A5044106296- solar cell performance optimization
- Silicon and Solar Cell Technologies
- Nanowire Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- Semiconductor Quantum Structures and Devices
- Photovoltaic System Optimization Techniques
- Advanced Frequency and Time Standards
- Advanced Fiber Laser Technologies
- Business Process Modeling and Analysis
- Thin-Film Transistor Technologies
- Geophysics and Sensor Technology
- Advanced Measurement and Metrology Techniques
- Multimedia Communication and Technology
- Model-Driven Software Engineering Techniques
- Optical Coatings and Gratings
- Migration, Aging, and Tourism Studies
- Aging, Elder Care, and Social Issues
- Real-time simulation and control systems
- Service-Oriented Architecture and Web Services
- IoT and Edge/Fog Computing
- Healthcare Technology and Patient Monitoring
- Solar Thermal and Photovoltaic Systems
- Simulation Techniques and Applications
- Photovoltaic Systems and Sustainability
- Atomic and Subatomic Physics Research
Max Planck Institute for Gravitational Physics
2023
Leibniz University Hannover
2023
Universidad Politécnica de Madrid
1996-2021
University of Cyprus
2019
IQE (United Kingdom)
2019
Oxford Photovoltaics (United Kingdom)
2019
Fraunhofer Institute for Solar Energy Systems
2019
IMDEA Energy Institute
2017
Universidad de Jaén
2016
Introduction: Social and healthcare organisations are facing significant challenges in rebuilding care services after the COVID-19 pandemic, which were already under pressure due to demographic changes, including ageing chronicity of population increased situations dependency. These generate an number hospital admissions, some cases longer stays a lack social support at home. Integrated health systems can be forefront providing better response these challenges, helping maintain people’s...
We investigated the fabrication of large-area (cm²) nanostructured glasses for solar cell modules with hydrophobic and hydrophilic properties using soft lithography colloidal lithography. Both these techniques entail low-cost ease nanofabrication. explored use simple 1D 2D nanopatterns (nanowires nanocones) effect introducing disorder in nanostructures. observed an increase transmitted light ordered nanostructures a maximum value 99% wavelengths >600 nm when nanocones are fabricated on two...
Abstract A GaInP/Ga(In)As/GaNAsSb/Ge 4J solar cell grown using the combined MOVPE + MBE method is presented. This structure used as a test bench to assess effects caused by integration of subcells and tunnel junctions into full structure. significant degradation Ge bottom subcell emitter observed during growth GaNAsSb subcell, with drop in carrier collection efficiency at high energy photon range that causes ~15% lower J sc V oc ~50 mV 1‐sun. The shown much ~140 No performance junctions, no...
This paper summarizes the state-of-the-art of lattice matched GaInP/Ga(In)As/Ge triple-junction solar cell developed at Solar Energy Institute UPM (IES-UPM). Different research topics tackled over last years about this structure are described. As result work, an efficiency ~ 40% <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\sim 415\times$</tex> is presented.
E-learning and its hybrid counterpart-B-learning-have become standard tools in higher education. The development of information communications technologies (ICTs) their application to education has made this possible. Among ICT technologies, the learning management system (LMS) been most important development. Teaching labs have also undergone a technological evolution, enabling them be used online while interacting closely with LMSs. This paper presents set procedures that ease integration...
To reach subpicometer sensitivities in the millihertz frequency range, inertial sensors based on laser interferometry must reduce laser-frequency noise, typically by using ultrastable optical reference cavities or atomic molecular references. This study presents a simpler solution: quasimonolithic Mach-Zehnder interferometer with intentionally mismatched arm lengths, plus two photodiodes at balanced output ports. Here structural stability is transferred to via amplification, integration, and...
Gallium phosphide (GaP) is an ideal candidate to implement a III-V nucleation layer on silicon substrate. The optimization of this has been pursued for decades, since it can form virtual substrate grow monolithically devices. In work we present GaP approach using standard MOVPE reactor with regular precursors. This design simplifies the epitaxial growth in comparison other routines reported, making manufacturing process converge industrial scale. short, our intends mimic what done...
Integration of GaP layers on silicon substrates using AsH3 pre-exposure followed by a PH3-based epitaxial growth allows the development very promising processes for photovoltaic industry, although many routines this approach suffer from reproducibility issues when transferred to new system, leading poor quality layers. This fact reveals lack knowledge mechanisms behind formation most common planar defects (stacking faults and microtwins) their dynamics GaP/Si Metal Organic Vapor Phase...
In order to get higher efficiencies in multijunction solar cells, a 1eV material lattice matched germanium has been searched tenaciously for years. this context, hybrid III-V/IV and single junction cells incorporating SiGeSn alloy are presented. A basic characterization of these which grown by CVD subsequent MOCVD, carried out.
A tandem GaAsP/SiGe solar cell has been developed employing group-IV reverse buffer layers grown on silicon substrates with a subsurface porous layer. Reverse facilitate reduction in the threading dislocation density limited thicknesses, but ease appearance of cracks, as observed previous designs regular Si substrates. In this new design, layer incorporated close to substrate surface. The ductility helps repress propagation diminishing problems low shunt resistance and thus improving...
This paper summarizes the current status of ALCHEMI project, a European collaborative undertaking under Solar-Era.Net co-fund scheme. The project’s aim is to develop novel, low cost, HCPV modules that operate at ∼1000 suns, and demonstrate DC module efficiency >37% Concentrator Standard Test Conditions (CSTC), manufacturing process will achieve costs <€0.9/Wp (<$1/Wp) in large volumes. Novel refractive optics have been designed manufactured, bespoke high concentration solar cell grid design...
Impact of annealing temperature, time and process gas on 1 eV GaNAsSb solar cells is assessed. In situ ex annealings are carried out in order to analyze their effect the cell performance. Ex as grown samples using N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> increase external quantum efficiency while H degrades Best performance obtained by a molecular beam epitaxy reactor. External increases short wavelength range (≤ 700 nm)...
A GaInP/Ga(In)As/GaNAsSb/Ge 4-junction solar cell grown using combined MOVPE+MBE growth is used to analyze the effects during integration of subcell components into full 4J structure. In this preliminary study, Ge observed suffer about 15% Jsc drop and ~50 mV Vocloss at 1-sun, while Voc GaNAsSb drops by as much − 140 mV. The degradation subcells in current-matched structure can hinder its efficiency potential a higher extent than GaInP/Ga(In)As/Ge 3J. Besides, high quality would still limit...
Project ALCHEMI is a Solar Era.Net funded European collaborative project, which developing low cost, high efficiency HCPV module using previous design developed by Fullsun PV. In this the 625 sun Gen 1 has been redesigned to operate at 1000 suns and further improved utilization of state art 3 junction solar cells from three different vendors. Through use ∼42% efficient cells, it expected achieve efficiencies >37%. This paper describes cell test assembly process initial evaluation how next...
To achieve sub-picometer sensitivities in the millihertz band, laser interferometric inertial sensors rely on some form of reduction frequency noise, typically by locking to a stable reference, such as narrow-linewidth resonance an ultra-stable optical cavity or atomic molecular transition. In this paper we report compact stabilization technique based unequal-arm Mach-Zehnder interferometer that is sub-nanometer at $10\,\mu$Hz, $0.5\,$mHz, and reaches noise floor...