Listar por tema "quantum dots"
Mostrando ítems 1-18 de 18
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Auger Recombination Suppression in Nanocrystals with Asymmetric Electron–Hole Confinement
WILEY-VCH Verlag (2012)Type II and quasi-type II nanocrystals with thick shells exhibit reduced blinking. However, after a number of monolayers, the influence of the shell thickness is found to vanish. Using a two-band Kane Hamiltonian, it is ... -
Beyond universal volume scaling: tailoring two-photon absorption in nanomaterials by heterostructure design
ACS Publications (American Chemical Society) (2023-07-28)Colloidal semiconductor nanomaterials present broadband, with large cross-section, two-photon absorption (2PA) spectra, which turn them into an important platform for applications that benefit from a high nonlinear optical ... -
Boosting Power Conversion Efficiencies of Quantum-Dot-Sensitized Solar Cells Beyond 8% by Recombination Control
American Chemical Society (2015)At present, quantum-dot-sensitized solar cells (QDSCs) still exhibit moderate power conversion efficiency (with record efficiency of 6–7%), limited primarily by charge recombination. Therefore, suppressing recombination ... -
Chemi-Structural Stabilization of Formamidinium Lead Iodide Perovskite by Using Embedded Quantum Dots
American Chemical Society (2020-01-6)The approaches to stabilize the perovskite structure of formamidinium lead iodide (FAPI) commonly result in a blue shift of the band gap, which limits the maximum photoconversion efficiency. Here, we report the use of PbS ... -
Coulomb interaction signatures in self-assembled lateral quantum dot molecules
American Physical Society (2013)We use photoluminescence spectroscopy to investigate the ground state of single self-assembled InGaAs lateral quantum dot molecules. We apply a voltage along the growth direction that allows us to control the total ... -
Current Challenges in the Development of Quantum Dot Sensitized Solar Cells
Wiley (2020-07)Quantum dot sensitized solar cells (QDSSCs) have experienced a continuous performance growth in the past years presenting a photoconversion efficiency > 13%. QDSSCs constitute a smart approach to take advantage of the ... -
Deciphering the Role of Quantum Dots Size in the Ultrafast Charge Carrier Dynamics at the Perovskite-Quantum Dots Interface
Royal Society of Chemistry (2020-09)Understanding the behaviour of electrons and holes (e, h) diffusion and transfer at the interfaces of photoexcited hybrid materials at different densities of photoexcited charge carriers is paramount to the development of ... -
Effect of the electrophoretic deposition of Au NPs in the performance CdS QDs sensitized solar cells
Elsevier (2016)Solution-processed mesoscopic oxide semiconductor-based materials offer potentially low-cost and high stability alternative for next generation of solar cells, and metallic nanoparticles had shown to be a good alternative ... -
Electronic structure of quantum dots: response to the environment and externally applied fields
Universitat Jaume I (2016-09-06)En esta Tesis Doctoral se han estudiado teóricamente las propiedades electrónicas y ópticas de electrones y huecos confinados en puntos cuánticos semiconductores mediante el uso del método k·p dentro de las aproximaciones ... -
Fabrication by Laser Irradiation in a Continuous Flow Jet of Carbon Quantum Dots for Fluorescence Imaging
American Chemical Society (2018)Fluorescent carbon quantum dots (CQDs) are synthesized by laser irradiation of carbon glassy particles suspended in polyethylene glycol 200 by two methods, a batch and a flow jet configuration. The flow jet configuration ... -
High Quality Inkjet Printed-Emissive Nanocrystalline Perovskite CsPbBr3 Layers for Color Conversion Layer and LEDs Applications
Wiley (2022)Metal halide perovskites (MHPs) have shown outstanding optical emissive properties and can be employed in several optoelectronics devices. In contrast with materials of well-established technologies, which are prone to ... -
Impact of core-shell perovskite nanocrystals for LED applications: successes, challenges, and prospects
The Royal Society of Chemistry (2023-07-24)Perovskite nanocrystals (PeNCs) synthesized by colloidal solution methods are an outstanding case of study due to their remarkable optical features, different from their bulk counterpart, such as a tuneable band gap and ... -
PbS quantum dots as additives in methylammonium halide perovskite solar cells: the effect of quantum dot capping
Royal Society of Chemistry (2019-09)Colloidal PbS quantum dots (QDs) have been successfully employed as additives in halide perovskite solar cells (PSCs) acting as nucleation centers in the perovskite crystallization process. For this strategy, the surface ... -
Quantum Dot Based Heterostructures for Unassisted Photoelectrochemical Hydrogen Generation
Wiley (2013-02)TiO2 hollow nanowires (HNWs) and nanoparticles (NPs) constitute promising architectures for QDs sensitized photoanodes for H2 generation. We sensitize these structures with CdS/CdSe quantum dots by two different methods ... -
Recombination in Quantum Dot Sensitized Solar Cells
American Chemical Society (2009-11)Quantum dot sensitized solar cells (QDSCs) have attracted significant attention as promising third-generation photovoltaic devices. In the form of quantum dots (QDs), the semiconductor sensitizers have very useful and often ... -
Síntesis one-pot y propiedades fotoluminiscentes de nanocristales semiconductores II-VI dopados con europio (III)
Universitat Jaume I (2012-06-08)Esta tesis doctoral, que lleva por título: “Síntesis one-pot y propiedades fotoluminiscentes de nanocristales semiconductores II-VI dopados con europio (III)", se enmarca dentro del campo de la nanofotónica, al centrarse ... -
Synthesis of Anisotropic CdSe/CdS Dot-in-Giant-Rod Nanocrystals with Persistent Blue-Shifted Biexciton Emission
American Chemical Society (2018)Anisotropic single-phase wurtzite CdSe/CdS nanocrystals were synthesized by colloidal chemistry, introducing ZnCl2 to increase the shell growth in the radial direction. As a result, dot-in-giant-rod nanocrystals were ... -
Two Biexciton Types Coexisting in Coupled Quantum Dot Molecules
American Chemical Society (2023)Coupled colloidal quantum dot molecules (CQDMs) are an emerging class of nanomaterials, manifesting two coupled emission centers and thus introducing additional degrees of freedom for designing quantum-dot-based technologies. ...