Dr. Aimi Abass Profile

Dr. Aimi Abass

Sr Staff Engineer at ams-OSRAM International GmbH

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Publications (5)

Proceedings Article | 5 October 2023 Presentation

Green µLEDs beamed emission using resonant modes in plasmonic metasurfaces

Mohamed Abdelkhalik, Aleksande Vaskin, Toni López, Anton Matthijs Berghuis, Aimi Abass, Jaime Gómez Rivas

Proceedings Volume PC12648, PC1264819 (2023) https://doi.org/10.1117/12.2676472

KEYWORDS: Aluminum, Quantum wells, Quantum plasmonics, Solids, Quantum emitters, Near field, Nanoparticles, Nanolithography, Indium gallium nitride, Simulations

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Proceedings Article | 6 June 2023 Presentation + Paper

Light beaming and outcoupling enhancement from quantum wells with Al metasurfaces

Mohamed Abdelkhalik, Aleksandr Vaskin, Toni López, Anton Matthijs Berghuis, Aimi Abass, Jaime Gómez Rivas

Proceedings Volume 12568, 125680H (2023) https://doi.org/10.1117/12.2667971

KEYWORDS: Light emitting diodes, Quantum enhancement, Semiconducting wafers, Quantum wells, Gallium nitride, Nanoparticles

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Proceedings Article | 15 March 2023 Poster + Paper

Enhanced light emission collection from InGaN quantum wells using plasmonic metasurfaces

Mohamed Abdelkhalik, Aleksandr Vaskin, Aimi Abass, Toni López, Jaime Gómez Rivas

Proceedings Volume 12431, 124310H (2023) https://doi.org/10.1117/12.2654623

KEYWORDS: Quantum wells, Indium gallium nitride, Quantum plasmonics, Quantum enhancement, Quantum light, Light emitting diodes, Semiconducting wafers

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Proceedings Article | 17 September 2018 Presentation

Second-harmonic generation by 3D ABC-laminate meta-crystals (Conference Presentation)

Andreas Wickberg, Aimi Abass, Hui-Hsin Hsiao, Carsten Rockstuhl, Martin Wegener

Proceedings Volume 10719, 107191K (2018) https://doi.org/10.1117/12.2317934

KEYWORDS: Second-harmonic generation, Metamaterials, Dielectrics, Polymers, Photonic crystals, Glasses

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Proceedings Article | 23 May 2018 Presentation

Strategy for tailoring nanospheres for rough interfaces in solar cells (Conference Presentation)

Stefan Nanz, Aimi Abass, Peter Piechulla, Alexander Sprafke, Ralf Wehrspohn, Carsten Rockstuhl

Proceedings Volume 10688, 106880R (2018) https://doi.org/10.1117/12.2315800

KEYWORDS: Light scattering, Scattering, Diffraction, Solar cells, Interfaces, Thin films, Thin film solar cells, Crystals, Crystallography, Silicon

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The availability of optimum textures for the purpose of light trapping in solar cells is at stake. Here, we discuss how they can be obtained with a large-area scalable bottom-up approach that utilizes as a template monolayers of densely packed nanospheres from a colloidal solution with tailored size distribution. Theoretically, we show that the surface textures' geometry can be predicted and tuned from a colloidal solution with given nanosphere sizes and relative occurrence probability. With only simple monolayers comprised of two nanosphere size species, we show that one can already obtain a useful scattering pattern relevant for rear scattering light trapping textures. We proceeded to study the application of such textures in thin-film crystalline silicon (c-Si) solar cells. Such monolayers can be tuned to provide diffraction patterns, which form an annulus in Fourier space such that stronger scattering occurs at oblique angles. For such two species nanosphere monolayers, the nanosphere sizes dominantly influence the diffraction efficiency and minimum and maximum scattering angles. The relative occurrence probability of each nanopshere species influences the amount of diffraction states accessible, which translates to how broad the annulus region in Fourier space can be. The simplicity of the monolayer and the behavior of the scattering response allows to easily estimate nanosphere size ranges of interest by considering the radiation condition in c-Si and in air. In optimizing the monolayer parameters to obtain optimum rear scattering light trapping textures, we inspect approaches that avoid the severe computational costs, which typically follow the modeling of random scattering geometries. In particular, we investigate the applicability of utilizing the surface texture's Power Spectral Density (PSD) and alternatively rigorous diffraction calculations in a semi-infinite c-Si superstrate to deduce net short-circuit current enhancement dependence on the monolayer parameters. The widely used PSD based prediction is shown to significantly deviate in important parameter ranges, where an optimal response can be obtained. This is related to the limitation of the PSD to be used as a predictor for the scattering response at textures with a notable height modulation. In the regime where the PSD fails to be predictive, an excellent prediction on the short-circuit current enhancement can be obtained with minimal computational costs by only examining the diffraction efficiencies in a selected wavelength range where light trapping has its largest impact. We show that the integrated diffraction in the directions of interest at the wavelength of 700 nm is sufficiently representative for the considered 1 μm thin-film c-Si cell and light trapping scheme. Fullwave simulations reveal that the integrated diffraction at 700 nm and the short-circuit current have coinciding trends in their dependency on the nanosphere size distribution. We furthermore explore the usage of the nanosphere monolayer template to obtain front surface textures, which provide mainly anti-reflection properties. This is done by considering an inverse pattern of the template to make use of the needle-like structures that emerge from the inverted nanosphere monolayer. The conditions needed for the monolayer parameters in order to ensure broadband suppression of reflection are discussed.

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