Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.120
Publication date: 18th December 2023
This study demonstrates the disruptive potential of organic photoabsorbing blends in overcoming a critical limitation of metal oxide photoanodes: insufficient photogenerated current. Various organic blends, including PTB7-Th:FOIC, PTB7-Th:06T-4F, PM6:Y6, and PM6:FM, were systematically tested. When coupled with state-of-the-art electron transport layer (ETL) contacts, these blends exhibit exceptional charge separation and extraction, with PM6:Y6 achieving saturation photocurrents up to 17 mA/cm² at 1.23 VRHE (oxygen evolution thermodynamic potential). Employing a novel architecture, we highlight the remarkable attributes of PM6:Y6 blends, showcasing their ability to be fabricated as semitransparent organic photoanodes in tandem structures. The implementation in a double PM6:Y6 photoanode/photovoltaic structure resulted in photogenerated currents exceeding 7 mA/cm² at 0 VRHE (hydrogen evolution thermodynamic potential) and cathodic onset potentials as low as -0.5 VRHE.
To our knowledge, this work represents the first time a tandem structure utilizing organic photoanodes has been computationally designed and fabricated, achieving unprecedented performance levels for both the standalone photoanode and the tandem configuration. The structural design has been modeled using the transfer matrix method and experimentally tested, determining the optimal thickness of the first semitransparent light-absorbing element, the photoanode, to be 75 nm. This integrated approach holds promise for advancing the field of photoelectrochemical solar conversion to fuels and paves the way for further exploration of blend combinations and oxidative reactions targeting.
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