Publication date: 17th July 2025
Direct solar conversion of abundant reactants in photoelectrochemical devices offers a promising pathway for producing clean fuels and chemicals. Achieving high efficiency and long-term stability in these systems demands innovative strategies that build on advances in mature fields such as photovoltaics and electrocatalysis. This presentation highlights recent progress in integrating halide perovskite- and organic bulk heterojunction-based photovoltaic devices with electrocatalytic sheets to develop high-performance photoelectrodes for solar fuel and chemical production. For example, we demonstrate CsPbBr3-based photoanodes delivering stable photocurrents >6 mA cm⁻² at 1.23 V vs. RHE, and organic bulk heterojunction photoanodes (e.g., PM6/PTQ10 blends) achieving photocurrents of 25 mA cm-2 or over 5% unassisted solar-to-hydrogen efficiency in tandem configurations. Electrocatalytic sheets composed of carbon allotropes (graphite, glassy carbon, boron-doped diamond) and Ni- or NiFeOOH-based catalysts enable efficient oxygen evolution, while confined Pt catalysts support hydrogen evolution at photocathodes. Minimizing voltage losses and optimizing charge injection into electrolytes are critical to drive solar fuel and chemical production. Our characterization studies underscore key strengths of these devices, including strong solar absorption and substantial photovoltage generation, pointing to new opportunities for unassisted solar chemical synthesis.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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