Phototransport in colloidal nanoplatelets array

Lhuillier, Emmanuel; Dayen, Jean‐François; Thomas, Daniel O.; Robin, Adrien; Ithurria, Sandrine; Aubin, H.; Dubertret, Benoît

doi:10.1002/pssc.201510165

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…Cadmium selenide (CdSe) nanoplatelets (NPLs) have recently attracted great interest because of their distinguished properties originating from their strong quantum confinement along the z -direction. They possess a narrow emission linewidth, giant oscillator strength, a large absorption cross section, and reduced Auger recombination. , Thanks to these outstanding features, CdSe NPLs can be utilized as an active medium for a vast range of applications that include light-emitting diodes, colloidal quantum well lasers, luminescent solar concentrators, detectors, and phototransistors. − Typically, CdSe NPLs exhibit emission peaks around 460 nm for three monolayers (MLs), 515 nm for four MLs, and 550 nm for five MLs of thickness, respectively. Therefore, the emission of CdSe NPLs can be tuned by varying the number of MLs (thickness) .…”

Section: Introductionmentioning

confidence: 99%

Near-Infrared Emission from CdSe-Based Nanoplatelets Induced by Ytterbium Doping

et al. 2023

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Cadmium selenide (CdSe) nanoplatelets (NPLs) have attracted significant attention thanks to their favorable optical properties, including narrow emission linewidths, reduced Auger recombination, and a high absorption cross section. However, the photoluminescence (PL) quantum yield (QY) in the near-infrared (NIR) region is poor as compared to that in the visible region. Doping of metal ions is proven to be a successful strategy for inducing Stokes-shifted NIR emission. Here, we report the first account of the successful doping of ytterbium (Yb) into CdSe NPLs by a modified seeded-growth method. The successful incorporation of divalent Yb ions into CdSe NPLs resulted in an additional NIR emission apart from their excitonic emission. By optimizing the dopant concentration, we observed an impressive PL QY of ∼55% for these Yb-doped NPLs. Detailed elemental and optical characterizations were conducted to understand the emerging photophysical properties of these Yb-doped NPLs. These NIR-emitting lanthanide-doped CdSe NPLs might have applications in the next-generation bioimaging, night vision, and photodetection.

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Section: Introductionmentioning

confidence: 99%

Near-Infrared Emission from CdSe-Based Nanoplatelets Induced by Ytterbium Doping

et al. 2023

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“…Therefore, the present work focuses on a direct selfassembly of NPL-stacks in aqueous solution (without polymer encapsulation) to open up the possible applications and methods, such as various gelation methods, [16][17][18][19] inkjet printing, [20] photocatalysis, [21] photo-electrochemistry, [12,13,22] photodetection [23] and sensing, [24] light emitting diodes, [25] and many more. For this approach CdSe NPLs are first transferred to aqueous solution via ligand exchange to 11-mercaptoundecanoic acid.…”

Section: Introductionmentioning

confidence: 99%

Self‐Assembly of Semiconductor Nanoplatelets into Stacks Directly in Aqueous Solution

Graf,

Tran,

Rosebrock

et al. 2023

Adv Materials Inter

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Since their discovery, cadmium chalcogenide nanoplatelets (NPLs) gained a lot of interest, not only due to their beneficial characteristic, but also because of their high affinity to self‐assemble into ordered stacks. Interestingly, the stacks showed both the properties of the single NPLs and new collective features, such as charge carrier transport within the stacks. Until now, the stacking was, to the best of the knowledge, only performed in non‐polar media mostly through the addition of antisolvents with higher polarity. Due to the fact, that many applications (e.g., photocatalysis) or procedures (such as gelation) occur in water, a route to self‐assemble stacks directly in aqueous solution is needed. In this work a new synthesis route is thus introduced to produce stacks directly in aqueous media. The NPLs are phase transferred with mercaptocarboxylic acids to an aqueous KOH solution followed by an addition of less polar antisolvents to initialize the stacking (e.g., tetrahydrofuran). Furthermore, a mechanism of the stacking as well as four possible driving forces involved in the process are proposed supported by transmission electron microscopy, dynamic light scattering, infrared spectroscopy, and x‐ray photoelectron spectroscopy measurements.

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“…[36] In previous reports, the NPL-NPL distance within the stacks and its possible influence on the optical and photo-electrochemical properties was hardly addressed. Considering the fact that smaller distances should greatly enhance charge carrier tunneling due to larger electronic wavefunction overlap of neighboring NPLs, [36] a decrease of the NPL-NPL distance might pave the way toward future applications of NPL assemblies for example, as (photo)transistors, [37][38][39][40] photoconductors, [40] sensors, [26] for photodetection, [41][42][43] in solar cells, or as light emitting diodes. [44] To manipulate the NPL-NPL distance, ligand exchange is a straightforward method since the NPL ligands mainly govern the distance in the stacks.…”

Section: Introductionmentioning

confidence: 99%

Interparticle Distance Variation in Semiconductor Nanoplatelet Stacks

Graf

Schlosser

Zámbó

et al. 2022

Adv Funct Materials

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In the large field of research on nanoplatelets (NPLs), their strong tendency to self-assemble into ordered stacks and the resulting changes in their properties are of great interest. The assembly reveals new characteristics such as the charge carrier transport through the NPL assembly or altered optical properties. In particular, a reduced distance should enhance the charge carrier transport due to higher electronic coupling of neighboring NPLs, and therefore, is the focus of this work. To modify the inter-particle distances, the straightforward method of ligand exchange is applied. Various CdSe and CdSe/CdX (hetero-) NPLs serve as building blocks, which not only display different material combinations but also different types of heterostructures. The surface-to-surface distance between the stacked NPLs can be reduced to below 1 nm, thus, to less than the half compared to assemblies of pristine NPLs. Moreover, for certain NPLs stacking is only enabled by the ligand exchange. To characterize the ligand exchanges and to investigate the influences of the reduced distances, photo-electrochemical measurements, fluorescence spectroscopy, energy dispersive X-ray spectroscopy, nuclear magnetic resonance, and X-ray photoelectron spectroscopy are performed. It is possible to show higher photocurrents for smaller distances, indicating enhanced charge transport ability within those stacks.

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Phototransport in colloidal nanoplatelets array

Cited by 6 publications

References 24 publications

Near-Infrared Emission from CdSe-Based Nanoplatelets Induced by Ytterbium Doping

Near-Infrared Emission from CdSe-Based Nanoplatelets Induced by Ytterbium Doping

Self‐Assembly of Semiconductor Nanoplatelets into Stacks Directly in Aqueous Solution

Interparticle Distance Variation in Semiconductor Nanoplatelet Stacks

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