A5000705707- Silicon and Solar Cell Technologies
- Semiconductor materials and interfaces
- Gold and Silver Nanoparticles Synthesis and Applications
- Thin-Film Transistor Technologies
- Plasmonic and Surface Plasmon Research
- Quantum Dots Synthesis And Properties
- Nanowire Synthesis and Applications
- Diverse Industrial Engineering Technologies
- Chalcogenide Semiconductor Thin Films
- 2D Materials and Applications
- solar cell performance optimization
- Optical Coatings and Gratings
- Perovskite Materials and Applications
- ZnO doping and properties
- Electric Power Systems and Control
- MXene and MAX Phase Materials
- Electrochemical sensors and biosensors
- Organic Light-Emitting Diodes Research
- Electrochemical Analysis and Applications
- Advanced biosensing and bioanalysis techniques
- Analytical Chemistry and Sensors
- Conducting polymers and applications
- Thermal Radiation and Cooling Technologies
- Material Properties and Applications
- Semiconductor Quantum Structures and Devices
Universidad Politécnica de Madrid
2021-2024
Universidad Autónoma de Madrid
2017-2021
In this work we report on the characterization and biological functionalization of 2D MoS
The effect of the oxidation gallium nanoparticles (Ga NPs) on their plasmonic properties is investigated. Discrete dipole approximation has been used to study wavelength out-of-plane localized surface plasmon resonance in hemispherical Ga NPs, deposited silicon substrates, with oxide shell (Ga2O3) different thickness. Thermal treatments, varying temperature and time, were carried out order increase experimentally Ga2O3 thickness NPs. optical, structural chemical oxidized NPs have studied by...
2D monolayer molybdenum disulphide (MoS2) has been the focus of intense research due to its direct bandgap compared with indirect bulk counterpart; however photoluminescence (PL) intensity is limited low absorption efficiency. Herein, we use gallium hemispherical nanoparticles (Ga NPs) deposited by thermal evaporation on top chemical vapour MoS2 monolayers in order enhance luminescence. The influence NP radius and laser wavelength reported PL Raman experiments. In addition, physics behind...
Abstract Plasmonic gallium (Ga) nanoparticles (NPs) are well known to exhibit good performance in numerous applications such as surface enhanced fluorescence and Raman spectroscopy or biosensing. However, reach the optimal optical performance, strength of localized plasmon resonances (LSPRs) must be particularly by suitable narrowing NP size distribution among other factors. With this purpose, our last work demonstrated production hexagonal ordered arrays Ga NPs using templates aluminium...
New methods for the production of colloidal Ga nanoparticles (GaNPs) are introduced based on evaporation gallium expendable aluminum zinc oxide (AZO) layer. The can be prepared in aqueous or organic solvents such as tetrahydrofuran order to used different sensing applications. particles had a quasi mono-modal distribution with diameters ranging from 10 nm 80 nm, and their aggregation status depended solvent nature. Compared common chemical synthesis, our method assures higher yield...
Core-shell gallium nanoparticles (Ga NPs) have recently been proposed as an ultraviolet plasmonic material for different applications but only at room temperature. Here, the thermal stability a function of size NPs is reported over wide range temperatures. We analyze chemical and structural properties oxide shell by x-ray photoelectron spectroscopy atomic force microscopy. demonstrate inverse dependence breaking temperature with NPs. Spectroscopic ellipsometry used tracking rupture its...
In this work, we use Joule-effect thermal evaporation to produce hybrid structures made of Ga and nanoparticles (NPs) on Si (100) substrates. Taking advantage the protective oxide shell, NPs can be used as a template for second deposition step without structural changes, enabling hybridization materials. These complex mixed present spectrally broad plasmonic absorption that optically tuned with wide range photon energies from UV IR regions full width at half maximum ∼400 800 nm. The results...
Abstract Plasmonics has emerged as an attractive field driving the development of optical systems in order to control and exploit light–matter interactions. The increasing interest around plasmonic is pushing research alternative materials, spreading operability range from IR UV. Within this context, gallium appears ideal candidate, potentially active within a broad spectral (UV–VIS–IR), whose properties are scarcely reported. Importantly, smart design materials requires their...
Ordered porous anodic alumina has become a popular template for the nanopatterning of different materials due to its ease manufacturing. However, an aluminium nanopatterned obtained after removing not been widely used despite it maintains hexagonal periodicity. In this work, we use that deposit gallium nanoparticles (NPs) by thermal evaporation, resulting in highly ordered arrays spherical-like NPs. The size and shape NPs are investigated scanning electron microscopy order best match...
Experimental evidence indicating the beneficial impact of a phosphorous diffusion gettering (PDG) in reduction trapping centers is shown, as observed by means inductively coupled photoconductance (PC) decay and lifetime measurements carried out on upgraded metallurgical-grade silicon (UMG-Si) wafers. The presence species dominating long time range PC UMG material (slow traps), which effectively removed after PDG conducted at 780 Celsius, detected. Notwithstanding, second mechanism,...
Abstract Gallium nanoparticles (Ga NPs) are attracting increasing attention because of their appealing physical‐chemical properties. In particular, mechanical properties play a key role in the implementation these core‐shell structures on certain applications, such as soft and stretchable electronics. Thus, efforts being addressed to modulate them mainly by chemical means. contrast, this study investigates how outer gallium thin oxide shell change when its thickness is increased through...
Plasmonic Ga nanoparticles (NPs) were thermally oxidized at low temperature in order to increase the native Ga<sub>2</sub>O<sub>3</sub> shell thickness and improve their stability during chemical functionalization. The optical, structural properties of NPs have been studied by spectroscopic ellipsometry, scanning electron microscopy, grazing incidence X-ray diffraction photoelectron spectroscopy. A clear redshift peak wavelength is observed with increasing annealing time due increase, barely...
Upgraded Metallurgical-Grade (UMG) silicon (Si) has raised interest as an alternative material for solar cells due to its low cost, environmental impact and CAPEX. Maximum cell efficiencies similar those obtained with high purity poly-Si have been reported. However, a higher defect density the compensated doping character result in UMG-based varying over wider ranges frequency distribution charts. Developing methods precisely identify impurities active field of work many years. Among others,...
The integration of nanostructures on top solar cells has been previously demonstrated as an effective method to increase the collection efficiency by coupling sunlight. In this work, approach is implemented using core-shell gallium nanoparticles (Ga-NPs) functional light scatterers III-V cells, investigating how Ga-NPs affect their photovoltaic performance. effect studied in GaAs and GaAsSbN superlattice-based with different bandgaps for a wide range sizes. After NP size optimization,...
GaAsSb/GaAsN superlattices (SL) outperform GaAsSbN bulk material in solar cells but still suffer from imperfections. This work studies the presence of unintentional doping different structures by means a Mott-Schottky analysis. The SL structure is found to reduce 40% with respect material, correlating increased performance.
In article number 2100141, Catalán-Gómez, Vázquez and co-workers perform the modulation of mechanical properties core-shell structure gallium nanoparticles by thermal oxidation processes. The study is carried out single-particle indentations atomic force microscopy over a wide range nanoparticle radius. It found that shell stiffness increases up to 50 times while Young's modulus does not change significantly.
Upgraded metallurgical-grade (UMG) Si is obtained via a purification route alternative to the one used for conventional polysilicon and with significantly reduced environmental impact. Additionally, despite lower purity level in feedstock than polysilicon, UMG-Si has demonstrated potential fabrication of highly efficient low-cost solar cells. Low initial bulk carrier lifetimes recorded bare wafers can be improved by means an adequate Phosphorus Diffusion Gettering (PDG) process mc-Si. In...