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Cdse Quantum Dot - DOAJ

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Last Updated: 28 April 2022

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Coherent Exciton Dynamics in Ensembles of Size-Dispersed CdSe Quantum Dot Dimers Probed via Ultrafast Spectroscopy: A Quantum Computational Study

Interdote quantum dots dimers' consistent excitonic dynamics in nanometric colloidal CdSe quantum dots dimers lead to interdote charge migration and energy transfer. Despite the inevitable intrinsic size dispersion of colloidal QDs, we show by electronic quantum dynamical simulations that the interdot coherent response to ultrashort fs laser pulses can be characterized by pump-probe absorption spectroscopy. The coherence of excitons in QD dimers that result in interdot charge migration can be observed in fs pump-probe, four-wave mixing, or covariance spectroscopy, according to the ensemble's computed pump-probe transient absorption maps averaged over the ensemble, and could be observed in fs pump-probe, four-wave mixing, or covariance spectroscopy.

Source link: https://doi.org/10.3390/app10041328


Fabrication, Characterization, and Optimization of CdS and CdSe Quantum Dot-Sensitized Solar Cells with Quantum Dots Prepared by Successive Ionic Layer Adsorption and Reaction

The study of determining the optimal preparation conditions that could produce the best solar cell results was carried out by quantum dot-sensitized solar cells in CdS and CdSe. In this way, the QDs are encouraged to grow TiO2 by dipping the TiO2 electrode in two separate solutions for predetermined times. The CdS-based QDSSC showed the highest results when the QDs were made from precursor solutions with the content of 0. 10 M per person using 4 dipping cycles with the dipping time of 5 minutes in each case.

Source link: https://doi.org/10.1155/2014/939423


Performance Enhancement of CdS/CdSe Quantum Dot-Sensitized Solar Cells with (001)-Oriented Anatase TiO2 Nanosheets Photoanode

Two types of TiO2 photoanodes, namely nanosheets and nanoparticles, were produced on Abstract CdS/CdSe quantum dot-sensitized solar cells. The TiO2 NSs with high-exposed facets were produced by a hydrothermal process, while the TiO2 nanoparticles used the commercial Degussa P-25.

Source link: https://doi.org/10.1186/s11671-018-2842-5


Band Tunable CdSe Quantum Dot-Doped Metals for Quantum Dot-Sensitized Solar Cell Application

Quantum dots are gaining a lot of attention as a precursor to the next-generation solar cells due to the high absorption coefficient, tunable band gap, and multiple exciton generation effects. We have succeeded in manufacturing the quantum dot solar cells with high conversion yield based on CdSe:X nanocrystal by successive ionic layer absorption and reaction in search of a more effective way to raise the power conversion effectiveness of quantum dot-sensitized solar cells. This research is helpful in determining the conduction band and valence band rates of CdSe:X nanoparticles.

Source link: https://doi.org/10.1155/2019/9812719


Sulforaphane Protects the Liver against CdSe Quantum Dot-Induced Cytotoxicity.

The potential cytotoxicity of cadmium selenide quantum dots is a barrier to their use in biomedical imaging or as diagnostic and therapeutic agents. This research details the effects of SFN on immortalized human hepatocytes and mouse livers. During short term exposure, SFN initiated a pro-oxidant reaction characterized by depletion of intracellular reduced glutathione, up-regulation of antioxidant enzymes and autophagy, as well as depletion of glutathione during short term exposure, which was followed by a spike in antioxidant enzymes and glutathione levels at 24 h. The Nrf2 pathway, according to a Nrf2 knockdown of Nrf2, may have played a role in Nrf2's defense against CdSe QD-induced cell death. SFN-induced autophagy inhibition by Wortmannin significantly reduced the protective effect of SFN on CdSe QD-induced cell death, according to Wortmannin. In addition, the role of autophagy in SFN defense against CdSe QD-induced cell death was discovered using mouse embryonic fibroblasts lacking ATG5.

Source link: https://doi.org/10.1371/journal.pone.0138771


La Doping of CdS for Enhanced CdS/CdSe Quantum Dot Cosensitized Solar Cells

The CdS/CdSe system of quantum dot cosensitized solar cells is one of the most cost-effective solar cells due to its ability of level adjustment. By means of the successive ionic layer adsorption and reaction, we present an innovative solution for the rare earth materials La-doped of the CdS layer in the CdS/CdSe QDCSCs. In CdS film, we discovered that La doped quantum dots could help more electrons accumulate in the Fermi film, which causes the Fermi level to rise and form a stepped structure. Our latest efforts are aimed at increasing the efficiencies of quantum dot sensitized solar cells.

Source link: https://doi.org/10.1155/2015/710140


Performance Study of CdS/Co-Doped-CdSe Quantum Dot Sensitized Solar Cells

We used a multilayer adsorption and reaction technique to dope CdSe's production of CdS/CodSe QDSCs made with CdS/Coped-CdSe solar cells, including photoanode, Pt counter electrode, and sulfide/polysulfide electrolyte.

Source link: https://doi.org/10.1155/2014/818160


A Suitable Polysulfide Electrolyte for CdSe Quantum Dot-Sensitized Solar Cells

Under the light of 100 mW/cm2 white light, the QDSSC with CdSe sensitized electrode prepared using 7 cycles of successive ionic layer adsorption and reaction yields a 1. 4 percent yield in ethanol/water at 1. 4 percent. Inclusion of a small amount of TiO2 nanoparticles into the electrolyte helps to stabilize the polysulfide electrolyte and thus increase the CdSe QDSSC's stability. The CdSe QDs have also been found to be stable in the optimized polysulfide liquid electrolyte.

Source link: https://doi.org/10.1155/2013/942139


Effect of ligand exchange on photocurrent enhancement in cadmium selenide (CdSe) quantum dot water splitting cells

Exemplary photocatalytic properties were shown in comparison to pure CdSe PEC cells in a shorter ligand exchange. In the bulk CdSe film, the photocurrent also arises from an increase in charge transport by ligand exchange to shorter EDT ligands, with OA ligands suppressing carrier diffusion from TiO2 to CdSe.

Source link: https://doi.org/10.1016/j.rinp.2018.08.036

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions