Embossed Mie resonator arrays composed of compacted TiO2 nanoparticles for broadband anti-reflection in solar cells

Visser, Dennis; Chen, Ding-Yuan; Désières, Y.; Ravishankar, Ajith P.; Anand, Srinivasan

doi:10.1038/s41598-020-69518-6

Cited by 18 publications

(19 citation statements)

References 50 publications

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“…Pressure thermal NIL 48 prepared TiO2 Mie resonators on Si and glass substrates from a colloidal dispersion of anatase and rutile TiO2 NPs (~ 50 nm in diameter). First, a drop of the suspension was dispersed on the substrate surface and then the PDMS mold was pressed down at 100 g/cm 2 and at 100 °C until the NPs solution was dried out.…”

Section: 1mentioning

confidence: 99%

“…A final stabilization at 140 °C for 10 min yielded gold-based patterns with the following dimensions: width 750 nm, pitch 4 μm for microwires, diameter 4.5 μm, pitch 8 μm for microholes, and width 2 μm and pitch 8 μm for microdot structures. More recently, Visser et al 48 prepared TiO 2 Mie resonators on Si and glass substrates from a colloidal dispersion of anatase and rutile TiO 2 NPs (∼50 nm in diameter). First, the PDMS mold was brought into contact with a droplet of the later solution of dispersed NPs on the substrate and pressed at 100 g/cm 2 and at 100 °C until the NPs solution was dried out.…”

Section: Thermal Nilmentioning

confidence: 99%

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Nanoimprint Lithography Processing of Inorganic-Based Materials

et al. 2021

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We review past and recent progress in Nano-Imprint Lithography (NIL) methods to (nano-) structure inorganic materials from sol-gel liquid formulations and colloidal suspensions onto a surface. This technique, first inspired by embossing techniques, was developed for soft polymer processing, as final or intermediate materials, but is today fully adapted to hard inorganic materials with high dielectric constant, such as metal oxides, with countless chemical compositions provided by the sol-gel chemistry. Consequently, NIL has become a versatile, high throughput, and highly precise microfabrication method that is mature for lab developments and scaling up. We first describe the state-of-the-art in nanofabrication methods and the plethora of approaches developed in the last decades to imprint metal oxides from inorganic solutions. These are discussed and compared in terms of performances, issues, and ease of implementation. The final part is devoted to relevant applications in domains of interest. Generalities on Nano fabrication techniques and NILFrom the early ages, technics to cut, sculpt, etch, mold, assemble pieces of matter have been developed and constantly optimized to satisfy the growing demand for functional materials. Since the inception of nanotechnology, these operations have to be mastered at the nanoscale. For these tasks, many top-down and bottom-up methods exist. However, they do not simultaneously fulfill all the necessary criteria of performance such as spatial resolution, pattern complexity, hierarchy, scalability, dimensionality, costeffectiveness, a span of processable materials. Thus, motivations to optimize them and develop new ones persist as a flourishing domain of research and development.Many materials exhibiting various intrinsic properties (mechanical, chemical, electrical, optical, thermal, etc.) are exploited in numberless functions once nanostructured onto a surface. Amongst them, metal oxides are extremely valuable for their extreme chemical, mechanical and thermal stability and range of physicalchemical properties. Thanks to its hardness, chemical inertness, transparency and low background fluorescence, glass is one of the preferred choices for micro-and nano-fluidics device fabrication. In photonics, metasurfaces require optical properties that are found in dielectrics such as SiO2 often combined with high index dielectric TiO2 or (plasmonic) gold 1 . For nano-electronics, silica remains one of the key

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Section: 1mentioning

confidence: 99%

Section: Thermal Nilmentioning

confidence: 99%

Nanoimprint Lithography Processing of Inorganic-Based Materials

et al. 2021

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“…These new strategies, such as e‐beam lithography and the template‐assisted assembly method, enable the nanofabrication of metasurfaces. [ 134,138 ] Recently, efforts have been undertaken to develop TiO 2 metasurfaces as color filters for emitter enhancement and reflection coatings on existing architectures, especially solar cells. [ 131,138,139 ]…”

Section: Manipulation Of the Scattering Characteristicsmentioning

confidence: 99%

“…[ 134,138 ] Recently, efforts have been undertaken to develop TiO 2 metasurfaces as color filters for emitter enhancement and reflection coatings on existing architectures, especially solar cells. [ 131,138,139 ]…”

Section: Manipulation Of the Scattering Characteristicsmentioning

confidence: 99%

Resonant Scattering Manipulation of Dielectric Nanoparticles

Zhang

et al. 2021

Advanced Optical Materials

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The concentration and manipulation of light in the nanoscale range are fundamental to nanophotonic research. Plasmonic nanoparticles can localize electromagnetic waves within subdiffraction volumes, but they also undergo large Joule losses and inevitable thermal heating. Subwavelength dielectric nanoparticles have emerged as a new class of photonic building blocks that enhance light–matter interactions within nanometric volumes. These nanoparticles exhibit strong electric and magnetic responses with negligible energy dissipation. In recent decades, the design of efficient dielectric nanoresonators has seen tremendous progress. In this review, recent theoretical and experimental advances in characterizing the optical properties of dielectric nanoparticles, from resonant single‐particle scattering characteristics to multimodal interference in complex particle assemblies, are discussed. Specific attention is paid to novel strategies employed to manipulate far‐field Mie‐type scattering, enhance local electromagnetic field, and boost magnetic resonance, as well as ultimately achieve Fano‐like resonance, unidirectional scattering (Kerker conditions), and photon waveguide. A collection of emerging applications of dielectric nanoparticles is also highlighted and the fundamental prospects of designing all‐dielectric/metallic–dielectric photonic nanostructures are considered, particularly those of functional dielectric materials and all‐dielectric 3D assemblies.

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“…Different strategies have been adopted to reduce the reflectance 28 , 29 , and increase the absorption efficiency 30 , 31 , and the short-circuit current density , delivered by thin-film solar cells 16 , 32 – 34 . Our approach increases the optical path of light within the active layer to generate more charge carriers.…”

Section: Introductionmentioning

confidence: 99%

Resonant nano-dimer metasurface for ultra-thin a-Si:H solar cells

Elshorbagy

Sánchez

Cuadrado

et al. 2021

Sci Rep

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Low-cost hydrogenated amorphous silicon solar cells (a-Si:H) can perform better and be more competitive by including nanostructures. An optimized nano-dimer structure embedded in close contact with the back electrode of an aSi:H ultra-thin solar cells can enhance the deliverable short-circuit current up to 27.5 %. This enhancement is the result of an increase in the absorption at the active layer, that is the product of an efficient scattering from the nanostructure. From our calculations, the nano-dimer structure must be made out of a high-index of refraction material, like GaP. The evaluation of the scattering and absorption cross section of the structure supports the calculated enhancement in short-circuit current, that is always accompanied by a decrease in the total reflectance of the cell, which is reduced by about 50 %.

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Embossed Mie resonator arrays composed of compacted TiO2 nanoparticles for broadband anti-reflection in solar cells

Cited by 18 publications

References 50 publications

Nanoimprint Lithography Processing of Inorganic-Based Materials

Nanoimprint Lithography Processing of Inorganic-Based Materials

Resonant Scattering Manipulation of Dielectric Nanoparticles

Resonant nano-dimer metasurface for ultra-thin a-Si:H solar cells

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