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    Diffractive optical elements (DOEs) offer dual functions for advanced solar cells. An experimental off-axis diffractive lens successfully demonstrated spectrum splitting and beam concentration for Vis-NIR solar light.

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    Area of Science:

    • Optics and Photonics
    • Renewable Energy Technologies
    • Materials Science

    Background:

    • Diffractive optical elements (DOEs) are gaining traction for third-generation photovoltaic (PV) cells.
    • Certain DOEs can perform simultaneous spectrum splitting and beam concentration (SSBC).

    Purpose of the Study:

    • To design and experimentally validate an off-axis diffractive lens for SSBC applications in solar energy.
    • To assess the lens's performance in spectral separation and light concentration for PV integration.

    Main Methods:

    • Design of an off-axis diffractive lens.
    • Experimental verification of the lens's SSBC capabilities.
    • Measurement of optical efficiency and spectral separation performance.

    Main Results:

    • The designed off-axis diffractive lens successfully achieved SSBC.
    • The lens separated the Vis-NIR solar spectrum into two bands.
    • An optical efficiency of approximately 70% was recorded with a low concentration factor.

    Conclusions:

    • The off-axis diffractive lens is a viable component for advanced solar energy systems.
    • Integration with lateral multijunction PV cells can lead to compact and effective solar systems.
    • This DOE technology shows promise for enhancing PV cell performance and efficiency.