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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Tailored Disorder for the Light Management in Photovoltaics
摘要： Light management in photovoltaics continues to be an important ingredient when working towards high efficiency devices. Various approaches have been perceived. Besides spectral modification, e.g. based on up- or down-conversion, the spatial and angular redistribution of light is important. For the latter aspect, on which we concentrate here, various supporting photonic structures were suggested, e.g. photonic crystals, metallic nanostructures, or textured interfaces. From a higher executive perspective we can categorize most structures as being either periodic or random. The emergence of such material classes is explained by the fabrication means. The Fourier spectrum, i.e. the angular distribution with which photonic modes can be excited from such structures beyond specific near-field effects is either discrete and wavelength sensitive or unspecific and spectrally flat. Both combinations are far from optimum when integrating them into photovoltaic devices. In this contribution we elaborate on the notion of a tailored disorder to improve the photon management. With tailored disorder we achieve hyperuniform interfaces. They are characterized by a suppressed variation in the feature density across the interface, like in a periodic structure, but at the same they offer the same properties when viewed from different directions. The hyperuniform interfaces we have in mind combine the benefits of the previously considered categories. Hyperuniform interfaces offer (a) a structured Fourier spectrum, (b) are rather wavelength insensitive, and (c) are subject to a deterministic design process.
关键词： light management,hyperuniform interfaces,photovoltaics,tailored disorder
更新于2025-09-16 10:30:52
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Broadband Plasmonic Enhancement of High-Efficiency Dye-Sensitized Solar Cells by Incorporating Au@Ag@SiO <sub/>2</sub> Core–Shell Nanocuboids
摘要： The introduction of plasmonic additives is a promising approach to boost the efficiency of dye-sensitized solar cell (DSSC) since it may improve the light harvesting of a solar cell. Herein, we design broadband and strong plasmonic absorption Au@Ag@SiO2 nanocuboids (GSS NCs) as nanophotonic inclusions to achieve plasmon-enhanced DSSCs. These multiple resonances absorption arising from GSS NCs can be readily adjusted by altering their structures to complementarily match the absorption spectrum of the dyes, especially in weak absorption zones. By subtly regulating the position of nanophotonic inclusions in the photoanodes, not only the plasmonic near-field enhancement but also far-field light-scattering could be adequately developed to promote the light harvest and thus the efficiency of DSSCs. The resulting solar cells yield an average efficiency of 10.34%, with a champion value of 10.58%. The electromagnetic simulations are consistent with the experimental observations, further corroborating the synergistic effect of plasmonics improvement in these DSSCs.
关键词： near-field effect,light-scattering,light management,plasmon resonance,dye-sensitized solar cells
更新于2025-09-12 10:27:22
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Surpassing the 10% efficiency milestone for 1-cm2 all-polymer solar cells
摘要： Naphthalenediimide-based n-type polymeric semiconductors are extensively used for constructing high-performance all-polymer solar cells (all-PSCs). For such all-polymer systems, charge recombination can be reduced by using thinner active layers, yet suffering insufficient near-infrared light harvesting from the polymeric acceptor. Conversely, increasing the layer thickness overcomes the light harvesting issue, but at the cost of severe charge recombination effects. Here we demonstrate that to manage light propagation within all-PSCs, a thick bulk-heterojunction film of approximately 350 nm is needed to effectively enhance photo-harvesting in the near-infrared region. To overcome the severe charge recombination in such a thick film, a non-halogenic additive is used to induce a well-ordered micro-structure that inherently suppresses recombination loss. The combined strategies of light management and delicate morphology optimization lead to a promising efficiency over 10% for thick-film all-PSCs with active area of 1 cm2, showing great promise for future large-scale production and application of all-PSCs.
关键词： all-polymer solar cells,light management,naphthalenediimide,thick-film,morphology optimization
更新于2025-09-11 14:15:04
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Optical optimization of a multi-layer wideband anti-reflection coating using porous MgF2 for sub-micron-thick CIGS solar cells
摘要： The optical losses associated with sub-micron absorbers in CIGS solar cells can be reduced by light management techniques. 3-D optical modelling was used to optimize light in-coupling and internal rear reflectance in a 750-nm thick CIGS reference solar cell. At the front side, an effective medium approximation (EMA) approach for describing optical properties of a MgF2-based anti-reflection coating (ARC) was applied. Taking reflectance as the cost function and sequential nonlinear programming as the optimization algorithm, an optimal porous-on-compact double-layer ARC was determined. This led to a wideband light in-coupling with a 6.8% improvement in the photo-current density (Jph) with respect to the reference solar cell without ARC. Considering the variation of the sunlight direction due to day and seasonal changes, different light incidence angles were investigated. The results indicate that in this case, our designed double-layer ARC outperforms the standard compact MgF2 single-layer ARC. By using the EMA approach, the amount of computational memory can be reduced by a factor of 30, shortening the simulation time from four days to one hour. At the rear side of the cell, a point-contacted MgF2/Al2O3 reflector, in combination with our proposed front ARC, enhances the Jph by 11.3% considering the same reference solar cell. Compared to a much thicker cell (1600-nm thick absorber) with no light management applied, our front-and-rear optical approaches more-than-compensate optical losses resulting from using thinner absorbers. This design is suitable for industrial uptake and practical to realize. Additionally, the approach of using EMA for double-layer ARC optimization is innovative with respect to other ARC approaches applicable to not only chalcopyrite photovoltaic technologies.
关键词： Thin films,Antireflection coatings,Light management,Photovoltaic
更新于2025-09-10 09:29:36
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Broadband Light Management with Thermochromic Hydrogel Microparticles for Smart Windows
摘要： This article reports the intelligent control of solar gain through windows based on the tunable scattering behaviors of temperature-responsive hydrogel particles. High luminous transmittance and broadband solar transmittance modulation including unprecedented IR modulation are simultaneously achieved for the first time using co-polymerized pNIPA-AEMA microparticles with prescribed particle size and internal structure. The design strategy to maneuver the real part of refractive index is applicable for broader fields beyond energy-saving smart windows.
关键词： light management,smart windows,hydrogel microparticles,thermochromic,solar gain control
更新于2025-09-09 09:28:46