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Effect of front surface light trapping structures on the PERC solar cell
摘要： Properties of the front textured surface shape and anti-reflection coating have a great impact on the performance of solar cells. In this paper, the simulation model of the minimum unit cell structure is established and validated, which is based on the framework of Silvaco software and basic parameters of the standard pyramid textures single crystalline silicon PERC solar cell. The effect of the front surface light trapping structures on cell performance is discussed. It is found that the slightly concave pyramid-like textures can improve the response for short wavelengths and the short-circuit current density of the cell is increased by 0.3 mA/cm2, which is improved by 0.80%. In addition, by properly controlling the preparation process of the anti-reflection coating, a gradient-index SiOxNy/Si3N4 double-layer anti-reflection coating (DLARC) can be formed, which can significantly reduce the reflectivity for short wavelengths. And the short-circuit current density of the cell can be increased by 0.32 mA/cm2, which is improved by 0.86%. Finally, the optimized slightly concave pyramid-like textures and the SiOxNy/Si3N4 DLARC can improve the photoelectric conversion efficiency of the PERC solar cell by 0.18% and 0.20%, respectively.
关键词： Texturing,PERC solar cell,Light trapping,Device simulation,Anti-reflection coating
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Wet-Chemically Textured Ultra-Thin GaAs Solar Cells with Dielectric/Metal Rear Mirrors
摘要： The rear-side contact layer of ultra-thin GaAs solar cells was textured using a simple, one-step wet chemical approach. A ZnS/Ag double layer was conformally deposited to function as a diffusive rear mirror. Local Ohmic contact points provided electrical contact directly to the Ag. The textured solar cells were compared with planar reference cells fabricated on the same wafer and a clear enhancement of long-wavelength quantum efficiency and short-circuit current was observed in the textured cells. Both architectures showed FF > 80% and VOC > 1 V. Additionally, the rear-side texture increases the external luminescent efficiency by enhancing outcoupling of luminescence.
关键词： light trapping,ultra-thin GaAs solar cells,dielectric mirror,wet etching
更新于2025-09-23 15:19:57
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Switchable Photocurrent Generation in an Ultra-thin Resonant Cavity Solar Cell
摘要： Fabry-Perot type resonant nanocavities allow for broadband enhancement of light absorption in ultra-thin absorber layers. By introducing a switchable mirror, these thin film structures can be used as unique optical devices enabling interesting applications with switchable absorption. We use a thin film photovoltaic layer stack based on an amorphous germanium absorber layer and combine it with a thin Mg/Pd mirror to create a switchable solar cell. In this work we demonstrate, how we can switch the light absorption and hence the photocurrent generation of the thin film solar cell by changing the refractive index of Mg, due to hydrogen absorption. Our results show, how optical resonances in the absorber can be switched “on / off” by the change of optical properties of the magnesium reflector. The multi-layer system can be switched from a light absorbing and photocurrent generating state to a transparent window state with excellent color neutrality. We emphasize our study as an important step towards the realization of switchable photovoltaic windows, which paves the way for larger scale building integrated photovoltaic applications.
关键词： Ultra-thin absorber,light trapping,photovoltaic,amorphous germanium,switchable magnesium mirror,smart window
更新于2025-09-23 15:19:57
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Non-resonant metal-oxide metasurfaces for efficient perovskite solar cells
摘要： The short-circuit current density and energy conversion efficiency of single-junction perovskite and perovskite/perovskite tandem solar cells can be increased by photon management. In this study, optical metasurfaces were investigated as potential light trapping structures oppose to commonly used pyramidal surface textures. Herein, metal oxide-based non-resonant metasurfaces were investigated as potential light-trapping structures in perovskite solar cells. The zinc oxide nanowire-based building blocks of the metasurface can be prepared by a templated electrodeposition through a mask of resist. The phase of the incident light can be controlled by the edge length of the subwavelength large zinc oxide nanowires. An array of zinc oxide nanowires was prepared and characterized in the current study. Three-dimensional (3D) finite-difference time-domain (FDTD) optical simulations were used to compare solar cells covered with non-resonant metasurfaces with commonly used light trapping structures. As compared to the solar cells covered with zinc oxide pyramid surface texture, solar cells with the integrated non-resonant metasurfaces exhibit almost identical quantum efficiencies and short-circuit current densities. Investigations of such metasurfaces will not only improve the photon absorption in perovskite solar cells but also reveal a pathway to make high-efficiency next-generation solar cells. Detailed guidelines for the realization of non-resonant metal oxide metasurfaces will be provided.
关键词： Light-trapping,Solar cell,Perovskite,Tandem,Metal oxides,Non-resonant metasurface
更新于2025-09-23 15:19:57
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Synthesis of SnSe quantum dots by successive ionic layer adsorption and reaction (SILAR) method for efficient solar cells applications
摘要： Quantum dots (QDs) are one of the promising materials in the development of third-generation photovoltaics. QDs have the advantage of multiple exciton generation (MEG), high absorption coefficient and tuneable bandgap, low cost and easy synthesis. The QDs act as analogues to dye molecules in QD sensitized solar cells (QDSSCs) when compared with traditional dye-sensitized solar cells (DSSCs). Extending the absorption range of quantum dots is one of potential solutions for enhancing photoconversion efficiencies. The sensitization of SnSe quantum dots on theTiO2 mesoporous layers is carried by a successive ionic layer adsorption and reaction (SILAR) method in a glove box. The advantages of SILAR method are a high loading rate and wide coverage of the TiO2 matrix by the quantum dots. The device has exhibited a photoconversion efficiency of 0.78% which is the known best among the SnSe quantum dot-based solar cells.
