Topics

PubMed Journals Articles About "CsPbBr3 Quantum Dots Assisted Crystallization Solution Processed Perovskite" RSS

16:06 EST 15th December 2019 | BioPortfolio

CsPbBr3 Quantum Dots Assisted Crystallization Solution Processed Perovskite PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest CsPbBr3 Quantum Dots Assisted Crystallization Solution Processed Perovskite articles that have been published worldwide.

More Information about "CsPbBr3 Quantum Dots Assisted Crystallization Solution Processed Perovskite" on BioPortfolio

We have published hundreds of CsPbBr3 Quantum Dots Assisted Crystallization Solution Processed Perovskite news stories on BioPortfolio along with dozens of CsPbBr3 Quantum Dots Assisted Crystallization Solution Processed Perovskite Clinical Trials and PubMed Articles about CsPbBr3 Quantum Dots Assisted Crystallization Solution Processed Perovskite for you to read. In addition to the medical data, news and clinical trials, BioPortfolio also has a large collection of CsPbBr3 Quantum Dots Assisted Crystallization Solution Processed Perovskite Companies in our database. You can also find out about relevant CsPbBr3 Quantum Dots Assisted Crystallization Solution Processed Perovskite Drugs and Medications on this site too.

Showing "CsPbBr3 quantum dots assisted crystallization solution processed perovskite" PubMed Articles 1–25 of 8,700+

CsPbBr3 quantum dots assisted crystallization of solution-processed perovskite films with preferential orientation for high performance perovskite solar cells.

The performance of hybrid perovskite solar cells (PSCs) is significantly influenced by the crystallization and morphology of perovskite films. Herein, a novel method of CsPbBr3 quantum dots (QDs) assisted nucleation is applied to prepare high quality solution-processed MAPbI3 films by employing CsPbBr3 QDs as an additive into diethyl ether anti-solvent. The appropriate amount of CsPbBr3 QDs can act as effective heterogeneous nucleation centers, leading to the formation of smooth and pinhole-free perovskite ...


Efficient and Stable PbS Quantum Dot Solar Cells by Triple-Cation Perovskite Passivation.

Solution-processed quantum dots (QDs) have a high potential for fabricating low cost, flexible and large-scale solar energy harvesting devices. It has recently been demonstrated that hybrid devices employing a single monovalent cation perovskite solution for PbS QD surface passivation exhibit enhanced photovoltaic performance when compared to standard ligand passivation. Herein we demonstrate that the use of a triple cation Cs0.05(MA0.17FA0.83)0.95Pb(I0.9Br0.1)3 perovskite composition for surface passivatio...

Multi-Photon Excitation of CsPbBr Perovskite Quantum Dots: How Many Electrons Can One PQD Donate to Multiple Molecular Acceptors?

Metastable multi-excitonic states (MES) of semiconductor quantum dots can be involved in multi-electron transfer reaction, which opens new perspectives in nanomaterials-based opto-electronic applications. Herein, we demonstrate the generation of MES in CsPbBr3 perovskite quantum dots (PQD) and its dissociation dynamics through multiple electrons transfer to molecular electron acceptors, anthraquinones (AQs), bound to the PQD surface by carboxylic anchor. As many as 14 excitons are produced at excitation den...


Exploring Orbit-Orbit Interaction in Relationship with Photoluminescence Quantum Efficiency in Perovskite Quantum Dots through Rashba Effects.

Metal halide perovskite quantum dots attract significant research interest in recent years due to their exceptional optical properties, such as tunable emission wavelength, strong quantum confinement and suppressed non-radiative recombination via surface passivation. However, the presence of dark states with low emission rate in perovskite quantum dots due to the strong spin-orbital coupling (SOC) and Rashba effects may suppress light emission efficiency. Strategies of reducing bright-to-dark exciton conver...

Self-driven visible-near infrared photodetector with vertical CsPbBr3/PbS quantum dots heterojunction structure.

