP) or cetyltrimethylammonium bromide (CTAB) in mixed solvents of ethanolamine and water. It was also found that the morphology of the product varied dramatically when using dif-

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Section: Introductionmentioning

confidence: 99%

A General Solvothermal Route to the Synthesis of CoTe, Ag₂Te/Ag, and CdTe Nanostructures with Varied Morphologies

Jiang

Zhu

2010

Eur J Inorg Chem

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“…In the case of CdTe, on the other hand, the valence band position is desirably around -5.5 eV, which provides much better HOMO alignment for the hole injection. However, this high-positioned valence band undesirably promotes CdTe oxidation [18] at the same time, which thus critically necessitates efficient encapsulation.…”

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confidence: 99%

High-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperature

et al. 2015

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We report high-efficiency CdTe/CdS core/shell nanocrystals synthesized in water by epitaxially growing CdS shells on aqueous CdTe cores at room temperature, enabled by the controlled release of S species under low-intensity ultraviolet (UV) light illumination. The resulting photo-induced dissociation of S2O32− ions conveniently triggers the formation of critical two-dimensional CdS epitaxy on the CdTe surface at room temperature, as opposed to initiating the growth of individual CdS core-only nanocrystals. This controlled colloidal hetero-epitaxy leads to a substantial increase in the photoluminescence (PL) quantum yield (QY) of the shelled nanocrystals in water (reaching 64%). With a systematic set of studies, the maximum PL QY is found to be almost independent of the illuminating UV intensity, while the shell formation kinetics required for reaching the maximum QY linearly depends on the illuminating UV intensity. A stability study of the QD films in air at various temperatures shows highly improved thermal stability of the shelled QDs (up to 120 °C in ambient air). These results indicate that the proposed aqueous CdTe/CdS core/shell nanocrystals hold great promise for applications requiring efficiency and stability. [Figure not available: see fulltext.] © 2015, Tsinghua University Press and Springer-Verlag Berlin Heidelberg

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“…However, there are other publications reporting low HOMO levels of À5.5 eV or even À5.8 eV for CdTe NCs. 19,38 The discrepancy might be caused by different sizes and/or shapes of the samples in different measurements, as well as the fact that cyclic voltammetry is not an accurate method to determine the band position. If the CdTe HOMO level is as low as À5.5 eV, CdTe NCs might still be a good candidate as an acceptor material in hybrid PVs.…”

Section: Exciton Generation In Hybrid Pvsmentioning

confidence: 99%

The renaissance of hybrid solar cells: progresses, challenges, and perspectives

Gao

Ren

Wang³

2013

Energy Environ. Sci.

113

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Solution-processed hybrid solar cells, a blend of conjugated polymers and semiconducting nanocrystals, are a promising candidate for next-generation energy-conversion devices. The renaissance of this field in recent years has yielded a much deeper understanding of optoelectronic interactions in organicinorganic hybrid systems. In this article, we review the state-of-the-art progress in hybrid bulk heterojunction solar cells, covering new materials design, interfacial interaction, and processing control. Furthermore, critical challenges that determine photovoltaic performance and prospects for future directions are discussed. Broader context Global warming and fossil fuel depletion are driving humans to explore green and renewable energy sources. Solution-processed hybrid photovoltaics, a blend of conjugated polymers and semiconducting nanocrystals, are a promising candidate to convert sunlight into electricity. Hybrid photovoltaics combine the unique advantages of organic and inorganic semiconductors, i.e., cost-effective manufacturing processes, tunable absorption regimes, high charge carrier mobility, and high dielectric constant. The study of hybrid photovoltaics is multidisciplinary, covering organic and inorganic semiconducting materials, surface ligand design, device structure design, and efficiency optimization. This review article gives an in-depth understanding of photovoltaic processes in the operation of hybrid photovoltaics, and relates primary studies with these processes. Current challenges of hybrid photovoltaics are also discussed, and directions for further research are proposed.

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Cluster synthesis of branched CdTe nanocrystals for use in light-emitting diodes

Cited by 24 publications

References 31 publications

A General Solvothermal Route to the Synthesis of CoTe, Ag₂Te/Ag, and CdTe Nanostructures with Varied Morphologies

A General Solvothermal Route to the Synthesis of CoTe, Ag₂Te/Ag, and CdTe Nanostructures with Varied Morphologies

High-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperature

The renaissance of hybrid solar cells: progresses, challenges, and perspectives

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Cluster synthesis of branched CdTe nanocrystals for use in light-emitting diodes

Cited by 24 publications

References 31 publications

A General Solvothermal Route to the Synthesis of CoTe, Ag2Te/Ag, and CdTe Nanostructures with Varied Morphologies

A General Solvothermal Route to the Synthesis of CoTe, Ag2Te/Ag, and CdTe Nanostructures with Varied Morphologies

High-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperature

The renaissance of hybrid solar cells: progresses, challenges, and perspectives

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A General Solvothermal Route to the Synthesis of CoTe, Ag₂Te/Ag, and CdTe Nanostructures with Varied Morphologies

A General Solvothermal Route to the Synthesis of CoTe, Ag₂Te/Ag, and CdTe Nanostructures with Varied Morphologies