A5011564032- solar cell performance optimization
- Advanced optical system design
- Chalcogenide Semiconductor Thin Films
- Advanced Optical Imaging Technologies
- Optical Coatings and Gratings
- Silicon and Solar Cell Technologies
- Semiconductor Lasers and Optical Devices
- Thin-Film Transistor Technologies
- Solar Thermal and Photovoltaic Systems
- Photonic and Optical Devices
- Hydraulic Fracturing and Reservoir Analysis
- Adaptive optics and wavefront sensing
- Electrowetting and Microfluidic Technologies
- Quantum Dots Synthesis And Properties
- Advanced Measurement and Metrology Techniques
- Photovoltaic System Optimization Techniques
- Seismic Imaging and Inversion Techniques
- Reservoir Engineering and Simulation Methods
- Manufacturing Process and Optimization
- Liquid Crystal Research Advancements
- Semiconductor Quantum Structures and Devices
- Advanced Numerical Analysis Techniques
- Drilling and Well Engineering
- TiO2 Photocatalysis and Solar Cells
- Optical Wireless Communication Technologies
Universidad Politécnica de Madrid
2009-2015
Universitat Politècnica de Catalunya
2009
Centre National de la Recherche Scientifique
2006
Université d'Orléans
2006
In order to achieve competitive system costs in mass-production, it is essential that CPV concentrators incorporate sufficient manufacturing tolerances. This paper presents an advanced concentrator optic comprising a Fresnel lens and refractive secondary element, both with broken rotational symmetry, producing the desired light concentration high tolerance (high acceptance angle) as well excellent homogenization by Köhler integration. compares conventional Fresnel-based concentrators.
The Concentrated Photovoltaics (CPV) promise relies upon the use of high-efficiency triple-junction solar cells (with proven efficiencies over 44%) and high-performance optics that allow for high concentration concurrent with relaxed manufacturing tolerances (all key elements low-cost mass production).Additionally, uniform illumination is highly desirable efficiency reliability reasons.All these features have to be achieved inexpensive containing only a few (in general no more than 2)...
Concentration photovoltaic (CPV) systems might produce quite uneven irradiance distributions (both on their level and spectral distribution) the solar cell. This effect can be even more evident when CPV system is slightly off-axis, since they are often designed to assure good uniformity only at normal incidence. The non-uniformities both in absolute content produced by systems, originate electrical losses multi-junction cells (MJSC). works focused integration of ray-tracing methods for...
Most cost-effective concentrated photovoltaics (CPV) systems are based on an optical train comprising two stages, the first being a Fresnel lens. Among them, Fresnel-Köhler (FK) concentrator stands out owing to both performance and practical reasons. We describe experimental measurements procedure for FK modules. This includes three main types of measurements: electrical efficiency, acceptance angle, irradiance uniformity at solar cell plane. have collected here features different prototypes...
Getting a lower energy cost has always been challenge for concentrated photovoltaic. The FK concentrator enhances the performance (efficiency, acceptance angle and manufacturing tolerances) of conventional CPV system based on Fresnel primary stage secondary lens, while keeping its simplicity potentially low‐cost manufacturing. At same time F‐XTP (Fresnel lens+reflective prism), at first glance better potential but significantly higher sensitivity to errors. This work presents comparison...
We present novel advanced optical designs with a dramatically smaller display to eye distance, excellent image quality and large field of view (FOV). This enables headsets be much more compact, typically occupying about fourth the volume conventional headset same FOV. The design strategy these optics is based on multichannel approach, which reduces distance from size itself. Unlike microlens arrays, are also devices, our use freeform surfaces produce imaging in entire view, even when...
Non-uniform irradiance patterns over Multi-Junction Cells gives rise to power losses, especially when considering spectral distributions different junctions.Thermal effects on Silicone-on-Glass lenses affect distributions.A new Photovoltaic Concentrator (CPV), formed by nine optical channels, each one with a Kohler configuration, has been designed overcome these at high concentrations for large acceptance angle.A Fresnel Lens Variable Focal Point is proposed prevent crosstalk in multichannel...
It is essential to obtain high values of tolerance for PV concentrators because manufacturing process always implies some accuracy errors. In this way, three new free-form are presented here, combining geometric concentration and (high acceptance angle). This achieved by using the SMS3D design method, which most advanced method surfaces in non-imaging optics. Uniform illuminance on cell important as well, proper behavior durability system, so our designs will have homogenizer elements. We...
Modules are an important part of the CPV system. By pursing, in our objective a 35% efficiency module, we need to look forward significant improvement state art modules since no commercial module is capable achieving that efficiency. Achieving this will require high cells, progress optics lenses implemented these modules, and also integration into module. Basic design presented considering for practical rapid industry application. The output 385 W while its weight only 18 kg. In spite...