Self-driven photodetectors are widely used in communication and imaging. As a newly developed semiconductor material, perovskite quantum dots (QDs) are not only bandgap tunable, but also easy to be combined with other materials. In this paper, a vertical structure self-driven photodetector based on heterojunction of CsPbBr3 QDs and PbS QDs is proposed, and the device is prepared by solution spin coating method. The device can work in visible and near infrared (400~1130 nm) regions, and has excellent perform...

High-Energy Photon Spectroscopy Using All Solution-Processed Heterojunctioned Surface-Modified Perovskite Single Crystals.

Organic-inorganic hybrid perovskites have been intensively studied for their use in optoelectronic devices due to their utilization of low-cost, earth-abundant precursors that are solution-processed at low-temperatures into high-quality devices. Despite this progress, interdevice variability and long-term stability have prevented the widespread commercial adoption of perovskite devices, especially for high-energy photon detectors. Using methylammonium lead iodide perovskite single crystals grown via inverse...

Hole Boosted Cu(Cr,M)O2 Nanocrystals for All-Inorganic CsPbBr3 Perovskite Solar Cells.

All-inorganic CsPbBr3 perovskite solar cell (PSC) is a promising solution to balance the high efficiency and poor stability of state-of-the-art organic-inorganic PSCs. Through setting inorganic hole-transporting layers at perovskite/electrode interface undoubtedly reduces charge carrier recombination without sacrificing superiority in ambient air atmosphere. Herein, M-substituted, p-type inorganic Cu(Cr,M)O2 (M = Ba2+, Ca2+ or Ni2+) nanocrystals with enhanced hole-transporting characteristics by increasing ...

Graphite-N doped graphene quantum dots as semiconductor additive in perovskite solar cells.

Efficient charge transport is especially important for achieving high performance of perovskite solar cells (PSCs). Here, molecularly designed graphite-nitrogen doped graphene quantum dots (GN-GQDs) act as functional semiconductor additive in perovskite film. GN-GQDs with abundant N active sites participate in the crystallization of perovskite film and effectively passivate the grain boundary (GB) trap states by Lewis base-acid interaction. Moreover, the semiconductive GN-GQDs at GBs exhibit matched energy ...

Differences between Neutrophilic Granulocytes and Lymphocytes in Fixation of Quantum Dots of Different Composition.

Studies by flow cytometry, scanning electron microscopy, and X-ray microanalysis have shown that fixation/internalization of quantum dots differ in lymphocytes and neutrophilic granulocytes. Punctate fixation of quantum dots to cell surface is characteristic of lymphocytes, while phagocytosis with perinuclear location of quantum dot aggregations is characteristic of neutrophils. The presence of complex functional groups on the surface of quantum dots can inhibit significantly the fixation/internalization of...

High-performance solution-processed colloidal quantum dots-based tandem broadband photodetectors with dielectric interlayer.

Recently, great attention has been paid to IV-VI colloidal quantum dots (CQDs) for their high photosensitivity, solution processability and low cost. Also, metal halide perovskites are very promising materials to realize the high-performance solution-processed visible-light photodetectors due to their cost-effective manufacturing, tunable absorption and photoluminescence in whole visible spectrum. In this paper, we present solution-processed CQDs-based tandem broadband photodetectors with low dark-current a...

Ultrathin lead bromide perovskite platelets spotted with europium(ii) bromide dots.

We describe here the preparation of a novel nanohybrid comprising a two-layer cesium lead bromide nanoplatelet, [CsPbBr3]PbBr4 NPL, containing europium(ii) bromide (EuBr2) nanodots, by ultrasound/heating treatment of toluene dispersions of the CsPbBr3 nanomaterial in the presence of EuBr2 nanodots. The hybrid nanoplatelets exhibit strong excitonic and narrow emission peaks characteristic of ultrathin NPLs at 430 and 436 nm, respectively.

Aggregative ways of graphene quantum dots with nitrogen-rich edges for direct emission spectrophotometric estimation of glucose.

