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[IEEE 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) - Waikoloa Village, HI, USA (2018.6.10-2018.6.15)] 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC) - Mitigating optical losses in crystalline silicon thin-film solar cells on glass
摘要： Liquid phase crystallized silicon thin-film solar cells on glass provide efficiencies up to 14.2 %. While open-circuit voltage and fill factor are already comparable to wafer-based devices, short-circuit current density is reduced due to incomplete light absorption. This paper analyzes the losses of current device designs in experiment and one-dimensional simulations, revealing the low absorber thickness of 15-20 μm as well as the planar glass-silicon interface as the main cause of non-absorption. Interface textures, in particular a sinusoidal texture and a smooth anti-reflective three-dimensional (SMART) texture, are discussed concerning their potential to mitigate these losses, allowing to reduce losses at the glass-silicon interface by at least 40% relative. Taking the electronic interface quality into account, the SMART texture is identified as the most promising texture for light management in liquid phase crystallized silicon thin-film solar cells on glass.
关键词： light management,thin-film solar cells,absorption enhancement,silicon
更新于2025-10-22 19:40:53
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Light management in crystalline silicon thin-film solar cells with imprint-textured glass superstrate
摘要： The implementation of light management textures in thin-film solar cells often simultaneously causes an undesired deterioration of electronic performance. Here, we introduce a simple yet effective technique for improved light management in liquid phase crystallized silicon thin-film solar cells on glass. By imprinting pyramidal textures on the sun-facing side of the glass superstrate, absorber and functional layers of the device remain unaffected while light in-coupling is significantly increased. An increase of short-circuit current density by 2.5 mA cm2 was observed by texturing the glass in this way, corresponding to an enhanced power conversion efficiency from 12.9% to 13.8%. Optical simulations allow to attribute the increase in equal shares to an anti-reflective effect at the air-glass interface as well as light scattering and multiple passes through the glass. The technology allows for independent optimization of optical performance without compromising on electronic material issues and is therefore useable for any other solar cell technology using a glass superstrate.
关键词： Light management,Nano-imprint lithography,Liquid phase crystallization,Thin-film solar cells,Silicon
更新于2025-10-22 19:40:53
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[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic, Czech Republic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - The Calculation of Energy Saving in use Light Management Systems
摘要： Light management systems are increasingly used in interior and exterior lighting. These systems offer many benefits for users of lighting. One of the most important advantages of these systems is the possibility of saving energy consumption for lighting purposes. Before deciding to use a lighting management system, it is worth knowing what value of savings energy this system will bring in specific case. The article present results of measurements basic light and electric parameters of LED luminaires with the possibility of controlling via DALI signal and obtained on base these measurements characteristic power control. Presented the method of calculating potential energy savings based on the received measurement results. Sources of differences between simulation calculations and real savings in using energy. The article present the differences between the evaluation of savings energy consumption simulation in the DIALUX program and real values. On the example of an existing lighting control system installed in sample room.
关键词： Light Management Systems,power control characteristics of LED luminaires,LED luminaires
更新于2025-09-23 15:21:21
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Nanomolded buried light-scattering (BLiS) back-reflectors using dielectric nanoparticles for light harvesting in thin-film silicon solar cells
摘要： The article presents a nanoparticle-based buried light-scattering (BLiS) back-re?ector design realized through a simpli?ed nanofabrication technique for the purpose of light-management in solar cells. The BLiS structure consists of a ?at silver back-re?ector with an overlying light-scattering bilayer which is made of a TiO2 dielectric nanoparticles layer with micron-sized inverted pyramidal cavities, buried under a ?at-topped silicon nanoparticles layer. The optical properties of this BLiS back-re?ector show high broadband and wide angular distribution of diffuse light-scattering. The ef?cient light-scattering by the buried inverted pyramid back-re?ector is shown to effectively improve the short-circuit-current density and ef?ciency of the overlying n-i-p amorphous silicon solar cells up to 14% and 17.5%, respectively, compared to the reference ?at solar cells. A layer of TiO2 nanoparticles with exposed inverted pyramid microstructures shows equivalent light scattering but poor ?ll factors in the solar cells, indicating that the overlying smooth growth interface in the BLiS back-re?ector helps to maintain a good ?ll factor. The study demonstrates the advantage of spatial separation of the light-trapping and the semiconductor growth layers in the photovoltaic back-re?ector without sacri?cing the optical bene?t.
