Nanoscale aluminum concaves for light-trapping in organic thin-films

Goszczak, Arkadiusz Jarosław; Adam, Jost; Cielecki, Paweł Piotr; Fiutowski, Jacek; Rubahn, Horst‐Günter; Madsen, Morten

doi:10.1016/j.optcom.2016.02.021

Cited by 4 publications

(2 citation statements)

References 32 publications

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“…Here, reduction in reflectance was more pronounced for structures having a more random arrangement, rather than a periodic ordering. Recently we have also shown that Al concaves can result in plasmonic field enhancements over a broad wavelength range [52], which, though, depends very sensitively on details of the actual surface morphology such as slopes and ridges. The effect of a given imprinted structure on the reflectivity spectra is thus difficult to predict.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Absorption in Organic Thin-Films from Imprinted Concave Nanostructures

Goszczak

Rubahn

Madsen

2017

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In this work, a rapid, replicable method for imprinting concave nanostructures to be used as functional light-trapping nanostructures in organic thin-films is presented. Porous anodic alumina templates were fabricated both by anodization of thick Al foils and by anodization of submicrometer thin Al films evaporated via e-beam evaporation on Si substrates. The template formation leads to natural patterning of the underlying Al layers that are used as rigid masters for stamp fabrication, after selective etching of the porous anodic alumina. PDMS stamps were made after replicating the Al concave patterns and used for imprinting of spin coated photoresist on glass substrates. We have investigated semiperiodic and aperiodic imprinted large concave patterns fabricated from rigid masters after anodization of Al in H 3 PO 4 . We show that metal covered imprinted concaves show enhancement in absorption that is attributed to field enhancement and diffuse scattering, leading to efficient light trapping for a selected active layer material (P3HT:PCBM).

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Section: Resultsmentioning

confidence: 99%

Enhanced Absorption in Organic Thin-Films from Imprinted Concave Nanostructures

Goszczak

Rubahn

Madsen

2017

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“…The electrolytic oxidation of aluminum, defined as briefly eloxal, has been used commonly in the industrial world with various production methods [5]. The tailoring of the oxide layer's crystal morphologies and pore diameter, which are associated with those methods that the temperature [6], applied current, time [7], voltages [8] and electrolyte [8,9], play an essential role for manipulation of the coated surface [8,[10][11][12][13]. The microhardness of the surface oxide layer has lower flexibility.…”

Section: Introductionmentioning

confidence: 99%

The effect of the surface morphology of the aluminium oxide layer on the physical and bacterial attachment behavior

Kaya

Sarıbıyık

2023

Surf. Topogr.: Metrol. Prop.

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Coating of the metal surface for different fields such as corrosion resistance, hydrophobic surface, and conductivity properties enhance the material quality for different application. Furthermore, controlling the morphological structures and the size of the coating materials is one of the most important factors for designing their functionality. The new approaches to the effect of surface properties at the atomic level on bacterial adhesion offer new perspectives on this subject. In this study, the effect of the different current densities on the morphological microstructural features, micro hardness properties, and bacterial attachment behavior of the protective aluminum oxide layer was investigated by using different analytical and instrumental methods. The Staphylococcus aureus was used as a model bacteria for attachment tests. The result presented in the current study exhibited that the crystal morphology, hardness, and bacterial adhesion features have changed depending on the applied current density. The higher current density increases the surface roughness, hardness, and the size of the surface morphology and develops the bacterial attachment on the surface.

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