We report a facile one step in-situ synthesis of amino-functionalized graphene dots. These quantum dots were employed for the detection of glucose in both standard aqueous solutions and commercially available fruit juice to assess its practicability. The characterization of the quantum dots revealed that they were decorated with amine functionality. Additionally, the interaction between glucose and amine functionalized graphene quantum dots gave enhancement in the UV-vis absorption and photoluminescence (PL...

Probing Perovskite Photocatalysis. Interfacial Electron Transfer between CsPbBr and Ferrocene Redox Couple.

Interfacial charge transfer between semiconductor nanocrystal and a molecular relay is an important step in nanomaterial photocatalysis. The ferrocene redox couple (Fc+/Fc0, E0 = -4.9 eV vs. vacuum) has now been used as a model redox relay system to investigate photocatalytic properties of CsPbBr3 perovskite nanocrystals. The photocatalytic reduction of ferrocenium (Fc+) to ferrocene (Fc0) with CsPbBr3 nanocrystals was dictated by the surface interactions. Whereas a rapid quenching and subsequent recovery o...

Achieving long carrier lifetime and high optical gain in all-inorganic CsPbBr perovskite films via top and bottom surface modification.

Solution-processed all-inorganic CsPbX3(X = Br, I, and Cl) perovskites are proven to be promising materials for various optoelectronic applications. However, CsPbX3 films as optical gain media were confronted with unsatisfactory surface coverage and inferior photoluminescence performance when compared with their colloidal nanocrystal counterparts. Herein, we demonstrate a strategy for improving the optical properties via modification of both top and bottom surfaces of CsPbBr3 films. The treated perovskite f...

Hot-air assisted fully air-processed barium incorporated CsPbI2Br perovskite thin films for highly efficient and stable all-inorganic perovskite solar cells.

Replacement of conventional organic cations by thermally stable inorganic cations in perovskite solar cells (PSCs) is one of the promising approach to make thermally-stable photovoltaics. How-ever, conventional spin-coating and solvent-engineering processes in controlled inert atmosphere hampers the upscaling. In this study, we demonstrated, a dynamic hot-air (DHA) casting process to con-trol the morphology and stability of all inorganic PSCs which is processed in ambient condition and free from conventiona...

Nonlinear optical properties of InP/ZnS core-shell quantum dots.

The nonlinear optical properties of InP/ZnS core-shell quantum dots toluene solution were investigated by Z-scan and transient absorption technique with femtosecond pulses and nanosecond pulses at 532 nm wavelength respectively. The research results showed that InP/ZnS core-shell quantum dots exhibited saturated absorption under the excitation of femtosecond pulses, and the switch from saturation absorption to reverse saturation absorption was observed under the excitation of nanosecond pulses. The mechanis...

Encapsulating Perovskite Quantum Dots in Iron-Based Metal-Organic Frameworks for Efficient Photocatalytic CO2 Reduction.

Improving the stability of lead halide perovskite quantum dots (QDs) in a reaction system containing water is the key point for their practical applications in artificial photosynthesis. Herein, we encapsulate low-cost CH3NH3PbI3 (MAPbI3) perovskite QDs in the pores of earth-abundant Fe-porphyrin based metal organic framework of PCN-221(Fex) by a sequential deposition route, to construct a serious of composite photocatalysts of MAPbI3@PCN-221(Fex) (x = 0~1). Benefiting from the protection of the framework o...

Inlaid ReS Quantum Dots in Monolayer MoS.

Two-dimensional (2D) transition metal dichalcogenides (TMDs) are prospective materials for quantum devices owing to their inherent 2D confinements. They also provide a platform to realize even lower-dimensional in-plane electron confinement, , 0D quantum dots, for exotic physical properties. However, fabrication of such laterally confined monolayer (1L) nanostructure in 1L crystals remains challenging. Here we report the realization of 1L ReS quantum dots epitaxially inlaid in 1L MoS by a two-step chemical ...

Self-assembly of a robust hydrogen-bonded octylphosphonate network on cesium lead bromide perovskite nanocrystals for light-emitting diodes.