Manufacturing tolerances, along with a high concentration ratio, are key issues in order to obtain cheap CPV systems for mass production. Consequently, this manuscript presents novel tolerant and cost effective concentrator optic: the domed-shaped Fresnel-Köhler, presenting curved Fresnel lens as Primary Optical Element (POE). This is based on two previous successful designs: FK concentrator, flat lens, dome-shaped system developed by Daido Steel, resulting superior concentrator. The shows...
In order to have a cost-effective CPV system, two key issues must be ensured: high concentration factor and tolerance. The novel concentrator we are presenting, the dome-shaped Fresnel-Köhler, can widely fulfill these other essential in module. This is based on previous successful designs: FK with flat Fresnel lens system developed by Daido Steel, resulting superior concentrator. has shown outstanding simulation results, achieving an effective concentration-acceptance product (CAP) value of...
In present commercial Virtual Reality (VR) headsets the resolution perceived is still limited, since VR pixel density (typically 10-15 pixels/deg) well below what human eye can resolve (60 pixels/deg). We here novel advanced optical design approaches that dramatically increase of keeping large FoV required in applications. This approach be applied to a vast number architectures, including some configurations, as multichannel designs. All this done at stage, and no tracker needed headset.
We present novel ultracompact advanced optical designs for VR HMD’s with a large field of view (> 90 deg) based on multi-channel freeform optics an excellent image quality designed adapted to the human vision.
Compacting devices is an increasingly demanding requirement for many applications in both nonimaging and imaging optics. "Compacting" means here decreasing the volume of space between entry exit aperture without optical performance. For systems, compact optics mainly important reducing cost. Its small less material needed mass-production size light weight save cost transportation. addition to mentioned advantages, increases portability as well, which contributes a lot wearable display...
Non-uniform irradiance patterns created by Concentrated Photovoltaics (CPV) concentrators over Multi-Junction Cells (MJC) can originate significant power losses, especially when there are different spectral distributions the MJC junctions. This fact has an increased importance considering recent advances in 4 and 5 junction cells. The affected with thermal effects on Silicone-on-Glass (SoG) CPV systems. work presents a new optical design, 9-fold Fresnel Köhler concentrator, prepared to...
The outdoor measurements of a single-cell concentrator PV module reaching regressed 35.6% efficiency and maximum peak 36.0% (both corrected @T<sub>cell</sub>=25ºC) are presented. This is the result joint effort by LPI Solar Junction to demonstrate potential combining their respective state-of-the-art optics solar cells. used an FK, which advanced nonimaging using 4-channel Köhler homogenization, with primary Fresnel lens refractive secondary made glass. Junction's cell triplejunction...
Concentration Photovoltaics (CPV) is one of the most promising areas for competitive solar electricity production. This promise relies upon use high-efficiency triple-junction cells (which already have proven efficiencies over 41%) and advanced optics designs, which allow high concentration concurrent with manufacturing tolerances, both key elements low cost mass In this paper we will present progress in development CPV optical designs at present. These are based on free-form using Köhler...
The FK concentrator has demonstrated during the last years that compares very well with other Fresnel-based optics for CPV. There are several features provide high performance: (1) optical efficiency; (2) large tolerance to tracking misalignment and manufacturing errors, thanks a CAP (Concentration-Acceptance Product); (3) good irradiance uniformity low chromatic dispersion on cell surface. Non-uniformities in terms of absolute spectral content produced by conventional CPV systems can...
Manufacturing technologies as injection molding or embossing specify their production limits for minimum radii of the vertices draft angle demolding, instance. In some demanding nonimaging applications, these restrictions may limit system optical efficiency affect generation undesired artifacts on illumination pattern. A novel manufacturing concept is presented here, in which surfaces are not obtained from usual revolution symmetry with respect to a central axis (z axis), but they calculated...
An advanced CPV concentrator with a Fresnel primary and refractive secondary produces both high concentration tolerance an excellent light homogenization. It compares well conventional Fresnel-based from optical cost standpoints.
It is essential to obtain high values of tolerance for CPV concentrators because manufacturing process always implies some accuracy errors. This paper presents the Fresnel Köhler concentrator (FK), an advanced optical comprising a lens as primary element and refractive secondary element, both presenting free-form surfaces. optic produces both, desired light concentration (i.e. acceptance angle), well excellent homogenization by integration simultaneously. A comparison between FK other...
We present an advanced optical design for a high-resolution ultra-compact VR headset high-end applications based on multichannel freeform optics and 4 OLED WUXGA microdisplays developed under EU project LOMID [1]. Conventional systems in headsets require large distance between lenses displays that directly leads to the rather bulky heavy commercial we have at present. managed dramatically decrease required display size itself eye distance, making it only 36 mm (to be compared 60-75 most...