Room‐Temperature Synthesis of Air‐Stable and Size‐Tunable Luminescent ZnS‐Coated Cd<sub>3</sub>P<sub>2</sub> Nanocrystals with High Quantum Yields

Ojo, Wilfried-Solo; Xu, Shu; Delpech, Fabien; Nayral, Céline; Chaudret, Bruno

doi:10.1002/ange.201104864

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…Quantum dots have been demonstrated to have high photoluminescence (PL) quantum yields and a size tunable PL over the visible and NIR spectrum, making this material ideal for LEDs and other optical applications. [98][99][100] The Cd3P2 sample was prepared with the impregnated powder method by mixing equivalent weights of h-BN and precipitated Cd3P2 NPs. Then 30 mg of the powdered mixture was impregnated with a 16 mM TEKPol TCE solution.…”

Section: Resultsmentioning

confidence: 99%

“…37,52,101 The 31 P CPMAS solid-state NMR spectrum of Cd 3 P 2 yielded a broad 31 P signal centered at −300 ppm, consistent with previous reports (Figure 5A, top spectrum). 44,99,102 Acquisition of a 31 P CPMAS solid-state NMR spectrum with up to 100 s of spin diffusion time leads to the appearance of a narrower 31 P NMR signal at −225 ppm that is attributed to core phosphides (Figure 5A, lower spectrum). The chemical shift of the core phosphides is slightly more negative in comparison to the previously reported 31 P chemical shift of bulk Cd 3 P 2 (peaks between −125 and −175 ppm).…”

Section: ■ Introductionmentioning

confidence: 99%

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Probing the Surface Structure of Semiconductor Nanoparticles by DNP SENS with Dielectric Support Materials

et al. 2019

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Surface characterization is crucial for understanding how the atomic-level structure affects the chemical and photophysical properties of semiconducting nanoparticles (NPs). Solid-state nuclear magnetic resonance spectroscopy (NMR) is potentially a powerful technique for the characterization of the surface of NPs, but it is hindered by poor sensitivity. Dynamic nuclear polarization surface enhanced NMR spectroscopy (DNP SENS) has previously been demonstrated to enhance the sensitivity of surfaceselective solid-state NMR experiments by one to two orders of magnitude. Established sample preparations for DNP SENS experiments on NPs require the dilution of the NPs on mesoporous silica. Using hexagonal boron nitride (h-BN) to disperse the NPs doubles DNP enhancements and absolute sensitivity as compared to standard protocols with mesoporous silica. Alternatively, precipitating the NPs as powders, mixing them with h-BN, then impregnating the powdered mixture with radical solution leads to further four-fold sensitivity enhancements by increasing the concentration of NPs in the final sample. This modified procedure provides a factor 9 improvement in NMR sensitivity as compared to previously established DNP SENS procedures, enabling challenging homonuclear and heteronuclear 2D NMR experiments on CdS, Si and Cd3P2 NPs. These experiments allow NMR signals from the surface, subsurface and core sites to be observed and assigned. For example, we demonstrate that the acquisition of DNP-enhanced 2D 113Cd113Cd correlation NMR experiments on CdS NPs and natural isotropic abundance 2D 13C29Si HETCOR of functionalized Si NPs. These experiments provide a critical understanding of NP surface structures.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Probing the Surface Structure of Semiconductor Nanoparticles by DNP SENS with Dielectric Support Materials

et al. 2019

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“…24,25 The high binding affinity of organic amines to cadmium salts is well-known and was already used to transfer cadmium halides and acetates into nonpolar solvents using OLA as a chargetransfer agent. 26,27 Thus, She et al successfully transferred S 2−capped CdSe nanoplatelets from a polar into a nonpolar medium. 28 However, the introduction of bulky ligands can again worsen the transport properties in the NC solids.…”