We report the self-assembly of an extensive inter-ligand hydrogen-bonding network of octylphosphonates on the surface of cesium lead bromide nanocrystals (CsPbBr3 NCs). The post-synthetic addition of octylphosphonic acid to oleic acid/oleylamine-capped CsPbBr3 NCs promoted the attachment of octylphosphonate to the NC surface, while the remaining oleylammonium ligands maintained the high dispersability of the NCs in non-polar solvent. Through powerful 2D solid-state 31P-1H NMR, we demonstrated that an ethyl ...

Highly Efficient and Stable Perovskite Solar Cells Using an Effective Chelate-Assisted Defect Passivation Strategy.

Due to the sensitivity of the perovskite solar cells to the subtle changes under the ambient atmosphere conditions, many problems have aroused great attention such as collapse of the perovskite structure and efficiency quickly drops . Among them, internal defect also is a big obstacle for high-quality poly-crystalline perovskites, at present it is still difficult to control the density of the trapping sites. Herein, we use a bidentate chelating agent, thenoyltrifluoroacetone (ttfa), to effectively controls ...

Shining Emitter in Stable Host: Design Halide Perovskite Scintillators for X-Ray Imaging from Commercial Concept.

Halide perovskite (HP) nanocrystals (NCs) have recently shown great potential for X-ray detection and imaging. However, the practical application is still a long way to go with lots of technical requirements waiting to be fulfilled, including structure optimization, stability enhancement, and cost reduction. A design principle in this beginning stage is urgently needed but still lacking. Herein, with an "emitter-in-matrix" principle refined from commercial scintillators, CsPbBr3@Cs4PbBr6 with emissive CsPbB...

Highly Luminescent and Water Resistant CsPbBr3-CsPb2Br5 Perovskite Nanocrystals Coordinated with Partially Hydrolyzed Poly(methyl methacrylate) and Polyethylenimine.

All inorganic lead halide perovskite nanocrystals (PNCs) typically suffer from poor stability against moisture and UV radiation, as well as degradation during thermal treatment. The stability of PNCs can be significantly enhanced through polymer encapsulation, often accompanied by a decrease of photoluminescence quantum yield (PLQY) due to the loss of highly dynamic oleylamine/oleic acid (OLA/OA) ligands. Herein, we propose a solution for this problem by utilizing partially hydrolyzed poly(methyl methacryla...

A fluorometric clenbuterol immunoassay using sulfur and nitrogen doped carbon quantum dots.

A fluorometric clenbuterol immunoassay is described that uses S- and N-co-doped carbon quantum dots as the fluorescent probe. Strongly fluorescent S/N-doped carbon quantum dots (S/N-CDs) were synthesized by hydrothermal method using fructose as the carbon precursor and L-cysteine as S/N sources. The S/N-CDs were characterized by transmission electron microscopy, energy dispersive spectroscopy and Fourier transform infrared spectroscopy (FTIR). Under 350 nm photoexcitation, they display strong purple fluore...

Integration of Environmental Friendly Perovskites for High-efficiency White Light-emitting Diodes.

Perovskite quantum dots (QDs) have been widely used in white light-emitting diodes (WLEDs), due to their high quantum yield (QY), tunable bandgap, and simple preparation. However, the red-emitting perovskite QDs are usually containing iodine (I), which is not stable under continuous light irradiation. Herein, perovskite-based WLED is fabricated by lead-free bismuth (Bi)-doped inorganic perovskites CsSnCl and less-lead Mn-doped CsPbCl QDs, which emits white light with color coordinates of (0.334, 0.297). The...

Stable and Strong Emission CsPbBr Quantum Dots by Surface Engineering for High-Performance Optoelectronic Films.

We demonstrated complete surface passivation of CsPbBr quantum dots (QDs) by treatment with di-dodecyldimethylammonium bromide (DDAB) and sodium thiocyanate (NaSCN), resulting in dispersions with photostable photoluminescence of near-unity quantum yield (∼100%) as well as high carrier mobility of QDs' film. Br from DDAB and SCN from NaSCN passivated the bromine vacancies of the QDs to reduce the surface defect density and increase the stability. The QDs-passivated maintained the original photoluminescence...


Quick Search