关键词： light management,nanomolding,inverted pyramids,thin-?lm solar cells,nanoparticles,photovoltaics
更新于2025-09-23 15:19:57
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Opal-Like Photonic Structuring of Perovskite Solar Cells Using a Genetic Algorithm Approach
摘要： Light management is an important area of photovoltaic research, but little is known about it in perovskite solar cells. The present work numerically studies the positive effect of structuring the photo-active layer of perovskite material. This structuration consists of a hybrid absorbing layer made of an uniform part and an opal-like part. A genetic algorithm approach allows us to determine the optimal combination among more than 1.4 × 109 potential combinations. The optimal combination provides an internal quantum efficiency of 98.1%, nearly 2% higher than for an equivalent unstructured photo-active layer. The robustness of the optimum against potential experimental deviations, as well as the angular dependency of the proposed structure, are examined in the present study.
关键词： photonic crystals,perovskite,photovoltaics,light management
更新于2025-09-23 15:19:57
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Photocurrent improvement of an ultra-thin silicon solar cell using the localized surface plasmonic effect of clustering nanoparticles
摘要： The cluster-shaped plasmonic nanostructures are used to manage the incident light inside an ultra-thin silicon solar cell. Here, for the first time, spherical, conical, pyramidal, and cylindrical nanoparticles as a form of a cluster in the rear side of a thin silicon cell are simulated using finite difference time domain (FDTD) method. By calculating the optical absorption and hence the photocurrent, it is shown that the clustering of nanoparticles significantly improves them. The photocurrent enhancement is the result of the plasmonic effects of clustering the nanoparticles. For more comparison, at first, a cell with a single nanoparticle at the rear side is evaluated. Then four smaller nanoparticles are put around it to make a cluster. The photocurrents of 20.478, 23.186, 21.427, and 21.243 mA/cm2 are obtained for the cells using clustering conical, spherical, pyramidal, cylindrical NPs at the backside, respectively. These values are 13.987, 16.901, 16.507, 17.926 mA/cm2 for the cell with one conical, spherical, pyramidal, cylindrical nanoparticle at the rear side, respectively. So, clustering significantly improves the photocurrents. Finally, the distribution of the electric field and the generation rate for the proposed structures are calculated.
关键词： Clustering NPs,Localized surface plasmon resonance,light management,FDTD,Photocurrent,Plasmonic solar cell
更新于2025-09-23 15:19:57
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Light Management in Monolithic Perovskite/Silicon Tandem Solar Cells
摘要： Perovskite/silicon tandem solar cells (TSCs), especially 2-terminal, with record efficiency of 28% already been realized, have presented great potentials to be low-cost and efficient substitutes for dominant silicon photovoltaics. It is quite realistic to achieve efficiencies exceeding 30%, which have been indicated by extensive optical simulations. Super light management in monolithic perovskite/silicon TSCs is one of the prerequisites to make it a reality. In this review, various forms of optical losses, such as reflection loss, parasitic absorption and current mismatch, are analyzed systematically to provide better understanding of the performance of perovskite/silicon TSCs. Particularly, a simple refractive index matching rule derived from the Fresnel equation is proposed as a basis of material selection and device design. Meanwhile, an overview of current strategies and challenges in monolithic perovskite/silicon TSCs is highlighted, comprising of bandgap engineering of perovskites and light trapping methods, aiming to provide guidance for further improvement of the tandem devices.
