Core-shell ZnO@CuInS2 hexagonal nanopyramids with improved photo-conversion efficiency

Das, Kausik; Ghosh, Surajit; Chakrabarti, Kaushik; Paul, Sumana; Sinha, Godhuli; Lahtinen, Jouko; Jana, Debnarayan; De, S. K.

doi:10.1016/j.solmat.2015.07.010

Cited by 12 publications

(4 citation statements)

References 46 publications

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“…CIS/ZnS core/shell QDs have also been used as inorganic hole transporting material in perovskite solar cells, and PCEs of 8.38% were achieved by using a TiO 2 /MAPbI 3 /CIS-QD/Au device architecture . In addition, spin coated layers of colloidal ZnO/CIS core/shell nanopyramids on p-type silicon were also used as an antireflection coating and photoconverter in a Si solar cell, with PCEs of up to 10% being achieved …”

Section: Photovoltaic Applicationsmentioning

confidence: 99%

Compound Copper Chalcogenide Nanocrystals

et al. 2017

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This review captures the synthesis, assembly, properties, and applications of copper chalcogenide NCs, which have achieved significant research interest in the last decade due to their compositional and structural versatility. The outstanding functional properties of these materials stems from the relationship between their band structure and defect concentration, including charge carrier concentration and electronic conductivity character, which consequently affects their optoelectronic, optical, and plasmonic properties. This, combined with several metastable crystal phases and stoichiometries and the low energy of formation of defects, makes the reproducible synthesis of these materials, with tunable parameters, remarkable. Further to this, the review captures the progress of the hierarchical assembly of these NCs, which bridges the link between their discrete and collective properties. Their ubiquitous application set has cross-cut energy conversion (photovoltaics, photocatalysis, thermoelectrics), energy storage (lithium-ion batteries, hydrogen generation), emissive materials (plasmonics, LEDs, biolabelling), sensors (electrochemical, biochemical), biomedical devices (magnetic resonance imaging, X-ray computer tomography), and medical therapies (photochemothermal therapies, immunotherapy, radiotherapy, and drug delivery). The confluence of advances in the synthesis, assembly, and application of these NCs in the past decade has the potential to significantly impact society, both economically and environmentally.

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Section: Photovoltaic Applicationsmentioning

confidence: 99%

Compound Copper Chalcogenide Nanocrystals

et al. 2017

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“…The proper energy band alignments across the interface can effectively improve the charge separation on both semiconductor units by retarding the recombination process of photogenerated electron−hole pairs. 1,2 Depending upon the relative band positions of two different semiconductors, NHS can be classified as type-I, type-II, or z-scheme heterostructure. 3−5 Moreover, crystallographic epitaxial growth of one semiconductor over another facilitates the charge separation process.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Nanoscale heterostructures (NHS) in which two semiconductors are integrated into one nanoscale hybrid structure have recently received more attention because of their intriguing interfacial charge transfer process under photoexcitation. The proper energy band alignments across the interface can effectively improve the charge separation on both semiconductor units by retarding the recombination process of photogenerated electron–hole pairs. , Depending upon the relative band positions of two different semiconductors, NHS can be classified as type-I, type-II, or z-scheme heterostructure. − Moreover, crystallographic epitaxial growth of one semiconductor over another facilitates the charge separation process. , Among the various types of interfaces, type-II heterostructures are most desirable as photogenerated electrons and holes moved to the opposite direction, giving a spatial separation of the electrons and holes in different semiconductors. Such type of combination of semiconductors is very useful for photocatalytic and photovoltaic applications to improve the efficiency.…”

Section: Introductionmentioning

confidence: 99%

Efficient Charge Separation in Plasmonic ZnS@Sn:ZnO Nanoheterostructure: Nanoscale Kirkendall Effect and Enhanced Photophysical Properties

Paul

Ghosh

2018

Langmuir

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Tetravalent Sn doped ZnO nanocrystals show excellent plasmonic absorbance in the visible region. Plasmonic ZnS@Sn:ZnO core-shell heterostructures have been synthesized by the anion exchange process where the O is exchanged by S anion. An increase of sulfur concentration induces interior hollow structures arising from the different diffusion rates of O and S ions. Gradual transformation of wurtztie ZnO nanocrystals in the anion exchange process stabilizes the wurtzite crystalline phase of ZnS. Carrier concentration and various types of intrinsic defect states in both ZnO and ZnS result in ultraviolet, blue, and green emissions. The coexistence of exciton-plasmon coupling in the same nanoparticle and efficient electron-hole separation in type II heterostructure increases the photocatalytic activity and photo current gain.

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“…Recent developments show that core-shell nano heterostructures deployed for photovoltaic and photocatalysis applications indicate substantial potential for practical use [8]. Type II core-shell structures [9][10][11] have an alignment of va-S. Sikdar et al / Processing and Application of Ceramics 15 [1] (2021) 58-68 lence and conduction bands such that one charge carrier is confined to the core while the other is confined to the shell. In addition, a combination of phases used in the core and shell allow absorption of wavelengths that would otherwise not be possible with a single material.…”

Section: Introductionmentioning

confidence: 99%

Effect of calcination atmosphere on structural, optical and photocatalytic activity of TiO2/SnS2 core-shell nanostructures in the reduction of aqueous Cr(VI) to Cr(III)

Sikdar

Thomas

Ramachandra

et al. 2021

PAC

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Conversion of Cr(VI) to Cr(III) in mitigating pollution of water bodies is of significant importance to public health due to the fact that Cr(VI) is known to be a potent carcinogen, while Cr(III) is relatively low in toxicity. Photocatalytic approaches are considered as important means to achieve this reduction. Here, TiO2/SnS2 core-shell nanostructures have been produced using a single-step hydrothermal method and its photocatalytic activity is tested for the reduction of aqueous Cr(VI). The structural and optical properties of the as-synthesized products are characterized by XRD, HRTEM, Raman, FTIR, XPS and DRS techniques. The present work reveals that by calcining the core-shell nanoparticles in Ar atmosphere a defective Ti3O5 phase is formed as the core with low band gap, and hence, offers improved light absorption in the visible range. However, its photoactivity was found to be lower than that of the core-shell nanoparticles annealed in oxidizing atmosphere. The observed lower photoreduction was due to the presence of midgap states which acted as recombination centres and hence, reduced the photocatalytic activity.

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Core-shell ZnO@CuInS2 hexagonal nanopyramids with improved photo-conversion efficiency

Cited by 12 publications

References 46 publications

Compound Copper Chalcogenide Nanocrystals

Compound Copper Chalcogenide Nanocrystals

Efficient Charge Separation in Plasmonic ZnS@Sn:ZnO Nanoheterostructure: Nanoscale Kirkendall Effect and Enhanced Photophysical Properties

Effect of calcination atmosphere on structural, optical and photocatalytic activity of TiO2/SnS2 core-shell nanostructures in the reduction of aqueous Cr(VI) to Cr(III)

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