关键词： Solar cell,SILAR method,Photovoltaic efficiency,Sulphide-polysulphide,Light trapping,SnSe Quantum dots,QDSSC
更新于2025-09-23 15:19:57
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Self-assembled binary photonic crystals under the active confinement and their light trapping
摘要： The self-assembly of oppositely charged colloidal ellipsoids and spheres under the active con?nement is ?rstly proposed to achieve long-range ordered photonic crystals. Compared with the conventional passive con?nement, a characteristic of the active con?nement is that boundaries are movable. Our Brownian dynamics simulations show that dynamic steady structures, similar to quasi-2D colloidal crystals, can be obtained under the strong con?nement when the two boundaries periodically oscillate together. The in-plane structures can be regulated by changing the charge ratio of the two kinds of particles. These dynamic steady structures are determined by the minimum electrostatic energy with the aid of increased mobility of con?ned particles, which are not available in equilibrium. Numerical simulations verify that light can be perfectly con?ned in this dielectric binary photonic slab without any radiation, which corresponds to a typical optical bound state with divergent lifetime and ultrasharp spectral pro?le. Given the changeable geometry of this photonic slab, the trapped optical ?eld might be applicable to enhanced light-matter interactions. In addition, for thicker layers, layer-by-layer ordered structures occur spontaneously driven by the active con?nement, while no global order in the passive con?nement. Our results show that the boundary motion can become an important factor a?ecting self-assembled structure and function.
关键词： colloidal crystals,light trapping,active con?nement,photonic crystals,self-assembly
更新于2025-09-23 15:19:57
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Approaching the Yablonovitch limit with free-floating arrays of subwavelength trumpet non-imaging light concentrators driven by extraordinary low transmission
摘要： Metamaterials based on arrays of subwavelength dielectric structures has recently proved a viable research venue towards the realization of various photonic devices. In the current study we introduce a new approach towards efficient light trapping and the broadband absorption of the solar radiation based on silicon surface arrays composed of subwavelength trumpet non-imaging light concentrators (henceforth, trumpet arrays). In geometrical optics, a three-dimensional trumpet non-imaging light concentrator is a hyperboloid of revolution with an ideal light concentration ratio. We use finite-difference time-domain electromagnetic calculations to examine the optical response of an infinite cubic-tiled substrate-less silicon trumpet array under normal illumination. The absorptivity spectra of trumpet arrays are characterized by strong absorption peaks, some of which are just below the Yablonovitch limit. The enhanced light trapping is attributed solely to efficient occupation of the array Mie modes, and we show absorption enhancement at the near infrared that is an order of magnitude higher than that of optimized nanopillar (NP) arrays. We show superior broadband absorption of the solar radiation in trumpet arrays (with unoptimized geometry) compared with that of optimized NP arrays (~26% enhancement). The higher optical absorption in trumpet array is governed by low transmissivity, in contrast with NP array in which the absorption is governed by low reflectivity. Finally, we show that low reflectivity in trumpet arrays is governed by modal excitations at the upper part of the trumpets (which is also supported by the weak dependency of the reflectivity on the array height), whereas the transmissivity is governed by modal excitations at the lower part of the trumpets.
关键词： non-imaging light concentrators,Mie modes,nano-photonics,broadband absorption of solar radiation,light trapping
更新于2025-09-19 17:15:36
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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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Multiple embedded eigenstates in nonlocal plasmonic nanostructures
摘要： Trapping light in open cavities is a long sought “holy grail” of nanophotonics. Plasmonic materials may offer a unique opportunity in this context, as they may fully suppress the radiation loss and enable the observation of spatially localized light states with an infinite lifetime in an open system. Here, we investigate how the spatial dispersion effects, e.g., caused by the electron-electron interactions in a metal, affect the trapped eigenstates. Heuristically, one may expect that the repulsive-type electron-electron interactions should act against light localization, and thereby that they should have a negative impact on the formation of the embedded eigenstates. Surprisingly, here we find that the nonlocality of the material response creates new degrees of freedom and relaxes the requirements for the observation of trapped light. In particular, a zero-permittivity condition is no longer mandatory and the same resonator shell can potentially suppress the radiation loss at multiple frequencies.
关键词： spatial dispersion,nonlocal plasmonic nanostructures,light trapping,embedded eigenstates
更新于2025-09-19 17:13:59
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Influence of Perovskite Interface Morphology on the Photon Management in Perovskite/Silicon Tandem Solar Cells
摘要： Perovskite/silicon tandem solar cells are considered as one of the cost-effective solutions for determining high energy conversion efficiencies. Efficient photon management allows improving light incoupling in the solar cells by reducing optical losses. The optics relies upon the interface morphology, consequently, the growth mechanism of the top cell on the bottom cell is crucial for the implementation of efficient perovskite/silicon tandem solar cells. To describe the interface morphologies of perovskite/silicon tandem solar cells, a three-dimensional surface algorithm is used that allows investigating the perovskite solar cells deposited on the textured crystalline silicon solar cells. We distinguish between two extreme cases in which the film grows only in the direction of the substrate normal or in the direction of the local surface normal. The growth mode has a significant influence on the film roughness, the effective thickness of the film, the optics of the solar cell, and the photovoltaic parameters. The optics is investigated by finite-different time-domain simulations. The influence of the interface morphology on the photovoltaic parameters is discussed and guidelines are provided to reach high short-circuit current density and energy conversion efficiency.
关键词： photon management,light trapping,tandem solar cell,realistic interface morphology,Perovskite
更新于2025-09-19 17:13:59