关键词： anti-reflection,light management,parasitic absorption,light trapping,current matching,monolithic perovskite/silicon tandem solar cells
更新于2025-09-19 17:13:59
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Resonant Metagratings for Spectral and Angular Control of Light for Colored Rooftop Photovoltaics
摘要： We design semi-transparent metagrating supercells that enable control over the spectrum and directivity of incident light for applications in photovoltaics with tailored angular appearance. The building block of the supercells is a 110-120 nm wide and 175 nm tall silicon nanowire that shows a strong Mie resonance around λ= 650 nm. By arranging the resonant Mie scatterers into metagratings of increasing pitch (675-1300 nm) we create a Lambertian-like scattering distribution over an angular range of choice. The millimeter-sized metasurfaces were fabricated using electron beam lithography and reactive ion etching. The fabricated metasurface nearly fully suppress specular reflection on resonance while 10% of the incoming light around the resonance is scattered into the angular range between 30-75°, creating a bright red appearance over this specific range of angles. Off-resonant light in the blue, green and near-infrared is efficiently transmitted through the metasurface and absorbed in the underlying photovoltaic cell. The implemented silicon heterojunction solar cells with integrated metagrating supercells show a reduction in external quantum efficiency matching the resonant scattering spectral range. The short circuit current is reduced by 13% due to the combined effects of resonant scattering, reflection from the high-index substrate and absorption in the Si nanowires. In addition, to efficient colorful photovoltaics with tailored angular appearance, the metagrating concept can find application in many other light management designs for photovoltaics and other opto-electronic devices.
关键词： light management,metasurface,Mie resonators,BIPV,silicon nanoparticles,colored photovoltaics,transparent metagratings,solar cells
更新于2025-09-19 17:13:59
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A monolithic nanostructured-perovskite/silicon tandem solar cell: feasibility of light management through geometry and materials selection
摘要： The use of several layers of different materials, taking advantage of their complementary bandgap energies, improves the absorption in multi-junction solar cells. Unfortunately, the inherent efficiency increment of this strategy has a limitation: each interface introduces optical losses. In this paper, we study the effects of materials and geometry in the optical performance of a nanostructured hybrid perovskite – silicon tandem solar cell. our proposed design increases the performance of both subcells by managing light towards the active layer, as well as by minimizing reflections losses in the interfaces. We sweep both refractive index and thickness of the transport layers and the dielectric spacer composing the metasurface, obtaining a range of these parameters for the proper operation of the device. Using these values, we obtain a reduction in the optical losses, in particular they are more than a 33% lower than those of a planar cell, mainly due to a reduction of the reflectivity in the device. This approach leads to an enhancement in the optical response, widens the possibilities for the manufacturers to use different materials, and allows wide geometrical tolerances.
关键词： light management,silicon,perovskite,tandem solar cell,nanostructure,optical losses
更新于2025-09-19 17:13:59
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Semitransparent Perovskite Solar Cells for Smart Windows
摘要： Smart windows, whose transparency can be tuned dynamically and even reversibly changed from transparent to opaque, have been the focus of research since the 1970s [1]. For one thing, smart windows can control the transmission of sunlight into the building, achieving energy savings by balancing the cooling load with the energy requirements of lighting and heating. For another, opaque glass walls act like curtains to protect privacy. The existence of smart windows reduces dependence on manual intervention, and motivates people's lives to become intelligent. The electrochromic windows, whose color can be reversibly changed by applying a small external electric field, have been investigated for use on Boeing 787 Dreamliner airplane [2]. The electrochromic windows are undoubtedly effective, but lack of advantages in inconsistent light-shielding, long-term non-durability and high cost. Thermochromic windows, whose color can be switched by the application of local temperature, have been also investigated. However, such technologies have limitations in impractical high-temperature heating conditions and relatively low light-dark contrast. Besides, the above-mentioned smart windows require external source of energy, thereby failing to achieve the purpose of saving energy. If the photoelectric conversion of solar cells and intelligent control of light transmission are tactfully combined in smart windows, the situation will be changed qualitatively [3]. To date, semitransparent photovoltaics have been proven to be used in power generation windows that provide power output, shading and even heat insulation effect [4, 5], but rarely referring to color switch characteristics. Therefore, it is highly desirable to integrate both functions composed of color-adjustment and power-generation to develop semitransparent photovoltaics as smart windows.
关键词： Semitransparent Perovskite Solar Cells,Light Management,Bandgap Tuning,Device Color,Smart Windows
更新于2025-09-19 17:13:59