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Diffraction-optimized aperiodic surface structures for enhanced current density in organic solar cells.

M Merkel, J Imbrock, C Denz

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    |October 19, 2022
    PubMed
    Summary
    This summary is machine-generated.

    Novel diffractive surface structures boost organic solar cell performance. Optimized Archimedean spiral patterns with Thue-Morse sequences achieved a 5% current density enhancement, improving solar energy conversion.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Nanotechnology

    Background:

    • Organic solar cells (OSCs) offer a promising renewable energy source.
    • Enhancing light absorption and charge carrier generation is crucial for OSC efficiency.
    • Diffractive optical elements can manipulate light propagation within solar cells.

    Purpose of the Study:

    • To design, evaluate, and optimize novel diffractive surface structures for OSCs.
    • To investigate the impact of different spiral patterns and sequence arrangements on light diffraction.
    • To achieve a significant increase in current density for improved OSC performance.

    Main Methods:

    • Fabrication of surface relief phase gratings with concentric rings, Fermat's spiral, and Archimedean spiral patterns.
    • Arrangement of grating pillars using periodic and deterministic aperiodic Thue-Morse and Rudin-Shapiro sequences.
    • Evaluation and optimization of various surface patterns to determine their effect on current density.

    Main Results:

    • Circularly symmetric diffraction patterns were achieved, enabling azimuthal angle-independent light diffraction.
    • The Thue-Morse sequence on an Archimedean spiral demonstrated significant potential.
    • A final current density enhancement of 5% was achieved for the optimized Thue-Morse/Archimedean spiral pattern.

    Conclusions:

    • Novel diffractive surface structures can effectively enhance current density in organic solar cells.
    • The choice of spiral pattern and sequence arrangement critically influences diffraction efficiency.
    • The Thue-Morse sequence on an Archimedean spiral represents a highly promising approach for future OSC development.