SMuK 2023 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 5: Measurement Techniques and Simulations
UP 5.4: Vortrag
Mittwoch, 22. März 2023, 16:45–17:00, MOL/0213
Simulated outdoor efficiency and performance ratio of a III-V-on-Si solar panel for direct solar hydrogen production — •Johannes Grabenstein1,2, Moritz Kölbach3, Matthias M May3, Klaus Pfeilsticker1, and Kira Rehfeld1,2 — 1Institut für Umweltphysik, Universität Heidelberg, Germany — 2Geo- und Umweltforschungszentrum, Universität Tübingen, Germany — 3Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Germany
Tandem solar cells might play a substantial role in future energy systems and in negative emission technologies, both for electricity- and direct hydrogen generation. In a tandem solar cell, photocurrent mismatch between the absorber layers due to variation in the spectral irradiance distribution induces efficiency losses. Together with the temperature-related efficiency modulation, this effect gives rise to its sensitivity to climatic conditions. Here, the performance of an AlGaAs-on-Si tandem solar cell that is either used for electricity production or directly connected to an anion exchange membrane electrolyzer is evaluated for different locations on earth using numerical modeling. The ratio between the outdoor harvesting efficiency and efficiency at standard conditions [1] lies within 0.86 and 0.95 for electricity- and within 0.91 and 0.95 for hydrogen production. This study allows to improve performance predictions and highlights how tuning the top absorber band gap to the prevailing spectral irradiance composition can enhance the harvesting efficiency, depending on the location. [1] Kölbach et al., Sustainable Energy Fuels, 2022, 6 DOI:10.1039/D2SE00561A