Section: Resultsmentioning

confidence: 99%

Hybrid N-Butylamine-Based Ligands for Switching the Colloidal Solubility and Regimentation of Inorganic-Capped Nanocrystals

et al. 2017

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We report on a simple and effective technique of tuning the colloidal solubility of inorganic-capped CdSe and CdSe/CdS core/shell nanocrystals (NCs) from highly polar to nonpolar media using n-butylamine molecules. The introduction of the short and volatile organic amine mainly results in a modification of the labile diffusion region of the inorganic-capped NCs, enabling a significant extension of their dispersibility and improving the ability to form long-range assemblies. Moreover, the hybrid n-butylamine/inorganic capping can be thermally decomposed under mild heat treatment, making this approach of surface functionalization well-compatible with a low-temperature, solution-processed device fabrication. Particularly, a field-effect transistor-based on n-butylamine/Ga-I-complex-capped 4.5 nm CdSe NC solids shows excellent transport characteristics with electron mobilities up to 2 cm/(V·s) and a high current modulation value (>10) at a low operation voltage (<2 V).

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“…Cd 3 P 2 CQDs thereby possess great potential as a promising candidate material for light harvesting throughout the visible and near-IR region. Although being equally prospective compared to the widely explored II-VI and IV-VI group CQDs, respectively represented by CdX and PbX (X = S, Se and Te), the exploitation of II-V CQDs has lagged far behind due to limited synthesis strategies [18,19]. Fortunately, the qualities of II-V group CQDs (Cd 3 P 2 [20], Cd 3 As 2 [21] and Zn 3 P 2 [22]) in terms of size control, monodispersity and crystallinity have significantly improved over the past few years.…”

Section: Introductionmentioning

confidence: 99%

PbS/Cd₃P₂quantum heterojunction colloidal quantum dot solar cells

et al. 2014

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Here, we demonstrated the quantum heterojunction colloidal quantum dot (CQD) solar cells employing the PbS CQDs/Cd3P2 CQDs architecture in which both the p-type PbS and n-type Cd3P2 CQD layers are quantum-tunable and solution-processed light absorbers. We synthesized well-crystallized and nearly monodispersed tetragonal Cd3P2 CQDs and then engineered their energy band alignment with the p-type PbS by tuning the dot size and hence the bandgap to achieve efficient light absorbing and charge separation. We further optimized the device through the Ag-doping strategy of PbS CQDs that may leverage an expanded depletion region in the n-layer, which greatly enhances the photocurrent. The resulting devices showed an efficiency of 1.5%.

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Room‐Temperature Synthesis of Air‐Stable and Size‐Tunable Luminescent ZnS‐Coated Cd₃P₂ Nanocrystals with High Quantum Yields

Cited by 7 publications

References 15 publications

Probing the Surface Structure of Semiconductor Nanoparticles by DNP SENS with Dielectric Support Materials

Probing the Surface Structure of Semiconductor Nanoparticles by DNP SENS with Dielectric Support Materials

Hybrid N-Butylamine-Based Ligands for Switching the Colloidal Solubility and Regimentation of Inorganic-Capped Nanocrystals

PbS/Cd₃P₂quantum heterojunction colloidal quantum dot solar cells

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Room‐Temperature Synthesis of Air‐Stable and Size‐Tunable Luminescent ZnS‐Coated Cd3P2 Nanocrystals with High Quantum Yields

Cited by 7 publications

References 15 publications

Probing the Surface Structure of Semiconductor Nanoparticles by DNP SENS with Dielectric Support Materials

Probing the Surface Structure of Semiconductor Nanoparticles by DNP SENS with Dielectric Support Materials

Hybrid N-Butylamine-Based Ligands for Switching the Colloidal Solubility and Regimentation of Inorganic-Capped Nanocrystals

PbS/Cd3P2quantum heterojunction colloidal quantum dot solar cells

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Product

Resources

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Room‐Temperature Synthesis of Air‐Stable and Size‐Tunable Luminescent ZnS‐Coated Cd₃P₂ Nanocrystals with High Quantum Yields

PbS/Cd₃P₂quantum heterojunction colloidal quantum dot solar cells