Topology Optimized Nanostrips for Electric Field Enhancements

Joakim Vester-Petersen, Rasmus E. Christiansen, Brian Julsgaard, Peter Balling, Ole Sigmund, Søren P. Madsen

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    Abstract

    This work addresses efficiency improvements of solar cells by manipulating the spectrum of sunlight to bettermatch the range of efficient current generation. The intrinsic transmission losses in crystalline silicon can effectivelybe reduced using photon upconversion in erbium ions in which low energy photons are converted to higher energy photons able to bridge the band gap energy and contribute the energy generation. The upconversion process in erbium is inefficient under the natural solar irradiation, and without any electric field enhancements of the incident light, the process is negligible for photo-voltaic applications. However, the probability for upconversion can be increased by focusing the incident light onto the erbium ions using optimized metal nanostructures[1, 2, 3].
    The aim of this work is to increase the photon upconversion yield by optimizing the design of metalic or dielectric nanostructures placed on top of an erbium doped thin film. To achieve this goal, topology optimization[4] isused to create 2D cross-sectional designs of nanostrips able to focus the incident light into the film. The infrared absorption band of erbium is sought utilized by optimizing for multiple excitation wavelengths while also including production inaccuracies directly within the optimization process[5]. The governing physics is modeled using Maxwell equations in a finite spatial domain truncated using periodic or scattering boundary conditions.
    Original languageEnglish
    Publication date2017
    Number of pages1
    Publication statusPublished - 2017
    Event2017 E-MRS Fall Meeting and Exhibit - Warsaw University of Technology, Warsaw, Poland
    Duration: 18 Sept 201721 Sept 2017

    Conference

    Conference2017 E-MRS Fall Meeting and Exhibit
    LocationWarsaw University of Technology
    Country/TerritoryPoland
    CityWarsaw
    Period18/09/201721/09/2017

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